This is a supplement to Doescher's "Living and Fossil Brachiopod Genera 1775(c)1979, Lists and Bibliography"(c)

A Legrand(c)Blain, 1968 [un(c)named]
Aalenirhynchia Shi and Grant, 1993:57
Aberia Melou, 1990:549
Abichia Askerov, 1964; 1965; 1967 [nomina nuda]
Aboriginella Koneva, 1983, in Koneva and Popov, 1983:121 
Abrekia Dagys, 1974:98
Absenticosta Lazarev, 1991:58
Abyssorhynchia Zezina, 1980:16
Abyssothyris Thomson, 1927:190
Acambona White, 1865:27
Acanthalosia Waterhouse, 1986:31
Acanthambonia Cooper, 1956:212
Acanthatia Muir(c)Wood and Cooper, 1960:158
Acanthobasiliola Zezina, 1981:11
Acanthocosta Roberts, 1971:104
Acanthocrania Williams, 1943:71
Acanthoglypha Williams and Curry, 1985:257
Acanthoplecta Muir(c)Wood and Cooper, 1960:171
Acanthoproductus Martynova, 1970:59
Acanthorhynchia Buckman, 1914 [nomen nudum]; 1918:69
Acanthorthis Neuman, 1977:22
Acanthospira Weller, 1914 [replaced by Acanthospirina]
Acanthospirifer Menakova, 1964:34
Acanthospirina Schuchert and LeVene, 1929:119 [new name for Acanthospira]
Acanthothiris Orbigny, 1850:323
Acanthothyris Bronn, 1862; Paetel, 1875 [misspelling of Acanthothiris]
Acanthothyropsis Kamyschan, 1973, in Kamyschan and Babanova, 1973:64
Acanthotoechia Williams and Curry, 1985:244
Acareorthis Roberts, 1990, in Roberts and Jell, 1990:268
Acculina Misius, 1977, in Misius and Ushatinskaia, 1977:113
Achunoproductus Ustritsky, 1971:21
Acidotocarena Liu, 1979:507
Acolosia Cooper and Grant, 1976:2051
Acosarina Cooper and Grant, 1969:2
Acrites Davidson and King, 1874 [misspelling of Acritis]
Acritis Volborth, 1869 [=Aulonotreta]
Acritosia Cooper and Grant, 1969:5
Acrobelesia Cooper, 1983:247
Acrobrochus Cooper, 1983:248
Acrosaccus Willard, 1928:259 [=Schizotreta]
Acrospirifer Helmbrecht and Wedekind, 1923:952
Acrothele Linnarsson, 1876:21
Acrothyra Matthew, 1901:303
Acrothyris Hou, 1963:419
Acrotreta Kutorga, 1848:275
Acrotretella Ireland, 1961:1140
Actinoconchus McCoy, 1844:149
Actinomena Opik, 1930:166
Acuminothyris Roberts, 1963:15
Acutatheca Stainbrook, 1945:55
Acutella Ljaschenko, 1973:119
Acutilineolus Amsden, 1978:31 [subgenus of Eospirifer]
Acutoria Cooper and Dutro, 1982:100
Adairia Gordon, Henry, and Treworgy, 1993:20
Adaptatrypa Struve, 1980:412
Adectorhynchus Henry and Gordon, 1985:36
Adensu Popov and Rukavischnikova, 1986:58
Adiagraphma Xian, 1980 [nomen nudum] 
Adiaphragma Xian, 1978:299
Adminiculoria Waterhouse and Gupta, 1979:133
Admixtella Rozman, 1978:84
Admodorugosus Brunton, Mundy and Lazarev, 1993:111
Adnatida Richardson, 1991:38
Adolfia Gurich, 1909:137
Adolfispirifer Krylova, 1962:75
Adrenia Chatterton, 1973:126
Adriana Gregorio, 1930:29
Advenina Sandy, 1986:187
Adygella Dagys, 1959:25
Adygelloides Dagys, 1959:28
Adygellopsis Sun and Shi, 1985, in Jin, Wang, Sun, and Shi, 1985:228
Aegiria Opik, 1933:55
Aegiromena Havlicek, 1961:450
Aegironetes Havlicek, 1967:46
Aemula Steinich, 1968:193
Aenigmastricklandia Ziegler, 1966:347'(0*„(„(∞∞'åAenigmastrophia Boucot, 1971:156
Aenigmathyris Cooper, 1971:F2
Aequspiriferina Yang and Yin, 1962, in Yang et al., 1962:110
Aerothyris Allan, 1939:245
Aesopomum Havlicek, 1965:293
Aetheia Thomson, 1915:389
Aethirhynchia Shi, 1990:314
Afghanispira Dagys, 1968 [nomen nudum]
Afghanospirifer Plodowski, 1968:255
Afilasma Stehli, 1961:460
Agalatassia Popov and Holmer, 1994:51
Agarhyncha Havlicek, 1982:369
Agastapleura Xu, 1978:211
Agelesia Cooper and Grant, 1969:6
Agerinella Pajaud and Patrulius, 1965:582
Agerithyris Radulovic, 1991:24
Agramatia Sokolskaja, 1948:39
Agulhasia King, 1871:109
Agyrekia Koneva, 1979:60
Ahtiella Opik, 1932:37
Aidynkulirhynchia Ovtsharenko, 1983:59
Aikarhyncha Havlicek, 1990:212
Airtonia Cope, 1934:275
Ajukuzella Ovtsharenko, 1977 [nomen nudum]
Ajukuzella Ovtsharenko, 1983:165
Akatchania Klets, 1988, in Abramov and Grigorjewa, 1988:135
Akelina Severgina, 1967:133
Akmolina Popov and Holmer, 1994:125
Akopovorhynchia Smirnova, 1990:47
Aksarinaia Koneva, 1992:92
Aktassia Popov, 1976, in Nazarov and Popov, 1976:37
Ala Nalivkin, 1979:135
Alabushevothyris Smirnova, 1994:41
Alaskospira Kirk and Amsden, 1952:61
Alatiformia Struve, 1963:499
Alatochonetes Liang, 1990:145
Alatoproductus Ching and Zhu, 1978, in Jing and Hu, 1978:120
Alatorthotetina He & Zhu, 1985:200
Alatothyris Waterhouse and Gupta, 1986:51
Aldanispirifer Alekseeva, 1967:96
Aldanotreta Pelman, 1977:51
Aldingia Thomson, 1916:501
Aldynkulirhynchia Ovtsharenko, 1977 [nomen nudum]
Alekseevaella Baranov, 1980:80
Alexenia Ivanova, 1935, in Ivanov, 1935:89
Alichovia Gorjansky, 1969:97
Aliconchidium St. Joseph, 1942:247
Alienorthis Liu, 1982 [nomen nudum]
Alifera Muir(c)Wood and Cooper, 1960 [replaced by Alitaria]
Alimbella Andreeva, 1960, in Markowskii, 1960:293
Alipunctifera Waterhouse, 1975:17
Aliquantula Richardson, 1991:42
Alisina Rowell, 1962:141
Alispira Nikiforova, 1961, in Nikiforova and Andreeva, 1961:243
Alispirifer Campbell, 1961:434
Alispiriferella Waterhouse and Waddington, 1982:30
Alitaria Cooper and Muir(c)Wood, 1967:808 [new name for Alifera]
Alithyris Sun, 1981:242
Allanaria Crickmay, 1953 [invalid new name for Allanella, Allanella not preoccupied]
Allanella Crickmay, 1953:5
Allanetes Boucot and Johnson, 1967:142
Allorhynchoides Savage, Everlein, and Churkin, 1978:392
Allorhynchus Weller, 1910:509
Almerarhynchia Calzada Badia, 1974:94
Almerasithyris Tchorszhewsky, 1973 [nomen nudum]
Almiralthyris Calzada, 1994:42
Almorhynchia Ovtsharenko, 1983:45
Alorostrum Savitskii, 1992:107
Alphachoristites Gatinaud, 1949:492 [=Choristites]
Alphacyrtiopsis Gatinaud, 1949:490 [=Cyrtiopsis]
Alphaneospirifer Gatinaud, 1949:491 [=Neospirifer]
Altaeorthis Severgina, 1967:124
Altaestrophia Bublichenko, 1956:96 [=Leptodontella]
Altaethyrella Severgina, 1978:38
Altajella Kulkov, 1962:653
Altiplecus Stehli, 1954:349
Altoplicatella Xu and Liu, 1983:114
Altorthis Andreeva, 1960, in Markowskii, 1960:288 [=Nothorthis]'(0*„(„(∞∞'åAltunella Liu, Zhang and Di, 1984:160
Alvarezites Struve, 1992:559 [subgenus of Athyris]
Alwynella Spjeldnaes, 1957:85
Alwynia Stehli, 1961:464
Ambardella Andreeva, 1987:37
Ambikella Sahni and Srivastava, 1956:207
Amblotrema Rafinesque, 1831 [incertae sedis]
Amblytrema Agassiz, 1846 [misspelling of Amblotrema]
Ambocoelia Hall, 1860:71
Amboglossa Wang and Zhu, 1979:60
Ambonorthella Bassett, 1972:66
Ambothyris George, 1931:42
Amesopleura Carter, 1967:364
Ametoria Cooper and Grant, 1975:1055
Amictocracens Henderson and MacKinnon, 1981:295
Amissopecten Havlicek, 1960:243
Amoenirhynchia Siblik, 1986:23
Amoenospirifer Havlicek, 1957:439
Amosina Boucot, 1975:360
Amphiclina Laube, 1865:28
Amphiclinodonta Bittner, 1888:288
Amphigenia Hall, 1867:163
Amphipella Cooper and Grant, 1969:11
Amphiplecia Wright and Jaanusson, 1993:99
Amphistrophia Hall and Clarke, 1892:292
Amphistrophiella Harper and Boucot, 1978:157
Amphithyris Thomson, 1918:20
Amphitomella Bittner, 1890:298
Amsanella Boucot, 1975 [nomen nudum]
Amsdenella Tillman, 1967:1251
Amsdenina Boucot, 1975:357
Amsdenostrophiella Harper and Boucot, 1978:158 [subgenus of Amphistrophiella]
Amurothyris Koczyrkevicz, 1976:77
Amydroptychus Cooper, 1989:10
Amygdalocosta Waterhouse, 1967:101
Anabaia Clarke, 1893, in Hall and Clarke, 1893:141
Anabaria Lopushinskaja, 1965:27
Anabolotreta Rowell and Henderson, 1978:8
Anadyrella Dagys, 1974:185
Anakinetica Richardson, 1987:38
Anaptychius Hoover, 1981:107
Anarhynchia Ager, 1968:63
Anastrophia Hall, 1867:163 [new name for Brachymerus]
Anathyrella Khalfin, 1960:476
Anathyris Peetz, 1901:378
Anatreta Mei, 1993:405
Anatrypa Nalivkin, 1941:172
Anazyga Davidson, 1882:128
Anchigonites Opik, 1939:136
Ancillotoechia Havlicek, 1959:78
Ancistrocrania Dall, 1877:13 [new name for Cranopsis]
Ancistrorhyncha Ulrich and Cooper, 1942:624
Ancorellina Mancenido and Damborenea, 1991:89
Ancorhynchia Ching and Ye, 1979:101
Ancylostrophia Harper, Johnson, and Boucot, 1967:423
Andalucinetes Racheboeuf, 1985:660
Andobolus Kozlowski, 1930:316
Andreaspira Abramov and Grigorjewa, 1986:144
Aneboconcha Cooper, 1973:28
Anechophragma Neuman, 1977:37
Anelasma Ivanov, 1925 [replaced by Brachythyrina]
Anelasmina Semichatova, 1939 [=Anelasma]
Anelotreta Pelman, 1986, in Yermak and Pelman, 1986:198
Anemonaria Cooper and Grant, 1969:8
Aneuthelasma Cooper and Grant, 1976:2906
Angarella Asatkin, 1932:486
Angiospirifer Legrand(c)Blain 1985:567 
Angulotreta Palmer, 1954:769
Angusticardinia Schuchert and Cooper, 1931:244
Angustothyris Dagys, 1972:31
Aniabrochus Cooper, 1983:170 [new name for Platythyris]
Anidanthus Hill, 1950:10
Anidanthus Whitehouse, 1928 [nomen nudum; =Anidanthus Hill, 1950]
Animonithyris Cooper, 1983:52
Anisactinella Bittner, 1890:302
Anisopleurella Cooper, 1956:805
Annuloplatidia Zezina, 1981:144 
Anomactinella Bittner, 1890:300'(0*„(„(∞∞'åAnomalesia Cooper and Grant, 1976:2819
Anomaloglossa Percival, 1978:125
Anomaloria Cooper and Grant, 1969:16
Anomalorthis Ulrich and Cooper, 1936:622
Anoplia Hall and Clarke, 1892:309
Anopliopsis Girty, 1938:281
Anoplotheca Sandberger, 1855:8
Anoptambonites Williams, 1962:170
Ansehia Termier and Termier, 1970:456
Anteletes Orbigny, 1850 [misspelling of Enteletes]
Antelocoelia Isaacson, 1977:171
Anteridocus Cooper and Grant, 1976:2055
Antezeilleria Xu and Liu, 1983:104
Anthracospirifer Lane, 1963:388
Anthracothyrina Legrand(c)Blain, 1984, in Legrand(c)Blain, Delvolve, and Perret, 1984:308 [subgenus of Brachythyrina]
Antigaleatella Sapelnikov and Rukavischnikova, 1975:74
Antigonambonites Opik, 1934:147
Antigoniarcula Elliott, 1959:146
Antinomia Catullo, 1851:75
Antinomya Davidson, 1853 [misspelling of Antinomia]
Antiptychina Zittel, 1880:704
Antiquatonia Miloradovich, 1945:499
Antirhynchonella Oehlert, 1887, in Fischer, 1887:1311
Antirhynchonella Quenstedt, 1871 [nomen nudum; =Antirhynchonella Oehlert, 1887]
Antispirifer Williams, 1916, in Williams and Breger, 1916:116
Antistrix Johnson, 1972:121
Antizygospira Fu, 1982:146 
Antronaria Cooper and Grant, 1976:2036
Anulatrypa Havlicek, 1987:73
Anx Havlicek, 1980:301
Aorhynchia MacFarlan, 1992:173
Aparimarhynchia MacFarlan, 1992:65
Apatecosia Cooper, 1983:53 
Apatobolus Popov, 1980, in Nazarov and Popov, 1980:81
Apatomorpha Cooper, 1956:709
Apatorthis Opik, 1933:6
Apatoskenidioides Liu, Zhu and Xue, 1985:22
Aperispirifer Waterhouse, 1968:35
Apertirhynchella Siblik, 1986:26 
Aphanomena Bergstrom, 1968:13
Aphaurosia Cooper and Grant, 1976:2048
Apheathyris Fu, 1982:172
Aphelesia Cooper, 1959:41
Aphelotreta Rowell, 1980:10
Apheoorthina Havlicek, 1949:99 [=Apheoorthis]
Apheoorthis Ulrich and Cooper, 1936:620
Aphragmus Cooper, 1983:171 
Apicilirella Su, 1976:179
Apistoconcha Conway Morris, 1990, in Bengtson et al., 1990:171
Apletosia Cooper, 1983:226 
Apleurotis Rafinesque, 1819 [nomen nudum]
Apodosia Smirnova and MacKinnon, 1995:686
Apollonorthis Mitchell, 1974:392
Apomatella Schuchert and Cooper, 1931:245
Apopentamerus Boucot and Johnson, 1979:104
Aporthophyla Ulrich and Cooper, 1936:625
Aporthophylina Liu, 1976:144
Apothyris Cooper, 1989:101 
Apousiella Carter, 1972:732
Apringia Gregorio, 1886:23
Apsilingula Williams, 1977:403
Apsocalymma McIntosh, 1974:213
Apsotreta Palmer, 1954:770
Arabatia Cooper, 1989:70
Arabicella Cooper, 1989:70 
Araksalosia Lazarev, 1989:36
Araktina Koneva, 1992:94
Araneatrypa Havlicek, 1987:90
Arapsopleurum Cooper, 1989:73
Arapsothyris Cooper, 1989:74
Araratella Abramian, Sartenaer and Plodowski, 1975, in Sartenaer and Plodowski, 1975:5
Araspirifer Havlicek, 1987:242
Aratanea Schmidt, 1967:92
Aratoechia Havlicek, 1982:368
Araxathyris Grunt, 1965, in Ruzhentsev and Sarytcheva, 1965:240
Araxilevis Sarytcheva, 1965, in Ruzhentsev and Sarytcheva, 1965:221
Araxina Askerov, 1965; 1967 [nomina nuda]
Arbizustrophia Garcia(c)Alcalde, 1972:57'(0*„(„(∞∞'åArcelinithyris Almeras, 1971:173
Arceythyris Rollet, 1964:38
Archaeorthis Schuchert and Cooper, 1931:243
Archaiosteges Carter, 1991:360
Archambona Cooper, 1988:185 [subjective synonym of Spanodonta(c) as per communications of Laurie & Cooper]
Archeochonetes Racheboeuf and Copper, 1986:1303
Arcosarina Ching, Sun, and Ye, 1979:185
Arcticalosia Waterhouse, 1986:2 
Arctispira Smith, 1980:66
Arctitreta Whitfield, 1908:57
Arctochonetes Ifanova, 1968:29
Arctohedra Cooper, 1936:210
Arctolaballa Dagys, 1977 [=Pseudolaballa]
Arctomeristina Amsden, 1978:33
Arctosia Cooper, 1983:250
Arctospirifer Stainbrook, 1950:382
Arctothyris Dagys, 1965:140
Arcualla Walmsley and Boucot, 1975:79
Arcuatothyris Popiel(c)Barczyk, 1972:136
Arcullina Waterhouse, 1986:4
Ardiviscus Lazarev, 1986, in Lazarev and Pushkin, 1986:42
Arduennensisspirifer Kutscher and Mittmeyer, 1970 [subgenus of Arcospirifer; nomen nudum]
Arduspirifer Mittmeyer, 1972:101 [subgenus of Acrospirifer; elevated to genus by Mittmeyer in 1973]
Areella Erlanger, 1992:51
Arenaciarcula Elliott, 1959:147
Arenorthis Havlicek, 1970:29
Areostrophia Havlicek, 1965:293
Argella Menakova and Nikiforova, 1986:68
Argentiproductus Cooper and Muir(c)Wood, 1951:195 [new name for Thomasella Paul, 1942]
Argiope Deslongchamps, 1842 [replaced by Megathiris]
Argorhynx Havlicek, 1992:110
Argovithyris Rollet, 1972:95
Argyope Davidson, 1850 [misspelling of Argiope]
Argyrotheca Dall 1900:44 [new name for Cistella]
Arionthia Cooper and Grant, 1976:2750
Arktikina Grunt, 1977:69
Aromasithyris Almeras, 1971:544
Aroonia Bengtson, 1990, in Bengtson et al., 1990:181
Arquinisca Radwanska and Radwanski, 1994:254 [subgenus of Discinisca]
Artimyctella Liu, 1979:508
Artiotreta Ireland, 1961:1138
Ascanigypa Havlicek, 1990, in Havlicek and Storch, 1990:113
Aseptagypa Brice, 1982:26 [subgenus of Carinagypa]
Aseptalium Hou and Xian, 1975:37
Aseptella Martinez and Winkler, 1977:18
Aseptirhynchia Soja, 1988:153
Aseptonetes Isaacson, 1977:177
Asiacranaena Kaplun, 1991, in Kaplun and Krupchenko, 1991:142 [subgenus of Cranaena]
Asiarhynchia Su, 1980:295
Asiatotoechia Rzonsnitzkaja and Kossovaja, 1978 [nomen nudum]
Asiomeekella Liang, 1990:120
Asioproductus Chan, 1977; 1978; 1979 [=Transennatia]
Askepasma Laurie, 1986:449 
Asperlinus Waterhouse and Piyasin, 1970:132
Aspidothyris Diener, 1908:59
Aspinosella Waterhouse, 1982:47 
Astamena Roomusoks, 1989:114
Astegosia Cooper and Grant, 1969:16
Astraborthis Williams, 1974:69
Astua Havlicek, 1992:85
Asturistrophia Garcia(c)Alcalde, 1992:72
Astutorhyncha Havlicek, 1961:105
Asymmetrochonetes Smith, 1980:49 
Asymphylotoechia Ross, 1970:60
Asyrinx Hudson and Sudbury, 1959:46
Asyrinxia Campbell, 1957:80
Atactosia Cooper, 1983:173 
Atelelasma Cooper, 1956:517
Atelelasmoidea Zeng, 1987:225
Atelestegastus Cooper and Grant, 1975:829
Atelithyris Smirnova, 1975:77
Athabaschia Crickmay, 1963:10 [=Ladogioides]
Athyrella Renz, 1913 [nomen nudum; =Spirigerella]
Athyrhynchus Johnson, 1973:467
Athyris McCoy, 1844:147
Athyrisina Hayasaka, 1922:52
Athyrisinoides Chen and Wan, 1978; 1979 [junior homonym of Athyrisinoides Jiang, 1978]
Athyrisinoides Jiang, 1978:303'(0*„(„(∞∞'åAthyrisinopsis Zhang, 1983, in Zhang, Fu and Ding, 1983:354
Athyrorhynchia Xu and Liu, 1983:91
Atlanticocoelia Koch, 1981:95
Atlantida Havlicek, 1971:37
Atretia Jeffreys, 1870 [=Cryptopora]
Atribonium Grant, 1965:38
Atrypa Dalman, 1828:127
Atryparia Copper, 1966:982
Atrypella Kozlowski, 1929:30
Atrypellina Menakova and Nikiforova, 1986:66
Atrypina Hall and Clarke, 1893:162
Atrypinella Khodalevich, 1939:45
Atrypinopsis Rong and Yang, 1981:232 [subgenus of Atrypina]
Atrypoidea Mitchell and Dun, 1920:272
Atrypopsis Poulsen, 1943:44 [=Dubaria]
Atrypunculus Havlicek, 1987:94
Atrythyris Struve, 1965:218
Attenuatella Stehli, 1954:343
Auchmerella Struve, 1964:521
Aucklandirhynchia MacFarlan, 1992:217
Aulacatrypa Havlicek, 1987:241; Havlicek, 1990, in Havlicek and Storch, 1990:203
Aulacella Schuchert and Cooper, 1931:246
Aulacophoria Schuchert and Cooper, 1931:247
Aulacorhyna Strand, 1928:37 [new name for Aulacorhynchus; =Isogramma]
Aulacorhynchus Dittmar, 1872 [replaced by Aulacorhyna]
Aulacothyris Douville, 1879:277
Aulacothyroides Dagys, 1965:155
Aulacothyropsis Dagys, 1959:99
Aulidospira Williams, 1962:252
Aulie Nikitin and Popov, 1984, in Klenina, Nikitin, and Popov, 1984:148
Aulites Richardson, 1987:45
Aulonotreta Kutorga, 1848:282
Auloprotonia Muir(c)Wood and Cooper, 1960:273
Aulosteges Helmersen, 1847:331
Auriculispina Waterhouse, 1975:13
Austinella Foerste, 1909:224
Australiarcula Elliott, 1960:26
Australina Clarke, 1912:10
Australirhynchia Savage, 1968:731
Australispira Percival, 1991:169
Australocoelia Boucot and Gill, 1956:1174
Australosia McKellar, 1970:12
Australospirifer Caster, 1939:159
Australostrophia Caster, 1939:83
Austriella Bittner, 1890 [replaced by Austriellula]
Austriellina Schuchert and LeVene, 1929 [invalid new name for Austriella, already renamed]
Austriellula Strand, 1928:38 [new name for Austriella]
Austrirhynchia Ager, 1959:325
Austrochoristites Roberts, 1971:230
Austrohedra Roberts, 1990, in Roberts and Jell, 1990:276
Austronoplia Isaacson, 1977:178
Austrospirifer Glenister, 1956:58
Austrothyris Allan, 1939:238
Aviformia Xian, 1988, in Hou, 1988:227
Avisyrinx Martinez, 1975:33
Avonia Thomas, 1914:259
Avonothyris Buckman, 1918:102
Axiodeaneia Clark, 1917:375
Azamella Laurie, 1991:93
Azerithyris Askerov, 1964; 1965; 1967 [nomina nuda]
Azygidium Waterhouse, 1983:153
Babinia Racheboeuf and Branisa, 1985:1435
Babukella Dagys, 1974:208
Backhausina Pajaud, 1966:125
Bactrynium Emmrich, 1855:449
Badainjarania Zhang, 1980 [nomen nudum]; 1981:388
Baeorhynchia Cooper, 1989:12
Bagnorthis Levy and Nullo, 1974:184
Bagrasia Nalivkin, 1960, in Sarytcheva et al., 1960:231
Bailliena Nelson and Johnson, 1968:723
Bailongjiangella Fu, 1982:139
Baissalosteges Kotljar, 1989, in Kotljar et al., 1989:119
Bajanhongorella Rozman, 1977:124
Bajanorthis Andreeva, 1968, in Markowskii, 1968:73
Bajkuria Ustritsky, 1963, in Ustritsky and Tschernjak, 1963:116
Bajtugania Grunt, 1980:97
Bakonyithyris Voros, 1983:22
Balakhonia Sarytcheva, 1963, in Sarytcheva et al., 1963:231'(0*„(„(∞∞'åBalanoconcha Campbell, 1957:86
Balatonospira Dagys, 1974:137
Balkhasheconcha Lazarev, 1985:68 
Bancroftina Sinclair, 1946:295 [new name for Raymondella Whittington, 1938]
Bandoproductus Ching and Sun, 1979 [nomen nudum]
Bandoproductus Jing and Sun, 1981:139
Barbaestrophia Havlicek, 1965:7
Barbarorthis Opik, 1934:183
Barbarothyris Wang and Rong, 1986:214
Barbatulella Williams and Lockley, 1983:393
Barkolia Zhang Chuan, 1981, in Zhang and Zhang, 1981:97
Barrandella Hall and Clarke, 1893 [=Antirhynchonella]
Barrandina Booker, 1926:132
Barroisella Hall and Clarke, 1892:63
Barzellinia Gregorio, 1930:8
Bashkiria Nalivkin, 1979:144
Basilicorhynchus Crickmay, 1952:1
Basiliola Dall, 1908:442
Basiliolella Hondt, 1987:39
Basiola Thomson, 1915 [misspelling of Basiliola]
Batenevotreta Ushatinskaia, 1992:87
Bateridium Su, Rong, and Li, 1985:84 
Baterospirifer Su and Li, 1984, in Rong, Su, and Li, 1984:64
Bathycoelia Foerste, 1909 [replaced by Pionodema]
Bathymyonia Muir(c)Wood and Cooper, 1960:245
Bathynanus Foster, 1974:80
Bathyrhyncha Fuchs, 1923:854
Baturria Carls, 1974:167
Bazardarella Ovtsharenko, 1977 [nomen nudum]
Bazardarella Ovtsharenko, 1983:159
Beachia Hall and Clarke, 1893:260
Beckmannia Mohanti, 1972:166
Becscia Copper, 1995:853
Beecheria Hall and Clarke, 1893:300
Begiarslania Titova, 1992:142
Beichuanella Chen, 1978:339
Beichuanrhynchus Chen, 1990:234
Beitaia Rong and Yang, 1974:199
Bejrutella Tchorszhewsky, 1972:40
Bekkerella Rosenstein, 1943 [replaced by Elsaella]
Bekkerella Reed, 1936:39 [subgenus of Rafinesquina]
Bekkerina Roomusoks, 1993:50
Bekkeromena Roomusoks, 1963:235
Belbekella Moisseiev, 1939:195; 1956:62
Beleutella Litvinovich, 1967:55
Bellaclathrus Winters, 1963:26
Bellimurina Cooper, 1956:854
Belothyris Smirnova, 1960:117
Benignites Havlicek, 1952:409 [=Merciella]
Bergalaria Schmidt, 1975:101
Beschevella Poletaev, 1975:51
Betachoristites Gatinaud, 1949:492 [=Choristites]
Betacyrtiopsis Gatinaud, 1949:490 [=Cyrtiopsis]
Betaneospirifer Gatinaud, 1949:491 [=Neospirifer]
Betterbergia Schmidt, 1981:218
Biarea Torbakova, 1959, in Khodalevich et al., 1959:75
Biarella Markowskii, 1988:82
Bibatiola Grant, 1976:136
Bicarinatina Batrukova, 1967 [nomen nudum]; 1969:59
Bicepsirhynchia Shi, 1990:310
Bicia Walcott, 1901:677
Biconostrophia Havlicek, 1956:562
Biconvexiella Waterhouse, 1983:154
Bicornes Quenstedt, 1852 [invalid name, Opinion 907 ICZN]
Bicuspina Havlicek, 1950:18
Bidentatus Khodalevich and Breivel, 1972, in Malygina et al., 1972:202
Biernatella Balinski, 1977:179
Biernatia Holmer, 1989:133 
Biernatium Havlicek, 1975:234
Bifida Davidson, 1882:27
Bifolium Elliott, 1948:3
Bihendulirhynchia Muir(c)Wood, 1935:104
Bihenithyris Muir(c)Wood, 1935:111
Bilaminella Babanova, 1964:66
Billingsella Hall and Clarke, 1892:230
Billingsia Ford, 1886 [replaced by Elkania]
Bilobia Cooper, 1956:760
Bilobites Linne, 1775 [=Dicoelosia]'(
0*„(„(∞∞'åBilotina Reed, 1944:109
Bimuria Ulrich and Cooper, 1942:623
Biparetis Amsden, 1974:54
Biplatyconcha Waterhouse, 1983:125 [new name for Platyconcha] 
Biplicatoria Cooper, 1983:174
Birchsella Clarke, 1987:282
Biseptum Khodalevich and Breivel, 1959, in Khodalevich et al., 1959:39
Bisinocoelia Havlicek, 1953:7
Bispinoproductus Stainbrook, 1947:311 [=Leioproductus]
Bistramia Hoek, 1912, in Steinmann and Hoek, 1912:247
Bisulcata Boucot and Johnson, 1979:117
Bisulcata Boucot, 1975 [nomen nudum; =Bisulcata Boucot and Johnson, 1979]
Bisulcatella Boucot, 1975 [nomen nudum]
Bisulcina Titova, 1977:81
Bittnerella Dagys, 1974:77
Bittnerula Hall and Clarke, 1894:764
Blairella Miller and Gurley, 1896 [nomen nudum; =Rhipidomella]
Blasispirifer Kulikov, 1950:6 [=Spiriferella]
Bleshidimerus Havlicek, 1990, in Havlicek and Storch, 1990:101
Bleshidium Havlicek, 1982:371
Blochmannella Leidhold, 1921:356
Blyskavomena Havlicek, 1976:369
Bobinella Andreeva, 1968, in Markowskii, 1968:80
Bockelia Neuman, 1989:63
Bodrakella Moisseiev, 1936:47
Bohemiella Schuchert and Cooper, 1931:242
Bohemirhynchia Nekvasilova, 1973:78
Boicinetes Havlicek and Racheboeuf, 1979:73 [subgenus of Chonetes]
Bojarinovia Aksarina, 1978, in Aksarina and Pelman, 1978:106
Bojodouvillina Havlicek, 1967:171
Bojothyris Havlicek, 1957 [nomen nudum]; 1959:247
Bolgarithyris Titova, 1986:118
Bolilaspirifer Sun, 1981:206
Boloria Grunt, 1973, in Grunt and Dmitriev, 1973:119
Bomina Korovnikov & Ushatinskaia, 1994:128
Boonderella Percival, 1991:130
Booralia Campbell, 1961:449
Boreadocamara Curry and Williams, 1984:309 
Boreadorthis Opik, 1934:184
Borealirhynchia Su, 1976:194
Borealis Boucot, Johnson, and Rubel, 1971:274
Borealispirifer Hou and Su, 1993, in Su and Hou, 1993:140
Boreiospira Dagys, 1974:126
Boreiothyris Dagys, 1968:110
Bornhardtina Schulz, 1914:363
Borszhaviella Tchorszhewsky, 1973 [nomen nudum]
Bortegitoechia Erlanger, 1994:94
Borua Williams and Curry, 1985:250
Bosquetella Smirnova, 1969:83
Bothrionia Cooper and Grant, 1975:985
Bothrostegium Cooper and Grant, 1974:330
Bothrothyris Cooper, 1983:61
Boticium Havlicek and Mergl, 1982:43 
Botsfordia Matthew, 1891:148
Boubeithyris Cox and Middlemiss, 1978:419
Bouchardia Davidson, 1850:65
Bouchardiella Doello(c)Jurado, 1922:200
Bouchardopsis Maillieux, 1933 [nomen nudum; =Tylothyris]
Boucotella Bowen, 1966:186
Boucotia Gill, 1969:1227
Boucotides Amsden, 1968:44
Boucotinskia Brunton and Cocks, 1967:180
Boucotstrophia Jahnke and Racheboeuf, 1980:203; Jahnke, 1981:150
Bouskia Havlicek, 1975:233 [=Molongella per written comm. of Havlicek]
Bowanorthis Percival, 1991:123
Bozshakolia Ushatinskaia, 1986, in Ushatinskaia, Gidaspov and Riazantsev, 1986:38 
Brachiopus Rafinesque, 1831 [sine type]
Brachymerus Shaler, 1865 [replaced by Anastrophia]
Brachymimulus Cockerell, 1929:105 [new name for Mimulus]
Brachyprion Shaler, 1865:63 [subgenus of Strophodonta]
Brachythyrina Fredericks, 1929:385 [new name for Anelasma]
Brachythyrinella Waterhouse and Gupta, 1978:425
Brachythyris McCoy, 1844:128
Brachyzyga Kozlowski, 1929:31
Bracteoleptaena Havlicek, 1963:224
Bradfordirhynchia Shi and Grant, 1993:26
Brahimorthis Havlicek, 1971:29
Branconia Gagel, 1890:62'(0*„(„(∞∞'åBrandysia Havlicek, 1975:231
Branikia Havlicek, 1957:437
Branxtonia Booker, 1930:30 [=Wyndhamia]
Brasilia Clarke, 1913 [replaced by Brasilina, Chapadella, Oliveirella, and Paranaia]
Brasilica Greger, 1920 [misspelling of Brasilia]
Brasilina Clarke, 1921:139 [new name for Brasilia; =Paranaia]
Brasilioproductus Mendes, 1959:48
Brevicamera Cooper, 1956:560
Brevilamnulella Amsden, 1974:62
Brevilamula Amsden, 1974 [nomen nudum]
Brevipelta Geyer, 1994:996
Breviseptum Sapelnikov, 1960:109 [subgenus of Conchidium]
Brevispirifer Cooper, 1942:231
Brochocarina Brunton, 1968:31
Broeggeria Walcott, 1902:605
Bronnothyris Popiel(c)Barczyk and Smirnova, 1978:134
Brooksina Kirk, 1922:3
Browneella Chatterton, 1973:117
Brunnirhyncha Havlicek, 1979:97
Bruntonites Struve, 1992:559 [subgenus of Athyris]
Brynella Bancroft, 1933 [nomen nudum]
Bryorhynchus Cooper and Grant, 1969:11
Buceqia Havlicek, 1984:109
Buchanathyris Talent, 1956:36
Buckmanithyris Tchorszhewsky, 1990:33
Bufocephalus Linne, 1779 [incertae sedis]
Bulahdelia Roberts, 1976, in Roberts et al., 1976:213
Bulgania Erlanger, 1994:109
Bullarina Ching and Sun, 1979 [nomen nudum]
Bullarina Jing and Sun, 1981:154 
Bullothyris Sucic(c)Protic, 1971:21 [subgenus of Loboidothyropsis]
Buntoxia Lazarev, 1986, in Murav'ev and Grigorjewa, 1986:94
Burmirhynchia Buckman, 1915 [nomen nudum]; 1918:49
Burovia Ustritsky, 1980:25 
Burrirhynchia Owen, 1962:59
Bursula Klein, 1753 [nonbinomial]
Butkovia Baranov, 1987:113 
Buxtonia Thomas, 1914:259 [junior homonym(c) no replacement name, yet]
Buxtoniella Abramov and Grigorjewa, 1986:94
Buxtonioides Mendes, 1959:43
Bynguanoia Roberts, 1990, in Roberts and Jell, 1990:281
Bystromena Williams, 1974:146
Cacata Strand, 1928 [new name for Thomsonia; =Coptothyris]
Cacemia Mitchell, 1974:394
Cactosteges Cooper and Grant, 1975:850
Cadomella Munier(c)Chalmas, 1887, in Fischer, 1887:1285
Cadudium Havlicek, 1985:296
Caenanoplia Carter, 1968:1143
Caenotreta Cocks, 1979:94
Caeroplecia Williams, 1974:121
Calcirhynchia Buckman, 1914 [nomen nudum]; 1918:30
Caledorhynchia MacFarlan, 1992:209
California Bassler, 1915 [misspelling of Cliftonia]
Callaiapsida Grant, 1971:323 [subgenus of Camerisma]
Callicalyptella Boucot and Johnson, 1972:301
Calliglypha Cloud, 1948:468
Calliomarginatia Ching, 1976, in Zhang and Ching, 1976:181
Callipentamerus Boucot, 1964:887
Callipleura Cooper, 1942:228 [new name for Cyclorhina]
Calliprotonia Muir(c)Wood and Cooper, 1960:246
Callispirifer Perry, 1984:115
Callispirina Cooper and Muir(c)Wood, 1951:195 [new name for Mansuyella]
Calloria Cooper and Lee, 1993:267
Callospiriferina Rousselle, 1977:157
Callytharrella Archbold, 1985:19 
Calvinaria Stainbrook, 1945:44
Calvustrigis Carter, 1987:68
Calyptolepta Neuman, 1977:35
Calyptoria Cooper, 1989:65 
Camarelasma Cooper and Grant, 1976:2900
Camarella Dall, 1877; Oehlert, 1887 [misspelling of Camerella]
Camarium Hall, 1859:43 [=Merista]
Camarophorella Hall and Clarke, 1893:215
Camarophoria Hermannsen, 1846 [misspelling of Camerophoria]
Camarophorina Licharew, 1934:213
Camarophorinella Licharew, 1936:63
Camarospira Hall and Clarke, 1893:82
Camarothyridina Linnik, 1966:129'(	0*„(„(∞∞'åCamarotoechia Hall and Clarke, 1893:190
Camarotoechioides Rzonsnitzkaja, 1978:178
Cambrotrophia Ulrich and Cooper, 1937:78 [new name for Eostrophia]
Camdella Ustritsky, 1971 [nomen nudum? misspelling of Gamdaella?]
Camerella Billings, 1859:301
Camerisma Grant, 1965:64
Camerophoria King, 1844 [nomen nudum]; 1846 [=Stenoscisma]
Camerophorina Schmidt, 1941:43
Camerothyris Bittner, 1890:318
Campages Hedley, 1905:43
Campylorthis Ulrich and Cooper, 1942:621
Canadospira Dagys, 1972:40
Canalilatus Pelman, 1983:126
Canavaria Merla, 1928 [replacement by Gemmellaria invalid, Gemmellaria preoccupied; replaced by Sicelia]
Canavirila Sartenaer, 1994:97
Cancellospirifer Campbell, 1953:10
Cancellothyris Thomson, 1926:525
Cancrinella Fredericks, 1928:784
Cancrinelloides Ustritsky, 1963, in Ustritsky and Tschernjak, 1963:85
Candispirifer Havlicek, 1971:26
Caninella Liang, 1990:217
Cantabriella, Martinez and Rio Garcia, 1987:21
Canthylotreta Rowell, 1966:5
Capellinia Hall and Clarke, 1893 [replaced by Capelliniella]
Capelliniella Strand, 1928:38 [new name for Capellinia]
Capillarina Cooper, 1983:177
Capillifera Jing and Ju, 1978:120; Ching and Ye, 1979:86 [invalid new name for Chilianshania, Chilianshania not preoccupied]
Capillirhynchia Buckman, 1914 [nomen nudum]; 1918:58
Capillirostra Cooper and Muir(c)Wood, 1951:195 [new name for Rhynchonellopsis Bose, 1894]
Capillispirifer Zhang Zi(c)xin, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:357
Capillithyris Katz, 1974:258
Capillomesolobus Pecar, 1986:18
Capillonia Waterhouse, 1973:37
Caplinoplia Havlicek and Racheboeuf, 1979:102
Carapezzia Tomlin, 1930:24 [new name for Geyeria]
Carbocyrtina Ivanova, 1975:81
Cardiarina Cooper, 1956:527
Cardinirhynchia Buckman, 1918:74
Cardinocrania Waagen, 1885:746
Cardiodonta Hall, 1850 [nomen nudum]
Cardiothyris Roberts, 1971:178
Caricula Grant, 1976:128
Carinagypa Johnson and Ludvigsen, 1972:128
Carinastrophia Gratsianova, 1975:64 [subgenus of Areostrophia]
Carinatina Nalivkin, 1930:192
Carinatinella Gratsianova, 1967:97
Carinatothyris Tchorszhewsky, 1990:38
Carinatrypa Copper, 1973:496
Cariniferella Schuchert and Cooper, 1931:246
Carinokoninckina Jin and Fang, 1977:59
Carlinia Gordon, 1971:259
Carlopsina Reed, 1954:183 [=Schellwienella]
Carmanella Boucot, 1975 [nomen nudum]
Carneithyris Sahni, 1925:364
Carolirhynchia Havlicek, 1992:73
Carpatothyris Smirnova, 1975:135
Carpinaria Struve, 1982:213 [subgenus of Spinocyrtia]
Carringtonia Brunton and Mundy, 1986:2
Cartorhium Cooper and Grant, 1976:2191
Caryogyps Johnson, Boucot, and Murphy, 1976:53
Caryona Cooper, 1983:62
Caryorhynchus Crickmay, 1952:1
Casquella Percival, 1978:128
Cassianospira Dagys, 1972:103
Cassidirostrum McLaren, 1961:2
Castellaroina Boucot, 1972, in Amos, 1972:11
Catacephalus Yang, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:382 [subgenus of Geranocephalus]
Catazyga Hall and Clarke, 1893:157
Cathaysia China, 1966, in Wang et al., 1966:372
Cathayspirina Liang, 1990:340
Caucasella Moisseiev, 1934:83
Caucasiproductus Lazarev, 1987:50
Caucasithyris Askerov, 1964; 1965; 1967 [nomen nudum]
Caucasoproductus Kotljar, 1989, in Kotljar et al., 1989:121
Caucasorhynchia Dagys, 1963:66
Caucasothyris Dagys, 1974:192
Causea Wiman, 1905:53 [=Mickwitzia]
Cavatisinurostrum Sartenaer, 1972:2'(
0*„(„(∞∞'åCedulia Racheboeuf, 1979:256
Celdobolus Havlicek, 1982:63
Celebetes Grant, 1976:137
Celidocrania Liu, Zhu and Xue, 1985:9
Celsifornix Carter, 1974:677
Celtanoplia Racheboeuf, 1981:95 [subgenus of Plicanoplia]
Cenorhynchia Cooper and Grant, 1976:1986
Centronella Billings, 1859:131
Centronelloidea Weller, 1914:247
Centrorhynchus Sartenaer, 1970:11
Centrospirifer Tien, 1938:111 [=Cyrtospirifer]
Centrospirifer Grabau, 1931 [nomen nudum; =Centrospirifer Tien, 1938]
Ceocypea Grant, 1972:226
Ceramisia Cooper, 1983:227 
Cerasina Copper, 1995:850
Ceratreta Bell, 1941:233
Cerberatrypa Havlicek, 1990, in Havlicek and Kukal, 1990:162
Cererithyris Buckman, 1914 [nomen nudum]; 1918:109
Chaeniorhynchus Cooper and Grant, 1976:1999
Chaganella Nikitin, 1974:65
Chakassilingula Ushatinskaia, 1992:81
Chalimia Baranov, 1978:45
Chalimochonetes Baranov, 1980:142
Chaloupskia Neuman, 1989:61
Changshaispirifer Zhao, 1977:428
Changtangella Xian, 1983:10
Changyangrhynchus Yang, 1984:229 
Chaoella Licharew, 1931:161 [=Keyserlingina]
Chaoiella Fredericks, 1933:31
Chaoina Jin, 1974:308
Chapadella Greger, 1920:70 [new name for Brasilia; =Paranaia]
Chapadella Quadros, 1981:88 [junior homonym of Chapadella Greger, 1920]
Chapadella Quadros, 1981:89 [junior homonym of Chapadella Greger, 1920]
Chapinella Savage, Eberlein, and Churkin, 1978:388
Charionella Billings, 1861:148
Charionoides Boucot, Johnson, and Staton, 1964:817
Charltonithyris Buckman, 1915 [nomen nudum]; 1918:106
Chascothyris Holzapfel, 1895:234
Chathamithyris allan, 1932:15
Chattertonia Johnson, 1976:789
Chatwinothyris Sahni, 1925:368
Chaulistomella Cooper, 1956:432 [subgenus of Multicostella]
Cheirothyris Rollier, 1919:338
Cheirothyropsis Makridin, 1964:267
Chelononia Cooper and Grant, 1974:327
Chemungia Caster, 1939:107 [=Strophonelloides]
Cheniothyris Buckman, 1915 [nomen nudum]; 1918:128
Chenxianoproductus Liao and Meng, 1986:79
Cherkesovaena Havlicek, 1987:103
Cherubicornea Havlicek, 1992:70
Chianella Waterhouse, 1975:13
Chile Tikhonov, 1986 [nomen nudum]; Popov and Tikhonov, 1990:39
Chilianshania Yang and Ting, 1962, in Yang et al., 1962:86 [=Monticulifera]
Chilidiopsis Boucot, 1959:25 [=Fardenia]
Chilidonophora Dall, 1903:1538
Chilidorthis Havlicek, 1972, in Havlicek and Josopait, 1972:342
Chimaerothyris Paulus, Struve, and Wolfart, 1963:463
Chivatschella Zavodowsky, 1968, in Markowskii, 1968:125
Chlupacina Havlicek and Racheboeuf, 1979:86
Chlupacitoechia Havlicek, 1992:100
Chnaurocoelia Johnson, Boucot, and Murphy, 1976:95
Choanodus Cooper and Grant, 1974:402
Choanoproductus Termier and Termier, 1966 [nomen nudum]
Chondronia Cooper and Grant, 1976:2854
Chonetella Waagen, 1884:657
Chonetella Krotow, 1885 [replaced by Chonetina]
Chonetes Fischer de Waldheim, 1830, pl.26
Chonetina Krotow, 1888:500 [new name for Chonetella Krotow, 1885]
Chonetinella Ramsbottom, 1952:13
Chonetinetes Cooper and Grant, 1969:4
Chonetipustula Paeckelmann, 1931:31
Chonetoidea Jones, 1928:389
Choniopora Schauroth, 1854:546 [=Acanthocrania]
Chonopectella Sarytcheva, 1966:135 [new name for Chonopectoides Sarytcheva, 1965]
Chonopectoides Sarytcheva, 1965 [replaced by Chonopectella]
Chonopectoides Crickmay, 1963:23
Chonopectus Hall and Clarke, 1892:312
Chonosteges Muir(c)Wood and Cooper, 1960:113'(
0*„(„(∞∞'åChonostegoidella Lee and Yang, in Lee, Yang, and Feng, 1986:219
Chonostegoides Sarytcheva, 1965, in Ruzhentsev and Sarytcheva, 1965:212]
Chonostrophia Hall and Clarke, 1892:311
Chonostrophiella Boucot and Amsden, 1964:881
Choperella Ljaschenko, 1969:22
Choristitella Ivanov and Ivanova, 1937:163
Choristites Fischer de Waldheim, 1825:8
Choristothyris Cooper, 1942:233
Christianella Liang, 1983, in Liu, Xu, and Liang, 1983:277
Christiania Hall and Clarke, 1892:299
Chrustenopora Havlicek, 1968:123
Chrustenotreta Havlicek, 1994:60
Chuanostrophia Xian, 1988, in Hou, 1988:207
Chynistrophia Havlicek, 1977:301
Cilinella Havlicek, 1970:16
Cimicinella Schmidt, 1946:67
Cimicinoides Anderson, Boucot, and Johnson, 1969:156
Cincta Quenstedt, 1868:25
Cinctifera Muir(c)Wood and Cooper, 1960:166
Cinctopsis Sucic(c)Protic, 1985:45 
Cinerorthis Havlicek, 1974:167
Cingolospiriferina Pozza, 1992:211
Cingulodermis Havlicek, 1971:15
Cirpa Gregorio, 1930:40
Cistella Gray, 1853 [replaced by Argyrotheca]
Cistellarcula Elliott, 1954:726
Claratrypa Havlicek, 1987:240
Clarkeia Kozlowski, 1923:86
Clarkella Walcott, 1908:111
Clathrithyris Smirnova, 1971 [nomen nudum]; 1974:48
Clavigera Hector, 1879:538 [type designated by Marwick, 1953:45]
Clavigerina Marwick, 1946 [misspelling of Clavigera]
Clavodalejina Havlicek, 1977:227
Cleidothyris Paetel, 1875 [misspelling of Cleiothyris Phillips, 1841; =Athyris]
Cleiothyridellina Waterhouse, 1978:82
Cleiothyridina Buckman, 1906:324 [new name for Cleiothyris King, 1850]
Cleiothyris Phillips, 1841 [=Atrypa]
Cleiothyris King, 1850 [replaced by Cleiothyridina]
Cliftonia Foerste, 1909:82
Clinambon Schuchert and Cooper, 1932:115
Clintonella Hall and Clarke, 1893:160
Cliothyridina Girty, 1910 [improper emendation of Cleiothyridina]
Cliothyris Hall and Clarke, 1893 [misspelling of Cleiothyris Phillips, 1841]
Cliothyris Agassiz, 1846 [misspelling of Cleiothyris Phillips, 1841; =Athyris]
Clipsilia Dall, 1877 [misspelling of Clipsilis]
Clipsilis Rafinesque, 1820 [nomen nudum]
Clistotrema Rowell, 1963:35 [new name for Orbicella]
Clitambonites Agassiz, 1847:90
Clivosilingula Ushatinskaia, 1993:133
Clivospirifer Ljaschenko, 1973:108
Clorinda Barrande, 1879:109
Clorindella Amsden, 1964:236
Clorindina Khodalevich, 1939:11
Clorindinella Rzonsnitzkaja, 1975:61
Cloudella Boucot and Johnson, 1963, in Boucot, Caster, et al., 1963:123 [new name for Pleurothyris]
Cloudothyris Boucot and Johnson, 1968:B19
Cnismatocentrum Dall, 1920:321
Coelospira Hall, 1863:60
Coelospirella Su, 1976:203
Coelospirina Havlicek, 1956:586
Coeloterorhynchus Sartenaer, 1966:41
Coenothyris Douville, 1879:270
Colaptomena Cooper, 1956:889
Coledium Grant, 1965:96
Colinella Owen, 1981:306
Collarothyris Modzalevskaja, 1970:155
Collemataria Cooper and Grant, 1974:434
Colletostracia Farrell, 1992:19
Collinithyris Middlemiss, 1981:722
Collumatus Cooper and Grant, 1969:6
Colongina Breivel and Breivel, 1970:61
Colophragma Cooper and Dutro, 1982:77
Colosia Cooper, 1983:67
Colpotoria Cooper, 1989:18 
Columellithyris Tchorszhewsky and Radulovic, 1984:164
Comatopoma Havlicek, 1950:54
Comelicania Frech, 1901:551
Comiotoechia Ljaschenko, 1973:37'(
0*„(„(∞∞'åCompanteris Lazarev, 1981:79
Composita Brown, 1849:131
Compositella Xu and Liu, 1983:124
Compressoproductus Sarytcheva, 1960, in Sarytcheva et al., 1960:231
Compsoria Cooper, 1973:23
Compsothyris Jackson, 1918:188
Comuquia Grant, 1976:97
Conarosia Cooper, 1989:20
Conarothyris Cooper, 1983:69
Concaviseptum Brock, Engelbretsen and Dean(c)Jones, 1995:114
Conchidiella Khodalevich, 1939:32 [=Zdimir]
Conchidium Oehlert, 1887, in Fischer, 1887:1311
Concinnispirifer Boucot, 1975:367
Concinnithyris Sahni, 1929:11
Condrathyris Minato, 1953:69 [=Phricodothyris]
Conispirifer Ljaschenko, 1985:16 
Connectoproductus Donakova, 1974:173
Conodiscus Ulrich and Cooper, 1936:619
Conomimus Johnson, Boucot, and Gronberg, 1968:406
Conotreta Walcott, 1889:365
Conradia Hall, 1874 [=Dinobolus]
Contradouvillina Gratsianova, 1975:48
Convexothyris Smirnova, 1994:37
Coolinia Bancroft, 1949:7 [=Fardenia]
Coolkilella Archbold, 1993:14
Cooperea Cocks and Rong, 1989:147
Cooperina Termier, Termier, and Pajaud, 1966:332
Cooperithyris Tchorszhewsky, 1988:31 
Cooperrhynchia Sandy and Campbell, 1994:1245
Coptothyris Jackson, 1918:479 [new name for Thomsonia]
Cora Fredericks, 1928 [=Linoproductus]
Corbicularia Ljaschenko, 1973:29
Cordatomyonia Boucot, Gauri, and Johnson, 1966:164
Corineorthis Stubblefield, 1939:67
Coriothyris Ovtsharenko, 1983:168
Cornwallia Wilson, 1932:388
Coronalosia Waterhouse and Gupta, 1978:415
Corrugatella Khalfin, 1948 [=Cymostrophia]
Corrugatimediorostrum Sartenaer, 1970:23
Cortezorthis Johnson and Talent, 1967:143
Corvinopugnax Havlicek, 1961:36
Corylispirifer Gourvennec, 1989:191
Coscinarina Muir(c)Wood and Cooper, 1960:138
Coscinophora Cooper and Stehli, 1955:469
Costachonetes Waterhouse, 1975:2
Costachonetina Waterhouse, 1981, in Waterhouse, 1981:63 
Costacranaena Johnson and Perry, 1976:631
Costalosia Waterhouse and Shah, 1966 [=Licharewiella]
Costalosiella Waterhouse, 1983:119
Costanoplia Xu, 1977:65
Costatispirifer Archbold and Thomas, 1985:278
Costatrypa Copper, 1973:494
Costatumulus Waterhouse, 1983:154
Costellaria Muir(c)Wood and Cooper, 1960 [replaced by Costellarina]
Costellarina Muir(c)Wood and Cooper, 1967, in Cooper and Muir(c)Wood, 1967:808 [new name for Costellaria]
Costellirostra Cooper, 1942:231
Costellispirifer Boucot, 1973:51
Costicrura Hoover, 1981:96 
Costiferina Muir(c)Wood and Cooper, 1960:277
Costinifera Gobbett, 1963 [misspelling of Costiferina]
Costinorella Dagys, 1974:101
Costirhynchia Dagys, 1974 [replaced by Costirhynchopsis]
Costirhynchia Buckman, 1914 [nomen nudum]; 1918:39
Costirhynchopsis Dagys, 1977:139 [new name for Costirhynchia Dagys, 1974]
Costisorthis Havlicek, 1974:170
Costispinifera Muir(c)Wood and Cooper, 1960:217
Costispirifer Cooper, 1942:232
Costispiriferina Dagys, 1974:127
Costisteges Liao, 1980:32;1982
Costistricklandia Amsden, 1953:143
Costistrophomena Sheehan, 1987:41
Costistrophonella Harper and Boucot, 1978:99
Costithyris Middlemiss, 1981 [=Glosseudesia]
Costitrimerella Rong and Li, 1993:131
Costoconcha Ching, Sun, and Ye, 1979:193
Craigella Reed, 1935:353
Cranaena Hall and Clarke, 1893:297
Cranaenella Fenton and Fenton, 1924:129 [=Cranaena]'(
0*„(„(∞∞'åCrania Retzius, 1781:72
Cranicella Rafinesque, 1815 [nomen nudum]
Craniella Oehlert, 1888 [replaced by Petrocrania]
Craniops Hall, 1859:84
Craniotreta Termier and Monod, 1978:149
Craniscus Dall, 1871:27
Cranopsis Dall, 1871 [replaced by Ancistrocrania]
Craratula Bittner, 1890:66
Craspedalosia Muir(c)Wood and Cooper, 1960:82
Craspedelia Cooper, 1956:773
Craspedona Cooper and Grant, 1975:881
Crassatrypa Mizens, 1977:54
Crassiorina Havlicek, 1950:36 [=Cryptothyris]
Crassipunctatrypa Mizens and Rzonsnitzkaja, 1979:63
Crassispirifer Abramov and Grigorjewa, 1986:162 [replaced by Doescherella Abramov and Grigorjewa, 1987]
Crassispirifer Archbold and Thomas, 1985:282
Crassitestella Baarli, 1995:39
Crassumbo Carter, 1967:408
Cratispirifer Archbold and Thomas, 1985:280
Cratorhynchonella Tong, 1982:333 
Cratospirifer Tong, 1986:682
Cremnorthis Williams, 1963:378
Crenispirifer Stehli, 1954:348
Cretirhynchia Pettitt, 1950:1
Cricosia Cooper, 1973:384
Crinisarina Cooper and Dutro, 1982:92
Crinistrophia Havlicek, 1967:134
Criopus Poli, 1791:34 [=Crania]
Crispella Kozlowski, 1929 [replaced by Howellella]
Cristicoma Popov, 1980, in Nazarov and Popov, 1980:89
Cristiferina Cooper, 1956:961 [=Paucicrura]
Cromatrypa Havlicek, 1987:240
Crossacanthia Gordon, 1966:581
Crossalosia Muir(c)Wood and Cooper, 1960:76
Crossiskenidium Williams and Curry, 1985:238
Crozonorthis Melou, 1976:700
Cruralella Xian, 1980 [nomen nudum]
Cruralina Smirnova, 1966:32
Cruricella Grant, 1976:187
Cruricoelia Sykes, 1964 [nomen nudum]
Crurirhynchia Dagys, 1961:96
Crurispina Goldman and Mitchell, 1990:95
Crurithyris George, 1931:43
Cryopus Deshayes, 1836 [misspelling of Criopus]
Cryptacanthia White and St. John, 1867:119
Cryptatrypa Siehl, 1962:196
Cryptonella Hall, 1861:101
Cryptonema Bigsby, 1868 [misspelling of Cryptonella]
Cryptopora Jeffreys, 1869:136
Cryptoporella Bitner and Pisera, 1979:71
Cryptorhynchia Buckman, 1914 [nomen nudum]; 1918:66
Cryptospira Laurie, 1991:100
Cryptospirifer Grabau, 1931:405
Cryptothyrella Cooper, 1942:233
Cryptothyris Bancroft, 1945:223
Cryptotreta Pelman, 1977:53
Ctenalosia Cooper and Stehli, 1955:470
Ctenochonetes Racheboeuf, 1976:52 [subgenus of Strophochonetes]
Ctenokoninckina Xu, 1978:283
Cubacula Lazarev, 1984:73
Cubanirhynchia Kamyschan, 1968:57
Cubanothyris Dagys, 1959:35
Cudmorella Allan, 1939:242
Cuersithyris Almeras and Moulan, 1982:32
Cumberlandina Boucot, 1975:371
Cuneirhynchia Buckman, 1914 [nomen nudum]; 1918:35
Cunolites Defrance, 1821 [nomen nudum]
Cuparius Ross, 1971:126
Cupularostrum Sartenaer, 1961:2
Curranella Chatterton, 1973 [error for Resserella]
Curticia Walcott, 1905:319
Curtirhynchia Buckman, 1914 [nomen nudum]; 1918:36
Cuspidatella Modzalevskaja, 1991:116
Cyclacantharia Cooper and Grant, 1969:7
Cycladigera Havlicek, 1971:230
Cyclocoelia Foerste, 1909:227
Cyclomyonia Cooper, 1956:975
Cyclorhina Hall and Clarke, 1893 [replaced by Callipleura]'(
0*„(„(∞∞'åCyclorhynchia Baranov, 1994:29
Cyclospira Hall and Clarke, 1893:146
Cyclothyris McCoy, 1844:150
Cyclus Barrande, 1879 [nomen nudum; =Paterula]
Cydimia Chatterton, 1973:131
Cymatorhynchia Buckman, 1914 [nomen nudum]; 1918:53
Cymbidium Kirk, 1926:3
Cymbistropheodonta Harper and Boucot, 1978:38
Cymbithyris Cooper, 1952:5
Cymbricia Roberts, 1990, in Roberts and Jell, 1990:272
Cymoproductus Xu, 1987:227 
Cymostrophia Caster, 1939:39
Cyndalia Grant, 1993:55
Cyphomena Cooper, 1956:841
Cyphomenoidea Cocks, 1968:316 [subgenus of Cyphomena]
Cyphotalosia Carter, 1967:282
Cyphoterorhynchus Sartenaer, 1964:55
Cyranoia Cooper, 1983:185
Cyrbasiotreta Williams and Curry, 1985:208 
Cyrolexis Grant, 1965:89
Cyrtaena Hall, 1867 [misspelling of Cyrtina]
Cyrtalosia Termier and Termier, 1970:455
Cyrtella Fredericks, 1924:312
Cyrtia Dalman, 1828:92
Cyrtina Davidson, 1858:66
Cyrtinaella Fredericks, 1916:18
Cyrtinaellina Fredericks, 1926:414 [=Cyrtina]
Cyrtinaria Ljaschenko, 1985 [nomen nudum]
Cyrtinoides Yudina and Rzonsnitskaja, 1985:82
Cyrtinopsis Scupin, 1896:247
Cyrtinopsis Fredericks, 1916 [replacement by Davidsonella Fredericks invalid, Davidsonella preoccupied; replaced by Davidsonina]
Cyrtiopsis Grabau, 1923:194
Cyrtiorina Cooper and Dutro, 1982:111
Cyrtoniscus Boucot and Harper, 1968:172
Cyrtonotella Schuchert and Cooper, 1931:243
Cyrtonotreta Holmer, 1989:93
Cyrtospirifer Nalivkin, 1924, in Fredericks, 1924:312
Cyrtotheca Bittner, 1890 [replaced by Thecocyrtella]
Cyrtothyris Middlemiss, 1959:123
Cystothyris Sun, 1981:223
Dabashanospira Fu, 1979 [nomen nudum]; 1982:171
Dabashanospira Fu, 1982:171
Dactylogonia Ulrich and Cooper, 1942:624
Dactylotreta Rowell and Henderson, 1978:3
Daghanirhynchia Muir(c)Wood, 1935:82
Dagnachonetes Afanasjeva, 1978:66
Dagysorhynchia Smirnova, 1994:34
Dagyspirifer Hoover, 1991:77
Dalaia Plodowski, 1968:256
Dalejina Havlicek, 1953:5 [=Mendacella]
Dalejodiscus Havlicek, 1961:449 [=Plectodonta]
Dalerhynchus Bai, 1978, in Yoh and Bai, 1978:54
Dalinuria Lee and Gu, 1976:245
Dalligas Steinich, 1968:336
Dallina Beecher, 1893:382
Dallinella Thomson, 1915:75
Dallithyris Muir(c)Wood, 1959:303
Dalmanella Hall and Clarke, 1892:205
Dalmanellopsis Khalfin, 1948:208 [=Levenea]
Danella Pajaud, 1966:70
Danocrania Rosenkrantz, 1964:515 [subgenus of Crania]
Danzania Pavlova, 1988:55
Dareithyris Siblik, 1991:171
Darvasia Licharew, 1934:213
Dasyalosia Muir(c)Wood and Cooper, 1960:77
Dasysaria Cooper and Grant, 1969:9
Datangia Yang, 1977:369; 1978:122; 1978:268
Davanirhynchia Ovtsharenko, 1983:42 
Davidsonella Waagen, 1885 [replaced by Lakhmina]
Davidsonella Munier(c)Chalmas, 1880:279
Davidsonella Fredericks, 1926 [invalid new name for Cyrtinopsis Fredericks, 1916, Davidsonella preoccupied; replaced by Davidsonina]
Davidsonia Bouchard, 1849:92
Davidsoniatrypa Lenz, 1968:182
Davidsonina Schuchert and LeVene, 1929:120 [new name for Davidsonella Fredericks, 1926]
Daviesiella Waagen, 1884:613
Davoustia Racheboeuf, 1976:68
Dawsonelloides Boucot and Harper, 1968:165
Daya Koken, 1896 [misspelling of Dayia]'(0*„(„(∞∞'åDayia Davidson, 1881:291
Dearbornia Walcott, 1908:78 [=Acrothele]
Decoropugnax Havlicek, 1960:244
Decurtella Gaetani, 1966:344
Dedzetina Havlicek, 1950:33
Delepinea Muir(c)Wood, 1962:99
Deltachania Waterhouse, 1971, in Bamber and Waterhouse, 1971:217
Deltarhynchia Cooper, 1989:29
Deltarina Cooper and Grant, 1976:2012
Deltathyris Herrmannsen, 1846 [misspelling of Delthyris]
Deltatreta Ulrich, 1916 [nomen nudum]; 1926, in Butts, 1926:100 [=Polytoechia]
Delthiridaea Gray, 1848 [misspelling of Delthyridaea]
Delthyridaea McCoy, 1844 [nomen nudum]
Delthyridea Agassiz, 1846 [misspelling of Delthyridaea]
Delthyris Dalman, 1828:120
Deltorthis Ulrich, 1927 [nomen nudum; =Polytoechia]
Deltospirifer Wang and Rong, 1986:208
Demonedys Grant, 1976:66
Denckmannella Schuchert and LeVene, 1929 [new name for Denckmannia]
Denckmannia Holzapfel, 1908 [replaced by Macroplectane and Denckmannella]
Dengalosia Manankov and Pavlova, 1981:137
Densalvus Carter, 1991:88
Densepustula Lazarev, 1982:66
Dentatrypa Breivel, 1959 [=Vagrania]
Denticuliphoria Licharew, 1956, in Kiparisova et al., 1956:57
Dentospiriferina Dagys, 1965:109
Deothossia Gatinaud, 1949:488 [=Cyrtospirifer]
Derbyaeconcha Licharew, 1934, in Zittel, 1934:507
Derbyella Grabau, 1931:270
Derbyia Waagen, 1884:594
Derbyina Grabau, 1931 [replaced by Grabauellina]
Derbyina Clarke, 1913:212
Derbyoides Dunbar and Condra, 1932:115
Dereta Elliott, 1959:147
Desatrypa Copper, 1964:363
Desistrophia Talent, 1988, in Gratsianova, Schischkina & Talent, 1988:97 
Desmoinesia Hoare, 1960:226
Desmorthis Ulrich and Cooper, 1936:624
Desquamatia Alekseeva, 1960:421
Destombesium Havlicek, 1971:58
Devonalosia Muir(c)Wood and Cooper, 1960:84
Devonamphistrophia Harper and Boucot, 1978:159
Devonaria Biernat, 1966:77 [subgenus of Eodevonaria]
Devonochonetes Muir(c)Wood, 1962:43
Devonogypa Havlicek, 1951:3
Devonoproductus Stainbrook, 1943:55
Diabolirhynchia Drot, 1964:111
Diambonia Cooper and Kindle, 1936:356
Diambonioidea Zeng, 1987:230
Diandongia Rong, 1974:113
Diaphelasma Ulrich and Cooper, 1936:629
Diaphragmus Girty, 1910:218
Diazoma Durkoop, 1970:195
Dicaelosia King, 1850 [misspelling of Dicoelosia]
Dicamara Hall and Clarke, 1893:73
Dicamaropsis Amsden, 1968:85
Dicellomus Hall, 1871:3
Diceromyonia Wang, 1949:35
Dichacaenia Cooper and Dutro, 1982:50
Dichospirifer Brice, 1970:192
Dichotomosella Tchoumatchenco, 1987:51 [subgenus of Lacunosella]
Dichozygopleura Renouf, 1972:121
Diclipsites Rafinesque, 1831 [incertae sedis]
Diclisma Rafinesque, 1831 [incertae sedis]
Dicoelosia King, 1850:106
Dicoelospirifer Zhang, 1989:18
Dicoelostrophia Wang, 1955:351
Dicondylotreta Mei, 1993:410
Dicraniscus Meek, 1872:280 [=Triplesia]
Dicrosia Cooper, 1978:12
Dictyobolus Williams and Curry, 1985:189
Dictyoclostoidea Wang and Ching, 1964, in Wang et al., 1964:265
Dictyoclostus Muir(c)Wood, 1930:103
Dictyonathyris Xu, 1978:287
Dictyonella Hall, 1867:274 [replaced by Eodictyonella]
Dictyonina Cooper, 1942:228 [new name for Iphidella Walcott, 1912]
Dictyonites Cooper, 1956:187
Dictyostrophia Caster, 1939:42 [=Megastrophia]'(0*„(„(∞∞'åDictyothyris Douville, 1879:267
Dictyothyropsis Barczyk, 1969:66
Dicystoconcha Termier, Termier, Lapparent, and Marin, 1974:123
Didymelasma Cooper, 1956:615
Didymoparcium Lenz, 1977:62
Didymospira Salomon, 1895 [a group term, not generic]
Didymothyris Rubel and Modzalevskaja, 1967:238
Diedrothyris Richardson, 1980:48 
Dielasma King, 1859:260
Dielasmella Weller, 1911:447
Dielasmina Waagen, 1882:359
Dielasmoides Weller, 1911:444 [=Dielasma]
Dienerella Reed, 1931 [=Waagenites]
Dienerina Ozaki, 1931 [=Elivina]
Dienope Cooper, 1983:72
Dierisma Ching, Sun, and Ye, 1979:133
Diestothyris Thomson, 1916:504
Digitia Gregorio, 1930:32 [=Leptodus]
Dignomia Hall, 1871:2 [nomen nudum]; 1872, plate 13
Digonella Muir(c)Wood, 1934:550
Dihelictera Copper, 1995:855
Diholkorhynchia Yang and Xu, 1966:24
Dilophosina Cooper, 1983:187
Dimegelasma Cooper, 1942:232
Dimensionaequalirostrum Sartenaer, 1980:2
Dimerella Zittel, 1870:222
Dinapophysia Maillieux, 1935:5 [=Straelenia]
Dinarella Bittner, 1892:25
Dinarispira Dagys, 1974:131
Dinobolus Hall, 1871:4
Dinorthis Hall and Clarke, 1892:195 [subgenus of Plaesiomys]
Diochthofera Potter, 1990:59
Dionaegiria Havlicek, 1990, in Havlicek and Storch, 1990:65 [jun. obj. syn. of Jonesea Cocks & Rong, 1989]
Dioristella Bittner, 1890:299
Diorthelasma Cooper, 1956:997
Diorthis Kobayashi, 1937 [nomen nudum; =Dinorthis]
Diparelasma Ulrich and Cooper, 1936:623
Diphyites Schroeter, 1779; Hermannsen, 1846 [nombinomial]
Diplanus Stehli, 1954:299
Diplonorthis Mitchell, 1977:30
Diplospirella Bittner, 1890:297
Dipunctatella Liang, 1980 [nomen nudum]
Dipunctella Liang, 1982, in Wang Guo(c)ping et al., 1982:228
Diraphora Bell, 1941:243
Dirinus McCoy, 1844:44
Discina Lamarck, 1819:237
Discinisca Dall, 1871:37
DiscinolepisWaagen, 1885:750 [=Schizopholis]
Discinopsis Matthew, 1892, in Hall and Clarke, 1892:106
Discomyorthis Johnson, 1970:84
Discotreta Ulrich and Cooper, 1936:619
Discradisca Stenzel, 1964:627
Disculina Deslongchamps, 1884:231
Disepta Zeng, 1983 [nomen nudum] 
Disphenia Grant, 1988:129
Dispiriferina Siblik, 1965:79
Dissoria Cooper, 1989:97
Disulcatella Fu, 1980:4(c)5; 1982:134; 1985:93
Ditreta Biernat, 1973:65
Divaricosta Cooper and Grant, 1969:11
Dixonella Gourvennec, 1989:132
Djindella Menakova, 1991:25
Dmitria Sidiachenko, 1961:80
Dmitrispirifer Ljaschenko, 1973:126
Dnestrina Nikiforova and Modzalevskaja, 1968:206
Doescherella Abramov and Grigorjewa, 1987:121 [new name for Crassispirifer]
Dogdathyris Baranov, 1994:31
Dogdoa Baranov, 1982:42
Doleroides Cooper, 1930:375
Dolerorthis Schuchert and Cooper, 1931:244
Dolichobrochus Cooper, 1983:73
Dolichomocelypha Liu, 1987:374
Dolichosina Cooper, 1983:228
Dolichozygus Cooper, 1983:253
Doloresella Sando, 1957:122
Domokhotia Abramov and Grigorjewa, 1983:130
Donalosia Lazarev, 1989:35 
Donella Rotai, 1931:29'(0*„(„(∞∞'åDongbaella Ching and Ye, 1979:127
Dongbeiispirifer Liu, 1977, in Liu and Huang, 1977:58
Dorashamia Sarytcheva, 1965, in Ruzhentsev and Sarytcheva, 1965:217
Dorsirugatia Lazarev, 1992, in Lazarev and Suur'suren, 1992:63
Dorsisinus Sanders, 1958, in Easton et al., 1958:53
Dorsoplicathyris Almeras, 1971:437
Dorsoscyphus Roberts, 1971:50
Dorytreta Cooper, 1956:666
Dotswoodia McKellar, 1970:19 [subgenus of Whidbornella]
Douvillina Oehlert, 1887, in Fischer, 1887:1282
Douvillinaria Stainbrook, 1945:23
Douvillinella Spriestersbach, 1925:432
Douvillinoides Harper and Boucot, 1978:152
Douvinella Ljaschenko, 1985:12
Dowhatania Waterhouse and Gupta, 1979:127
Drabodiscina Havlicek, 1972:231
Draborthis Marek and Havlicek, 1967:280
Drabovia Havlicek, 1950:45
Drabovinella Havlicek, 1950:50
Dracius Steinich, 1967:1146
Drahanorhynchus Havlicek, 1967:203
Drahanostrophia Havlicek, 1967:202
Drepanorhyncha Cooper, 1956:627
Droharhynchia Sartenaer, 1985:218
Druganirhynchia Tchoumatchenco, 1983:70
Drummuckina Bancroft, 1949:12 [=Strophomena]
Duartea Mendes, 1959:59
Dubaria Termier, 1936:1266
Dubioleptina Havlicek, 1967:70
Dulankarella Rukavischnikova, 1956:135 [=Leptestina]
Dundrythyris Almeras, 1971:189
Durranella Percival, 1979:96
Duryeella Boucot, 1975:370
Dushanirhynchia Wang and Zhu, 1979:42
Dyctionella Oehlert, 1887 [misspelling of Dictyonella]
Dyoros Stehli, 1954:312
Dyschrestia Grant, 1976:101
Dyscolia Fischer and Oehlert, 1890:71
Dyscritosia Cooper, 1982:22
Dyscritothyris Cooper, 1979:15
Dysedrosia Cooper, 1983:256
Dysoristus Bell, 1944, in Lochman and Duncan, 1944:146
Dysozistus Gorjansky, 1960 [misspelling of Dysoristus]
Dysprosorthis Rong, 1984:133
Dyticospirifer Johnson, 1966:1043
Dzhagdicus Sobolev, 1992:107
Dzhangirhynchia Ovtsharenko, 1983:71
Dzharithyris Ovtsharenko, 1989:96
Dzhebaglina Misius, 1986:169
Dzieduszyckia Siemiradzki, 1909:85
Dzirulina Nutsubidze, 1945:188
Dzunarzina Ushatinskaia, 1993:115
Eastirhynchia Smirnova, 1984 [nomen nudum] 
Eatonia Hall, 1857:90
Eatonioides McLearn, 1918:138
Eccentricosta Berdan, 1963:254
Echinalosia Waterhouse, 1967:167 [new name for Multispinula Waterhouse, 1966]
Echinaria Muir(c)Wood and Cooper, 1960:248
Echinauris Muir(c)Wood and Cooper, 1960:222
Echinirhynchia Childs, 1969:73 [subgenus of Acanthorhynchia]
Echinocoelia Cooper and Williams, 1935:844
Echinocoeliopsis Hamada, 1968:17
Echinoconchella Lazarev, 1985:70 
Echinoconchus Weller, 1914:138
Echinospirifer Ljaschenko, 1973:109
Echinosteges Muir(c)Wood and Cooper, 1960:102
Echyrosia Cooper, 1989:30
Ecnomiosa Cooper, 1977:129
Ectatoglossa Chu, 1974:419 
Ectenoglossa Sinclair, 1945:63
Ectochoristites Campbell, 1957:71
Ectoposia Cooper and Grant, 1976:2898
Ectorensselandia Johnson, 1973:1105
Ectorhipidium Boucot and Johnson, 1979:102 [subgenus of Rhipidium]
Ectorhipidium Boucot, 1975 [nomen nudum]; =Ectorhipidium Boucot and Johnson, 1979]
Ectyphoria Cooper, 1989:79 
Edreja Koneva, 1979:49
Edriosteges Muir(c)Wood and Cooper, 1960:103'(0*„(„(∞∞'åEhlersella Boucot and Johnson, 1966:569
Eichwaldia Billings, 1858:192
Eifelatrypa Copper, 1973:497
Eifyris Struve, 1992:561 [subgenus of Athyris]
Eilotreta Amsden, 1968:36 [subgenus of Onychotreta]
Ejnespirifer Fu, 1982:177
Elasmata Waterhouse, 1982:349
Elasmothyris Cooper, 1956:984
Elassonia Cooper and Grant, 1976:1935
Elderra Richardson, 1991:38
Elegesta Vladimirskaya, 1985, in Kulkov, Vladimirskaya, and Rybkina, 1985:66 
Elenchus Aleksandrov, 1973:118
Eleutherocrania Huene, 1899:212
Eleutherokomma Crickmay, 1950:219
Elina Fredericks, 1924 [replaced by Elinoria]
Elinoria Cooper and Muir(c)Wood, 1951:195 [new name for Elina; =Brachythyrina]
Eliorhynchus Sartenaer, 1987:142
Elita Fredericks, 1918:87
Eliva Fredericks, 1924:319
Elivella Fredericks, 1924:316
Elivina Fredericks, 1924:314 [=Spiriferella]
Elkania Ford, 1886:325 [new name for Billingsia]
Elkanisca Havlicek, 1982:51
Ella Fredericks, 1918:87
Ellesmerhynchia Brice, 1990:717
Elliottella Stehli, 1955:711 [new name for Psilonotus]
Elliottina Pajaud, 1963:996
Ellipsothyris Sahni, 1925:371 [=Carneithyris]
Elliptoglossa Cooper, 1956:242
Elliptostrophia Havlicek, 1963:225
Elmaria Nalivkin, 1947:133; 1951:28
Elsaella Alichova, 1960:192 [new name for Bekkerella Rosenstein, 1943; =Heterorthina]
Elymospirifer Wang, 1974, in Wang et al., 1974:40
Elyta Ivanova, 1960 [misspelling of Elita]
Elytha Fredericks, 1924 [misspelling of Elita]
Elythyna Rzonsnitzkaja, 1952:61
Emanuella Grabau, 1923:192
Embolosia Cooper, 1983:229 
Emeithyris Xu, 1978:301
Enallosia Cooper and Grant, 1976:2859
Enallothecidea Baker, 1983:664
Enantiosphen Whidborne, 1893:97
Enantiosphenella Johnson, 1974:67
Enchondrospirifer Brice, 1970:175
Encuclodema Foerste, 1912 [invalid new name for Cyclocoelia, Cyclocoelia not preoccupied]
Endospirifer Tachibana, 1981:36
Engenella Andreeva, 1987:36
Enigmalosia Czarniecki, 1969:272
Enodithyris Smirnova, 1986, in Smirnova and Konovalov, 1986:79 
Ense Struve, 1992:612
Entacanthadus Grant, 1993:13
Enteles Schellwien, 1892; Clark, 1903 [misspelling of Enteletes]
Enteletella Licharew, 1926:719
Enteletes Fischer de Waldheim, 1825:6
Enteletina Schuchert and Cooper, 1931:247
Enteletoides Stuckenberg, 1905:60
Eoamphistrophia Harper and Boucot, 1978:154
Eoanastrophia Nikiforova and Sapelnikov, 1973:65
Eoantiptychia Xu and Liu, 1983:97
Eobiernatella Balinski, 1995:138
Eobrachythyrina Lazarev and Poletaev, 1982:92
Eobrachythyris Brice, 1970:182
Eochonetes Reed, 1917:915
Eochoristitella Qi, 1983, in Zhang, Fu and Ding, 1983:406
Eochoristites Chu, 1933:29
Eocoelia Nikiforova, 1961, in Nikiforova and Andreeva, 1961:252
Eoconcha Cooper, 1951:4
Eoconchidium Rozman, 1967:62
Eoconulus Cooper, 1956:283
Eocramatia Williams, 1974:129
Eocymostrophia Baarli, 1995:48
Eodallina Elliott, 1959:146
Eodalmanella Havlicek, 1950:24
Eodevonaria Breger, 1906:534
Eodictyonella Wright, 1994:908 [new name for Dictyonella Hall]
Eodinobolus Rowell, 1963:37
Eodiorthelasma Xu and Liu, 1984:188
Eodmitria Brice, 1982:575 '(_0*„(„(∞∞'åEoglossinotoechia Havlicek, 1959:81
Eogryphus Hertlein and Grant, 1944:89
Eohemithiris Hertlein and Grant, 1944:55
Eohemithyris Cooper, 1959 [rejected emendation of Eohemithiris]
Eohowellella Lopushinskaja, 1976:79
Eokarpinskia Rzonsnitzkaja, 1964:103
Eokirkidium Khodalevich and Sapelnikov, 1970:196
Eolaballa Liao and Meng, 1986:86 
Eolacazella Elliott, 1953:694
Eolissochonetes Hoare, 1960:220
Eolyttonia Fredericks, 1924:25
Eomaoristrophia Ushatinskaia, 1983, in Ushatinskaia and Alekseeva, 1983:38
Eomarginifera Muir(c)Wood, 1930:103
Eomarginiferina Brunton, 1966:230 [subgenus of Eomarginifera]
Eomartiniopsis Sokolskaja, 1941:78
Eomegastrophia Cocks, 1967:260 [subgenus of Megastrophia]
Eonalivkinia Vladimirskaya, 1978 [nomen nudum]
Eonalivkinia Vladimirskaya, 1985, in Kulkov, Vladimirskaya, and Rybkina, 1985:155 
Eoobolus Matthew, 1902:97 [=Obolus]
Eoorthis Walcott, 1908:103
Eoparaphorhynchus Sartenaer, 1961:2
Eopentamerifera Boucot, 1975 [nomen nudum]
Eoperegrinella Ager, 1968:61
Eopholidostrophia Harper, Johnson, and Boucot, 1967:411
Eoplectodonta Kozlowski, 1929:30
Eoplicanoplia Boucot and Harper, 1968:168
Eoplicoplasia Johnson and Lenz, 1992:530
Eoprodavidsonia Menakova, 1982 [nomen nudum] 
Eoproductella Rzonsnitzkaja, 1980:59 
Eopugnax Baranov, 1991:37
Eopunctata Zeng, 1983 [nomen nudum]
Eoreticularia Nalivkin, 1924, in Fredericks, 1924:314 [=Reticulariopsis]
Eorhipidomella Hints, 1971:266
Eorhynchula Liang, 1983, in Liu, Xu, and Liang, 1983:284 
Eoscaphelasma Koneva, Popov, and Ushatinskaia, 1990, in Koneva, Popov, Ushatinskaia, and Esakova, 1990:164
Eoschizophoria Rong and Yang, 1980:269 [subgenus of Schizophoria]
Eoschuchertella Gratsianova, 1974:83
Eoseptaliphoria Ching and Sun, 1976, in Ching et al., 1976:294
Eosericoidea Zeng, 1987:228
Eosiphonotreta Havlicek, 1982:57
Eosophragmophora Wang, 1974, in Wang et al., 1974:36
Eosotrematorthis Wang, 1955:336
Eospinatrypa Copper, 1973:496
Eospirifer Schuchert, 1913, in Zittel, 1913:411
Eospiriferina Grabau, 1931:494
Eospirigerina Boucot and Johnson, 1967:90 [subgenus of Spirigerina]
Eostrophalosia Stainbrook, 1943:58
Eostropheodonta Bancroft, 1949:9 [subgenus of Strophodonta]
Eostrophia Ulrich and Cooper, 1936 [replaced by Cambrotrophia]
Eostrophomena Walcott, 1905:256
Eostrophonella Williams, 1950:282 [subgenus of Strophonella]
Eosyntrophopsis Yadrenkina, 1989:77
Eosyringothyris Stainbrook, 1943:431
Eothecidellina Baker, 1991:816
Eothele Rowell, 1980:17
Eousella Ovtsharenko, 1976:26
Epacroplecia Williams, 1962 [=Craigella]
Epacrosina Cooper, 1983:256
Epelidoaegiria Strusz, 1982:115 [subgenus of Aegiria]
Ephippelasma Cooper, 1956:261
Epicelia Grant, 1972:224
Epicyrta Deslongchamps, 1884:275
Epithyris Phillips, 1841:55
Epithyroides Xu, 1978:306
Epithyrus Paetel, 1875 [misspelling of Epithyris]
Epitomyonia Wright, 1968:128
Equirostra Cooper and Muir(c)Wood, 1951:195 [new name for Isorhynchus; subgenus of Porambonites]
Erbotreta Holmer & Ushatinskaia, 1994:207
Erectocephalus Xian, 1978:334
Eremithyris Brugge, 1973:197
Eremotoechia Cooper, 1956:513
Eremotrema Cooper, 1956:960
Ericiatia Muir(c)Wood and Cooper, 1960:172
Eridmatus Branson, 1966:75
Eridorthis Foerste, 1909:223
Erinostrophia Cocks and Worsley, 1993:44
Eripnifera Potter, 1990:108
Erismatina Waterhouse, 1983:117 '(_0*„(„(∞∞'åEristenosia Cooper, 1983:78
Errhynx Havlicek, 1982:112
Erymnaria Cooper, 1959:64
Erymnia Cooper, 1977:92
Eschatelasma Popov, 1981:34
Esilia Nikitin and Popov, 1985:38
Espella Nilova, 1965:102
Estlandia Schuchert and Cooper, 1931:245
Estonirhynchia Schmidt, 1954:236
Estonomena Roomusoks, 1989:113
Etheridgina Oehlert, 1887, in Fischer, 1887:1278
Etherilosia Archbold, 1993:11 [subgenus of Heteralosia]
Etymothyris Cloud, 1942:59
Eucalathis Fischer and Oehlert, 1890:72
Eucharitina Schmidt, 1955:121
Eudesella Munier(c)Chalmas, 1880:279
Eudesia King, 1850:144
Eudesites Rioult, 1966:74
Eudoxina Fredericks, 1929:382
Euidothyris Buckman, 1915 [nomen nudum]; 1918:101
Eumetabolotoechia Sartenaer, 1975:3
Eumetria Hall, 1863:59
Eunella Hall and Clarke, 1893:290 [=Cranaena]
Eunoa Clarke, 1902 [replaced by Oxlosia]
Euobolus Mickwitz, 1896 [=Obolus]
Euorthisina Havlicek, 1950:16
Euproductus Whitehouse, 1928 [=Linoproductus]
Euractinella Bittner, 1890:303
Eurekaspirifer Johnson, 1966:1045
Eurhynchonella Leidhold, 1920 [=Rhynchonella]
Euritatospirifer Simakov, 1984 [nomen nudum]
Euroatrypa Oradovskaya, 1982, in Nikiforova, Oradovskaya, and Popov, 1982:63 
Eurycolporhynchus Sartenaer, 1968:566
Eurypthyris Ovtsharenko, 1983:117
Eurysina Cooper, 1983:259
Eurysites Cooper, 1989:32
Eurysoria Cooper, 1983:189 
Euryspirifer Wedekind, 1926:202
Eurytatospirifer Gatinaud, 1949:487 [=Cyrtospirifer]
Eurythyris Cloud, 1942:63
Eurytreta Rowell, 1966:9
Euterebratula Makridin, 1954 [nomen nudum]
Euthyris Quenstedt, 1869 [rejected name proposed to replace Athyris]
Euxinella Moisseiev, 1936:41
Evanescirostrum Sartenaer, 1965:8
Evanidisinurostrum Sartenaer, 1987:135
Evargyrotheca MacKinnon and Smirnova, 1995:676
Evenkina Andreeva, 1961, in Nikiforova and Andreeva, 1961:96
Evenkinorthis Yadrenkina, 1977:27
Evenkorhynchia Rozman, 1969:102
Exatrypa Copper, 1967:123 [subgenus of Spinatrypina]
Excavatorhynchia Jin and Fang, 1977:44
Exceptothyris Sucic(c)Protic, 1971:37
Expellobolus Havlicek, 1982:25
Experilingula Koneva and Popov, 1983:113
Fabulasteges Liang, 1990:381
Faksethyris Asgaard, 1971:385
Falafer Grant, 1972:217
Falciferula Tchoumatchenco, 1987:56
Fallax Atkins, 1960:72
Fallaxispirifer Su, 1976:226
Fallaxoproductus Lee, Gu, and Li, 1982:115 
Falsatrypa Havlicek, 1956:584
Famatinorthis Levy and Nullo, 1973:146
Fanichonetes Xu and Grant, 1994:29
Fardenia Lamont, 1935:311
Farmerella Clarke, 1992:73
Fascicoma Popov, 1980, in Nazarov and Popov, 1980:92 
Fascicosta Stehli, 1955:71
Fascicostella Schuchert and Cooper, 1931:246
Fasciculina Cooper, 1952:7
Fascifera Ulrich and Cooper, 1942:620
Fascistropheodonta Harper and Boucot, 1978:24
Fascizetina Havlicek, 1975:232
Fehamya Mergl, 1983:340
Felinotoechia Havlicek, 1961:73
Fenestrirostra Cooper, 1955:57
Fengzuella Li and Han, 1980:17'(_0*„(„(∞∞'åFenxiangella Wang, 1978:224
Ferganella Nikiforova, 1937:77
Ferganoproductus Galitzkaja, 1977:33
Fernglenia Carter, 1992:329
Ferrax Havlicek, 1975:231
Ferrobolus Havlicek, 1982:71
Ferrythyris Almeras, 1971:218
Fezzanoglossa Havlicek, 1973, in Havlicek and Massa, 1973:273
Ffynnonia Neuman and Bates, 1978:592
Fibulistrophia Garcia(c)Alcalde, 1972:43
Fidespirifer Ljaschenko, 1973:129
Filiatrypa Chen, 1983:309
Filiconcha Dear, 1969:299
Filigreenia Soja, 1988:156 
Fimbriaria Muir(c)Wood and Cooper, 1960 [replaced by Fimbrinia]
Fimbrinia Cooper, 1972:450 [new name for Fimbriaria]
Fimbriothyris Deslongchamps, 1884:273
Fimbrispirifer Cooper, 1942:231
Finkelnburgia Walcott, 1905:277
Finospirifer Ying, 1979 [nomen nudum]
Finospirifer Yin, 1981:236 
Fissirhynchia Pearson, 1977:48
Fissirostra Orbigny, 1847 [misspelling of Fissurirostra]
Fissurirostra Orbigny, 1847:269 [=Trigonosemus]
Fistulogonites Neuman, 1971:117
Fitzroyella Veevers, 1959:104
Flabellirhynchia Buckman, 1914 [nomen nudum]; 1918:65
Flabellocyrtia Chorowicz and Termier, 1975:235
Flabellothyris Deslongchamps, 1884:263
Flabellulirostrum Sartenaer, 1971:5
Fletcherina Stehli, 1961 [replaced by Fletcherithyris]
Fletcherithyris Campbell, 1965:24 [new name for Fletcherina]
Fletcherithyroides Dagys, 1977:14
Flexaria Muir(c)Wood and Cooper, 1960:259
Flexathyris Grunt, 1980:61 
Floweria Cooper and Dutro, 1982:54
Fluctuaria Muir(c)Wood and Cooper, 1960:304
Foliomena Havlicek, 1952:413
Fordinia Walcott, 1908:65
Forma Gregorio, 1930:28
Formosarhynchia Seifert, 1963:177
Fortunella Calzada, 1985:78
Fossatrypa Mizens and Rzonsnitzkaja, 1979:62 [subgenus of Munieratrypa]
Fossuliella Popov and Ushatinskaia, 1992:66
Fosteria Zezina, 1980:26
Foveola Gorjansky, 1969:30
Frankiella Racheboeuf, 1983:607
Franklinella Lenz, 1973:1405
Frechella Legrand(c)Blain, 1986:32
Fredericksia Paeckelmann, 1931:48 [new name for Munia]
Frenula Dall, 1871:55 [=Macandrevia]
Frenulina Dall, 1895:724
Frieleia Dall, 1895:714
Fulcriphoria Carls, 1974:176
Furcirhynchia Buckman, 1914 [nomen nudum]; 1918:59
Furcitella Cooper, 1956:876
Fusella McCoy, 1844:128
Fusichonetes Liao, 1979 [nomen nudum]; 1981:52
Fusichonetes Liao, 1981, in Zhao, Sheng et al., 1981:53
Fusiproductus Waterhouse, 1975:12
Fusirhynchia Dagys, 1968:68
Fusispirifer Waterhouse, 1966:43
Gacella Williams, 1962:222
Gacina Stehli, 1961:458
Gagriella Moisseiev, 1939:193 [=Kolhidaella]
Galateastrophia Harper and Boucot, 1978:25
Galeatagypa Sapelnikov, 1981:11 [subgenus of Gypidula]
Galeatathyris Jin, 1983:230
Galeatella Sapelnikov and Rukavischnikova, 1975 [replaced by Galeatellina]
Galeatella Muir(c)Wood and Cooper, 1960:174
Galeatellina Sapelnikov and Rukavischnikova, 1976:122 [new name for Galeatella Sapelnikov and Rukavischnikova, 1975]
Galinella Popov and Holmer, 1994:108
Galliennithyris Rollet, 1966:304
Gamdaella Miloradovich, 1947:92
Gamonetes Isaacson, 1977:168
Gamphalosia Stainbrook, 1945:33
Gannania Fu, 1979 [nomen nudum]; 1982:168
Gannania Fu, 1982:168; 1984:376'(0*„(„(∞∞'åGasconsia Northrop, 1939:161
Gashaomiaoia Rong, Su, and Li, 1985:34 [subgenus of Gypidula]
Gaspesia Clarke, 1907:277
Gastrodetoechia Sartenaer, 1965:2
Gatia Archbold, 1993:4
Gefonia Licharew, 1936:264
Gegenella Lee and Gu, 1976:237
Geinitzia Hall, 1889 [nomen nudum; =Conotreta]
Gelidorthina Havlicek, 1974:168
Gelidorthis Havlicek, 1968:125
Gemerithyris Siblik, 1977:203
Geminisulcispirifer Sartenaer, 1982:149 [subgenus of Cyrtospirifer]
Gemmarcula Elliott, 1947:145
Gemmellaria Fabiani and Ruiz, 1933 [invalid new name for Canavaria, Gemmellaria preoccupied; replaced by Sicelia]
Gemmellaroia Cossmann, 1898:77 [new name for Megarhynchus]
Gemmellaroiella Mabuti, 1937:16 [=Gemmellaroia]
Gemmulicosta Waterhouse, 1971, in Bamber and Waterhouse, 1971:210
Geniculifera Muir(c)Wood and Cooper, 1960:187
Geniculina Roomusoks, 1993:53
Geniculomclearnites Harper and Boucot, 1978:132 [subgenus of Mclearnites]
Genuspirifer Liang, 1990:389
Georgethyris Minato, 1953:68
Geranocephalus Crickmay, 1954:157
Gerassimovia Licharew, 1956, in Kiparisova et al., 1956:59
Gerkispira Carter, 1983:72 
Gerolsteinites Struve, 1990:268
Gerothyris Struve, 1970:537
Gerrhynx Baranov, 1991:40
Geyerella Schellwien, 1900:12
Geyeria Carapezzi and Schopen, 1899 [replaced by Carapezzia]
Gibberostrophia Harper and Boucot, 1978:79
Gibbirhynchia Buckman, 1914 [nomen nudum]; 1918:43
Gibbithyrella Ovtsharenko, 1989:87
Gibbithyris Sahni, 1925:372
Gibbochonetes Aisenverg, 1971:70 [subgenus of Delepinea]
Gibbospirifer Waterhouse, 1971, in Bamber and Waterhouse, 1971:221
Gigantella Sarytcheva, 1928 [replaced by Gigantoproductus]
Gigantoproductus Prentice, 1950:437 [new name for Gigantella]
Gigantorhynchus Sapelnikov and Malygina, 1977:62
Gigantothyris Seifert, 1963:180
Gilledia Stehli, 1961:451
Giraldibella Havlicek, 1977:87
Giraldiella Bancroft, 1949:5
Girlasia Gregorio, 1930:21
Girtyella Weller, 1911:443
Gisilina Steinich, 1963:735
Gissarina Menakova and Nikiforova, 1986:71 
Gjelispinifera Ivanova, 1975:86
Glabrichonetina Waterhouse, 1978:130
Glabrigalites Struve, 1992:547 [subgenus of Devonogypa]
Glaciarcula Elliott, 1956:285
Gladiostrophia Havlicek, 1967:141
Glaphyrorthis Roberts, 1990, in Roberts and Jell, 1990:278
Glassia Davidson, 1881:11
Glassina Hall and Clarke, 1893:97
Glazewskia Pajaud, 1964 [nomen nudum]; 1964:260
Glendonia McClung and Armstrong, 1978:2
Globatrypa Mizens and Sapelnikov, 1985, in Mizens, 1985:10 [subgenus of Atrypoidea]
Globidorsum Jin, 1988:215
Globiella Muir(c)Wood and Cooper, 1960:305
Globirhynchia Buckman, 1914 [nomen nudum]; 1918:48
Globispirifer Tachibana, 1964:37
Globithyris Cloud, 1942:82
Globosobucina Waterhouse and Piyasin, 1970:123
Globosochonetes Brunton, 1968:48
Globosoproductus Litvinovich and Vorontsova, 1983:88 
Globulirhynchia Brice, 1980:149
Glossella Cooper, 1956:228
Glosseudesia Lobatscheva, 1974:146
Glosshypothyridina Rzonsnitzkaja, 1978:180
Glossina Phillips, 1848 [replaced by Palaeoglossa]
Glossinotoechia Havlicek, 1959:79 [subgenus of Glossinulus]
Glossinulina Johnson, 1975:958
Glossinulinirhynchia Baranov, 1991:41
Glossinulus Schmidt, 1942:394
Glossoleptaena Havlicek, 1967:115
Glossorthis Opik, 1930:82
Glossostrophia Williams, 1950 [=Leptodontella]'(0*„(„(∞∞'åGlossothiris Gregorio, 1891 [misspelling of Glossothyris]
Glossothyris Douville, 1879 [=Nucleata]
Glossothyropsis Girty, 1934:251
Glottidia Dall, 1870:157
Glyphisaria Cooper, 1983:84
Glyptacrothele Termier and Termier, 1974:45
Glyptambonites Cooper, 1956:713
Glypterina Boucot, 1970:984
Glyptias Walcott, 1901:675
Glyptoglossa Cooper, 1956 [replaced by Glyptoglossella]
Glyptoglossella Cooper, 1960:601 [new name for Glyptoglossa]
Glyptogypa Struve, 1992:549
Glyptomena Cooper, 1956:881
Glyptorhynchia Shen and He, 1994:448
Glyptoria Cooper, 1976:281
Glyptorthis Foerste, 1914:258
Glyptospirifer Hou and Xian, 1975:72
Glyptosteges Cooper and Grant, 1975:877
Glyptotrophia Ulrich and Cooper, 1936:627
Gmelinmagas Marinelarena, 1964:268
Gnamptorhynchos Jin, 1989:74
Gnathorhynchia Buckman, 1914 [nomen nudum]; 1918:29
Goleomixa Grant, 1976:180
Goliathyris Feldman and Owen, 1988:4 
Gonambonites Pander, 1830:77
Gonathyris Baranov, 1994:30
Gondolina Ching and Liao, 1966, in Wang et al., 1966:412
Goniarina Cooper and Grant, 1969:2
Goniclis Rafinesque, 1819; 1831 [nomina nuda]
Goniobrochus Cooper, 1983:260
Goniocoelia Hall, 1861:101 [=Pentagonia]
Goniophoria Janischewsky, 1910:81
Goniorhynchia Buckman, 1914 [nomen nudum]; 1918:52
Goniothyrella Tchorszhewsky, 1973; 1974 [nomina nuda]
Goniothyris Buckman, 1914 [nomen nudum]; 1918:117
Goniothyropsis Ovtsharenko, 1983:155
Goniotrema Ulrich and Cooper, 1936:626
Gonotrema Rafinesque, 1820 [nomen nudum]
Gorchakovia Popov and Khazanovitch, 1989:135
Gorgostrophia Havlicek, 1967:136
Gorjanskya Tenjakova, 1980:131
Gotatrypa Struve, 1966:129 [subgenus of Atrypa]
Gotlandia Dall, 1870 [new name for Trimerella, withdrawn by Dall in 1871]
Goungjunspirifer Zhang Feng(c)ming, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:346
Grabauellina Licharew, 1934, in Zittel, 1934:507 [new name for Derbyina Grabau, 1931; =Derbyia]
Grabauicyrtiopsis Gatinaud, 1949:490 [=Cyrtiopsis]
Grabauispirifer Gatinaud, 1949:413 [=Cyrtospirifer]
Gracianella Johnson and Boucot, 1967:868
Gracilotoechia Baranov, 1977:78
Graciospirifer Simakov, 1984 [nomen nudum] 
Grammetaria Cooper, 1959:58
Grammoplecia Wright and Jaanusson, 1993:104
Grammorhynchus Roberts, 1971:144
Grandaurispina Muir(c)Wood and Cooper, 1960:306
Grandiproductella Lazarev, 1987, in Lazarev and Simakov, 1987:121
Grandirhynchia Buckman, 1914 [nomen nudum]; 1918:40
Grandispirifer Yan, 1959:116 [=Unispirifer]
Grantonia Brown, 1953:60
Granulirhynchia Buckman, 1914 [nomen nudum]; 1918:64
Grasirhynchia Owen, 1968:19
Graticulatia Gupta and Waterhouse, 1979 [nomen nudum]
Gratiosina Grant, 1976 [=Transennatia]
Grayina Boucot, 1975:354
Grebenella Modzalevskaja and Beznosova, 1992:8
Greenfieldia Grabau, 1910, in Grabau and Sherzer, 1910:148
Greenockia Brown, 1952:91 [=Hemiplethorhynchus]
Greira Erlanger, 1993:120
Grorudia Spjeldnaes, 1957:61
Gruenewaldtia Tschernyschew, 1885:46
Grumantia Ustritsky, 1963, in Ustritsky and Tschernjak, 1963:70
Gruntallina Waterhouse and Gupta, 1986:51
Gryphus Megerle von Muhlfeld, 1811:64
Guangdongina Mou and Liu, 1989:457
Guangjiayanella Yang, 1984:212
Guangshunia Xian, 1978:318
Guangxiispirifer Xian, 1978:316
Guangxistrophia Xian, 1980 [nomen nudum]
Guaxa Garcia(c)Alcalde, 1986:67'(0*„(„(∞∞'åGubleria Termier and Termier, 1960:241
Guerichella Paeckelmann, 1913 [invalid new name for Adolfia, Adolfia not preoccupied]
Guerichia Wedekind, 1926 [nomen nullum; =Adolfia]
Guicyrtia Wang and Zhu, 1979:59
Guilinospirifer Xu and Yao, 1988:306 
Guistrophia Wang and Rong, 1986:110
Guizhouella Yang, 1978:124 [preoccupied by Kueichowella]
Gunnarella Spjeldnaes, 1957:149
Gunningblandella Percival, 1979:111
Gusarella Prosorovskaja, 1962:111
Guseriplia Dagys, 1963:107 [=Sinucosta]
Guttasella Neuman, 1977:31
Gwynia King, 1859:258
Gwyniella Johansen, 1987:26
Gypidia Dalman, 1828 [invalid name; =Pentamerus]
Gypidium Beyrich, 1837 [misspelling of Gypidia]
Gypidula Hall, 1867:163
Gypidulella Khodalevich and Breivel, 1959, in Khodalevich et al., 1959:26
Gypidulina Rzonsnitzkaja, 1956, in Kiparisova et al., 1956:49
Gypiduloides Savage and Baxter, 1995:1035
Gypospirifer Cooper and Grant, 1976:2210
Gyroselenella Li, 1985:581 [new name for Selenella Li, 1980]
Gyrosina Cooper, 1983:86
Gyrosoria Cooper, 1973:386
Gyrothyris Thomson, 1918:28
Habrobrochus Cooper, 1983:87
Hadrorhynchia McLaren, 1961:3
Hadrosia Cooper, 1983:195
Hadrotatorhynchus Sartenaer, 1986.:138
Hadrotreta Rowell, 1966:12
Hadyrhyncha Havlicek, 1979:98
Hagabirhynchia Jefferies, 1961, in Hudson and Jefferies, 1961:5
Hallina Winchell and Schuchert, 1892:292
Hallinetes Racheboeuf and Feldman, 1990:4
Halorella Bittner, 1884:107
Halorellina Xu, 1978:276
Halorelloidea Ager, 1960:159
Hamburgia Weller, 1911:446
Hamletella Hayasaka, 1953:92 [=Orthothetina]
Hamlingella Reed, 1943:78
Hampsia Morris, 1994:271
Hamptonina Rollier, 1919:360
Hanaeproductus Ficner and Havlicek, 1978:65
Hansotreta Krause and Rowell, 1975:46
Hanusitrypa Havlicek, 1967:443
Haplospirifer Lee and Gu, 1976:280
Harjumena Roomusoks, 1993:162
Harknessella Reed, 1917:862
Harmatosia Cooper, 1983:196
Harpidium Kirk, 1925:2
Harpotothyris Smirnova, 1990:53
Harringtonina Boucot, 1972, in Amos, 1972:10
Harttella Bell, 1929:149
Harttina Hall and Clarke, 1893:292 [=Romingerina]
Haupiria MacKinnon, 1983:101
Havlicekella Amsden, 1985:6
Havlicekia Boucot, 1963:693
Haydenella Reed, 1944:79
Haydenoides Chan, 1977:352; 1979, in Hou et al., 1979:82
Hebertella Hall and Clarke, 1892:198
Hebetoechia Havlicek, 1959:79
Hectoria Trechmann, 1918 [invalid new name for Clavigera, Hectoria preoccupied; replaced by Hectorina; Clavigera not preoccupied]
Hectorina Finlay, 1927 [invalid new name for Hectoria; Clavigera not preoccupied]
Hedeina Boucot, 1957:323
Hedeinopsis Gourvennec, 1990:142 
Hedstroemina Bancroft, 1929:58 [subgenus of Kjaerina]
Hefengia Xu, 1991:313 [subgenus of Leptaenopyxis]
Heimia Haas, 1890:87
Helaspis Imbrie, 1959:400
Helenaeproductus Lazarev, 1991, in Pavlova et al., 1991:117
Helenathyris Alekseeva, 1969:1157
Heligothyris Middlemiss, 1991:230
Heliomedusa Sun and Hou, 1987:261
Helmersenia Pander, 1861:48
Helvetella Owen, 1977:221
Hemichonetes Racheboeuf, 1979 [nomen nudum]; 1981 [replaced by Philippotia]
Hemichonetes Racheboeuf, 1981 [replaced by Philippotia]
Hemichonetes Lee and Su, 1980, in Lee, Gu, and Su, 1980:344'(0*„(„(∞∞'åHemileurus Cooper and Grant, 1976:2018
Hemiplethorhynchus Peetz, 1898:181
Hemipronites Pander, 1830:74 [subgenus of Clitambonites]
Hemiptychina Waagen, 1882:363
Hemistringocephalus Smirnov, 1985:31 
Hemithiris Orbigny, 1847:268
Hemithyris Bronn, 1848 [misspelling of Hemithiris]
Hemithyropsis Katz, 1974:254
Hemitoechia Nikiforova, 1970:103
Heosomocelypha Liu, 1987:372
Herangirhynchia MacFarlan, 1992:155
Hercosestria Cooper and Grant, 1969:7
Hercosia Cooper and Grant, 1969:8
Hercostrophia Williams, 1950:277
Hercothyris Cooper, 1979:25
Hercotrema Jin, 1989:87
Hergetatrypa Havlicek, 1987:97
Hesperinia Cooper, 1956:822
Hesperithyris Dubar, 1942:78
Hesperomena Cooper, 1956:744
Hesperonomia Ulrich and Cooper, 1936:621
Hesperonomiella Ulrich and Cooper, 1936:622
Hesperorhynchia Warren, 1937:2
Hesperorthis Schuchert and Cooper, 1931:244
Hesperosia Cooper, 1983:197
Hesperotrophia Ulrich and Cooper, 1936:630
Hessenhausia Struve, 1982:226 [new name for Rauffia] 
Heteralosia King, 1938:278
Heteraria Cooper and Grant, 1976:2276
Heterelasma Girty, 1909:337
Heterelasmina Licharew, 1939:120 [=Jisuina]
Heterobrochus Cooper, 1983:89
Heteromychus Cooper, 1989:41
Heterorthella Harper, Boucot, and Walmsley, 1969:79
Heterorthina Bancroft, 1928:59
Heterorthis Hall and Clarke, 1892:202
Hexarhytis Alvarez, 1990:157
Hibernodonta Harper and Mitchell, 1985:300 
Himalairhynchia Ching and Sun, 1976, in Ching et al., 1976:292
Himathyris Waterhouse, 1986:215 
Hindella Davidson, 1882:130
Hinganella Su, 1980:285
Hingganoleptaena Zhu, 1985:41
Hinniphoria Bronn, 1862 [misspelling of Hynniphoria]
Hipparionix Vanuxem, 1842:124
Hipparionyx Auctorum [improper emendation of Hipparionix by subsequent authors]
Hircinisca Havlicek, 1960:241
Hirnantia Lamont, 1935:313
Hirsutella Cooper and Muir(c)Wood, 1951:195 [new name for Hirsutina]
Hirsutina Kirchner, 1933 [replaced by Hirsutella]
Hiscobeccus Amsden, 1983:37
Hisingerella Henningsmoen, 1948, in Waern et al., 1948:388
Hispanirhynchia Thomson, 1927:159
Hispidaria Cooper and Dutro, 1982:110
Histosyrinx Massa, Termier, and Termier, 1974:168
Holcorhynchella Dagys, 1974:110
Holcorhynchia Buckman, 1914 [nomen nudum]; 1918:28
Holcospirifer Bassett, Cocks, and Holland, 1976:620
Holcothyris Buckman, 1915 [nomen nudum]; 1918:125
Hollardiella Drot, 1967:877
Hollardina Racheboeuf, Carls and Garcia(c)Alcalde, 1982:46 
Holorhynchus Kiaer, 1902:68
Holosia Cooper and Grant, 1976:1971
Holotricharina Cooper and Grant, 1975:1173
Holtedahlina Foerste, 1924:123
Holynatrypa Havlicek, 1973:339
Holynetes Havlicek and Racheboeuf, 1979:97
Homaliarhynchia Shi, 1990:306
Homeocardiorhynchus Sartenaer, 1985:220
Homevalaria Waterhouse, 1986:110
Homevalia Campbell, 1959 [error by Campbell, should be Ingelarella]
Homoeorhynchia Buckman, 1914 [nomen nudum]; 1918:36
Homoeospira Hall and Clarke, 1893:112
Homoeospirella Amsden, 1968:90
Homotreta Bell, 1941:230 [=Prototreta]
Hontorialosia Martinez, 1979:119
Hopkinsirhynchia Shi and Grant, 1993:63 [subgenus of Burmirhynchia]
Hoplotheca Bigsby, 1878 [misspelling of Anoplotheca]'(0*„(„(∞∞'åHorderleyella Bancroft, 1928:178
Horridonia Chao, 1927:24
Hoskingia Campbell, 1965:52
Hostimena Havlicek, 1990, in Havlicek and Storch, 1990:69
Hostimex Havlicek, 1982:370
Howellella Kozlowski, 1946:295 [new name for Crispella]
Howellites Bancroft, 1945:203
Howelloidea Su, 1980:314
Howittia Talent, 1956:34
Howseia Logan, 1963:756
Huacoella Benedetto and Herrera, 1993:44
Huananochonetes Wang, Boucot, and Rong, 1981:290
Huatangia Liao and Meng, 1986:78 
Hubeiproductus Yang, 1984:220
Huenella Walcott, 1908:109
Huenellina Schuchert and Cooper, 1931:247
Hulterstadia Wright, 1993:73
Humaella Zhu, 1982:53 
Hunanella Lee, 1939 [nomen nudum]
Hunanoproductus Hou, 1965:117
Hunanospirifer Tien, 1938:139 [=Cyrtospirifer]
Hunanotoechia Ma, 1993:717
Hungarispira Dagys, 1972:102
Hungaritheca Dagys, 1972:97
Hustedia Hall and Clarke, 1893:120
Hustedtiella Dagys, 1972:100
Hyatella Cossmann, 1898 [misspelling of Hyattella]
Hyattella Hall and Clarke, 1894 [replaced by Hyattidina]
Hyattidina Schuchert, 1913, in Zittel, 1913:415 [new name for Hyattella]
Hyborhynchella Cooper, 1955:59
Hybostenoscisma Liao and Meng, 1986:83
Hynniphoria Suess, 1859:44
Hyperobolus Havlicek, 1982:15
Hypoleiorhynchus Linnik, 1976:64 
Hypolinoproductus Liang, 1982, in Wang Guo(c)ping et al., 1982:212
Hyponeatrypa Struve, 1966:137 [subgenus of Atrypa]
Hypopsia Cooper and Grant, 1974:272
Hypothyridina buckman, 1906:324 [new name for Hypothyris King, 1846]
Hypothyris Phillips, 1841 [=Kallirhynchia]
Hypothyris King, 1846 [replaced by Hypothyridina]
Hypselonetes Racheboeuf, 1981:43 [subgenus of Strophochonetes] 
Hypseloterorhynchus Sartenaer, 1971:2
Hypsiptycha Wang, 1949:17
Hypsomyonia Cooper, 1955:53
Hysterohowellella Carls, 1985:310 [subgenus of Howellella]
Hysterolites Schlotheim, 1820:247
Hystricina Stainbrook, 1945 [replaced by Spinatrypa]
Hystriculina Muir(c)Wood and Cooper, 1960:211
Iberirhynchia Drot and Westbroek, 1966:165
Iberithyris Kvakhadze, 1971 [nomen nudum]; 1972:75
Iberohowellella Carls, Meyn and Vespermann, 1993:248 [subgenus of Howellella]
Iberomena Villas, 1984 [nomen nudum] 
Iberomena Villas 1985:97
Icodonta Bell, 1941:213 [=Micromitra]
Idioglyptus Northrop, 1939:173 [subgenus of Cymostrophia]
Idiorthis McLearn, 1924:56 [=Dalmanella]
Idiospira Cooper, 1956:691
Idiostrophia Ulrich and Cooper, 1936:631
Iheringithyris Levy, 1961:84
Ikella Tjazheva, 1972:205
Iliella Rukavischnikova, 1980, in Nikitin, Popov and Rukavischnikova, 1980:71 
Ilmarinia Opik, 1934:125
Ilmenia Nalivkin, 1941:186
Ilmeniopsis Xian, 1983:15 
Ilmenispina Havlicek, 1959:257
Ilmospirifer Ljaschenko, 1969:18
Iloerhynchus Balinski, 1995:47
Ilopsyrhynchus Sartenaer, 1988:59
Ilyinella Jassjukevitch, 1973:104
Imatrypa Havlicek, 1977:300
Imbrexia Nalivkin, 1937:105
Imbricatia Cooper, 1952:21
Imbricatospira Fu, 1980:5; 1982:149; 1985:96
Imperiospira Archbold and Thomas, 1993:314
Impiacus Lazarev and Suursuren, 1988:53
Implexina Poletaev, 1971, in Aisenverg, 1971:79
Inaequalis Sucic(c)Protic, 1971:12
Inceptospirifer Simakov, 1984 [nomen nudum]'(0*„(„(∞∞'åIncisius Grant, 1976:103
Incomptispirifer Simakov, 1984 [nomen nudum]
Incorthis Havlicek and Branisa, 1980:18
Indaclor Havlicek, 1990, in Havlicek and Storch, 1990:119
Independatrypa Copper, 1973:493 [subgenus of Desquamatia]
Indigia Barchatova, 1970 [nomen nudum]; 1973:100
Indorhynchia Ovtsharenko, 1975:124
Indospirifer Grabau, 1931:359
Inflatia Muir(c)Wood and Cooper, 1960:227
Infurca Percival, 1979:185
Ingelarella Campbell, 1959:341 [=Tomiopsis]
Ingria Opik, 1930:57
Iniathyris Besnossova, 1963, in Sarytcheva et al., 1963:312 [=Composita]
Iniproductus Lazarev, 1990:88
Innaechia Baranov, 1980:78 
Innuitella Crickmay, 1968:5
Inopinatarcula Elliott, 1952:2
Insignitisinurostrum Sartenaer, 1987:85
Institella Cooper, 1942:230
Institifera Muir(c)Wood and Cooper, 1960:203
Institina Muir(c)Wood and Cooper, 1960:165
Inversella Opik, 1933:21
Inversithyris Dagys, 1968:92
Invertina Copper and Chen, 1995:254
Invertrypa Struve, 1961:334
Iotina Cooper and Grant, 1976:1944
Iowarhynchus Carter, 1983:66
Iowatrypa Copper, 1973:495
Ipherron Havlicek, 1982:113
Iphidea Billings, 1872 [replaced by Iphidella Walcott, 1905]
Iphidella Walcott, 1912 [replaced by Dictyonina]
Iphidella Walcott, 1905:304 [new name for Iphidea; =Paterina]
Irboskites Bekker, 1924:48
Irenothyris Pojariskaja, 1966:27
Irgislella Tjazheva, 1972, in Tjazheva and Zhavoronkova, 1972:90
Irhirea Havlicek, 1971:44
Iridistrophia Havlicek, 1965:292
Iru Opik, 1934:89
Ishimia Nikitin, 1974:59
Isjuminelina Makridin, 1960, in Rzonsnitzkaja et al., 1960:254
Isjuminella Makridin, 1954; 1955 [nomina nuda; =Isjuminelina]
Ismenia King, 1850:245
Isochonetes Aisenverg, 1985:40
Isocrania Jaekel, 1902:1063
Isogramma Meek and Worthen, 1870:35
Isophragma Cooper, 1956:733
Isopoma Torley, 1934:81
Isorhynchus King, 1850 [replaced by Equirostra]
Isorthis Kozlowski, 1929:29
Isospinatrypa Struve, 1966:155 [subgenus of Spinatrypa]
Isovella Breivel and Breivel, 1970:52
Israelaria Cooper, 1976:281
Issedonia Popov, 1980, in Nazarov and Popov, 1980:103
Istokina Breivel and Breivel, 1988:81
Isumithyris Hatai, 1948:498
Ithyris Bigsby, 1878 [misspelling of Athyris]
Iubagraspirifer Gatinaud, 1949:487 [=Cyrtospirifer]
Iugrabaspirifer Gatinaud, 1949:487 [=Cyrtospirifer]
Ivanothyris Havlicek, 1957:440
Ivanovia Ivanova, 1949 [nomen nudum?]
Ivanoviella Makridin, 1954 [nomen nudum?]; 1955:83
Ivdelinella Brice, 1982:34 [sugenus of Ivdelinia]
Ivdelinia Andronov, 1961:45
Ivdeliniella Kim, 1981:36
Ivshinella Koneva, 1979:54
Iwaispirifer Tachibana, 1964:39
Jaanussonites Neuman, 1977:26
Jacetanella Racheboeuf, Batet and Magrans, 1993:9
Jacobella Patte, 1926 [invalid new name for Austriella, Jacobella preoccupied; replaced by Austriellula]
Jaffaia Thomson, 1927:254
Jaisalmeria Sahni, 1955:187
Jakutella Abramov, 1970:119 [subgenus of Krotovia]
Jakutochonetes Afanasjeva, 1977:31
Jakutoproductus Kaschirzev, 1959:28
Jakutostrophia Manankov, 1991:65
Jamesella Walcott, 1905:252
Janiceps Frech, 1901:551
Janiomya Havlicek, 1967:174'(0*„(„(∞∞'åJanius Havlicek, 1957:245
Japanithyris Thomson, 1927:251
Jarovathyris Havlicek, 1987:241 
Jatsengina Ivanova, 1960 [transliteration of Yatsengina]
Jevinellina Liu, 1983, in Liu, Xu, and Liang, 1983:262
Jezercia Havlicek and Mergl, 1982:40 
Jiangdaspirifer Chen, Rao, Zhou and Pan, 1986:74
Jielingia Zeng, 1987:235
Jiguliconcha Lazarev, 1990:81
Jilinia Liu, 1977, in Liu and Huang, 1977:61
Jilinmartinia Lee and Gu, 1980:488
Jilinospirifer Su, 1980:318
Jipuproductus Sun, 1983:123
Jisuina Grabau, 1931:105
Jivinella Havlicek, 1949:94
Johnsonathyris Savage, Eberlein, and Churkin, 1978:381
Johnsonetes Racheboeuf, 1987:7
Johnsoniatrypa Zhang, 1989:8
Jolkinia Breivel and Breivel, 1988:36
Jolonica Dall, 1920:366
Jolvia Sapelnikov, 1960:56
Jonesea Cocks and Rong, 1989:127 
Joviatrypa Copper, 1995:858
Junnanella Rzonsnitzkaja, 1958 [transliteration of Yunnanella]
Junnanellina Rzonsnitzkaja, 1958 [transliteration of Yunnanellina]
Juralina Kyansep, 1961:29
Juresania Fredericks, 1928:792
Juvavella Bittner, 1888:127
Juvavellina Bittner, 1896:132
Juxathyris Liang, 1990:271
Juxoldhamina Liang, 1990:235
Jvanoviella Makridin, 1955 [transliteration of Ivanoviella]
Kabanoviella Smirnova, 1973:43
Kachathyris Smirnova, 1975:120
Kadraliproductus Galitzkaja, 1977:36
Kafirnigania Katz, 1962:138
Kahlella Legrand(c)Blain, 1995:430
Kajnaria Nikitin and Popov, 1984, in Klenina, Nikitin, and Popov, 1984:144
Kalitvella Lazarev and Poletaev, 1982:92; Poletaev, 1986, in Murav'ev and Grigorjewa, 1986:122
Kallirhynchia Buckman, 1914 [nomen nudum]; 1918:31
Kamoica Hatai, 1936:313
Kampella Baarli, 1988:1116 
Kaninospirifer Kulikov and Stepanov, 1975, in Stepanov et al., 1975:63
Kansuella Chao, 1928:68
Kaplex Ficner and Havlicek, 1975:362
Kaplicona Havlicek, 1987:101
Karabachia Askerov, 1965; 1967 [nomina nuda]
Karabaghia Askerov, 1964 [nomen nudum]
Karadagella Babanova, 1965:95
Karadagithyris Tchorszhewsky, 1973 [nomen nudum]; 1974:55
Karakulina Andreeva, 1972:55
Karathele Koneva, 1986:206
Karavankina Ramovs, 1966 [nomen nudum]; 1969:253 [agreement by Sabrosky & Holthuis]
Karbous Havlicek, 1985:236
Kardonikithyris Tchorszhewsky, 1973 [nomen nudum]
Karlicium Havlicek, 1974:169
Karnotreta Williams and Curry, 1985:211
Karpathothyris Tchorszhewsky, 1973 [nomen nudum]
Karpatiella Sucic(c)Protic, 1985:27
Karpinskia Tschernyschew, 1885:49
Kasakhstania Besnossova, 1968, in Sarytcheva, 1968:179
Kasetia Waterhouse, 1981, in Waterhouse, 1981:89
Kassinella Borissiak, 1956, in Kiparisova et al., 1956:50
Katastrophomena Cocks, 1968:293
Katunia Kulkov, 1963:54
Kavesia Lazarev, 1987, in Lazarev and Simakov, 1987:122
Kawhiarhynchia MacFarlan, 1992:255
Kayserella Hall and Clarke, 1892:259
Kayseria Davidson, 1882:21
Kayserlingia Beecher, 1891 [misspelling of Keyserlingia]
Kedrovothyris Smirnova, 1984 [nomen nudum]; 1990:119
Keilamena Roomusoks, 1993:114
Kelamelia Zhang Zi(c)xin, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:306 
Kelsovia Clarke, 1990:70
Kelusia Mamedov, 1978 [=Diazoma]
Kendzhilgithyris Ovtsharenko, 1977 [nomen nudum]; 1983:82
Kendzhilgithyris Ovtsharenko, 1983:82
Kentronetes Racheboeuf and Herrera, 1994:552'(0*„(„(∞∞'åKeokukia Carter, 1990:229
Keratothyris Tuluweit, 1965:76
Kericserella Voros, 1983:9 
Kerpina Struve, 1961:333
Keskentassia Popov and Holmer, 1994:66
Kestonithyris Sahni, 1925:363 [=Gibbithyris]
Keyserlingia Pander, 1861:46
Keyserlingina Tschernyschew, 1902:475
Khangaestrophia Mendbayar, 1994:41
Khasagtina Ushatinskaia, 1987:66 
Khinganospirifer Su, 1976:221
Khodalevichia Boucot and Johnson, 1979:116 [subgenus of Kirkidium]
Khodalevitchia Boucot, 1975 [nomen nudum]
Kholbotchonia Baranov, 1988:40
Kiaeromena Spjeldnaes, 1957:183
Kiangsiella Grabau and Chao, 1927:103
Kijanina Aksarina, 1992:77
Kikaithyris Yabe and Hatai, 1941:495
Kilethyris Yasamanov, 1977 [nomen nudum]
Kindleina Savage, Eberlein, and Churkin, 1978:390
Kinelina Ljaschenko, 1969:35
Kingena Davidson, 1852:42
Kingenella Popiel(c)Barczyk, 1968:72
Kingenina Askerov, 1964; 1965; 1967 [nomina nuda]
Kinghiria Litvinovich, 1966:98; 1969, in Litvinovich et al., 1969:252
Kingia Schloenbach, 1866 [misspelling of Kingena]
Kinnella Bergstrom, 1968:11
Kintathyris Shi and Waterhouse, 1991:34
Kirkidium Amsden, Boucot, and Johnson, 1967:865
Kirkina Salmon, 1942:598
Kisilia Nalivkin, 1979:146
Kitakamithyris Minato, 1951:374
Kjaerina Bancroft, 1929:43
Kjerulfina Bancroft, 1929:59
Kleithriatreta Roberts, 1990, in Roberts and Jell, 1990:289
Klipsteinella Dagys, 1974:150
Klipsteinelleidea Sun, 1981 [misspelling of Klipsteinelloidea Sun, 1981] 
Klipsteinelloidea Sun, 1981:210
Klitambonites Pander, 1830 [=Clitambonites]
Klukatrypa Havlicek, 1987:95
Kochiproductus Dunbar, 1955:107 [new name for Tschernyschewiella]
Koeveskallina Dagys, 1965:172
Koigia Modzalevskaja 1985:37
Kokomerena Misius, 1986:182
Kolhidaella Moisseiev, 1939:189
Kolihium Havlicek, 1982:55
Kolymithyris Dagys, 1965:148
Komiella Barchatova, 1970 [nomen nudum]
Komiella Ljaschenko, 1985:14 [pre(c)occupied, not yet re(c)named]
Komispirifer Ljaschenko, 1973:105
Komukia Waterhouse, 1982:343
Koninckella Munier(c)Chalmas, 1880:280
Koninckia Suess, 1854 [misspelling of Koninckina]
Koninckina Suess, 1853, in Davidson, 1853:92
Koninckodonta Bittner, 1893:137
Konstantia Glazewski and Pajaud, 1970, in Pajaud, 1970:189
Korjakirhynchia Smirnova, 1984 [nomen nudum]; 1990:23
Kortugina Davidson, 1871 [misspelling of Kutorgina]
Kosirium Ficner and Havlicek, 1975:362
Kosoidea Havlicek and Mergl, 1988:171
Kosomena Havlicek, 1990, in Havlicek and Storch, 1990:71
Kotlaia Grant, 1993:4
Kotujella Andreeva, 1962:94
Kotujotreta Ushatinskaia, 1994:51
Kotylotreta Koneva, 1990:49
Kotysex Havlicek, 1990:218
Kozhuchinella Severgina, 1967:131
Kozlenia Havlicek, 1987:241
Kozlowskia Fredericks, 1933:29
Kozlowskiella Boucot, 1957 [replaced by Kozlowskiellina]
Kozlowskiellina Boucot, 1958:1031 [new name for Kozlowskiella]
Kozlowskites Havlicek, 1952:406 [subgenus of Eoplectodonta]
Kransia Westbroek, 1968:81
Krattorthis Jaanusson and Bassett, 1993:56
Kraussia Davidson, 1852 [replaced by Kraussina]
Kraussina Davidson, 1859, in Suess, 1859:210 [new name for Kraussia]
Kraussinina Paetel, 1875 [misspelling of Kraussina]
Krejcigrafella Struve, 1978:97 [subgenus of Schuchertellopsis]'(-0*„(„(∞∞'åKrimargyrotheca MacKinnon and Smirnova, 1995:676
Kritorhynchia Rong and Yang, 1980 [nomen nudum]; 1981:215
Krizistrophia Havlicek, 1992:176
Krotovia Fredericks, 1928:780
Kubanithyris Tchorszhewsky, 1989:29
Kueichowella Yang, 1978:267
Kullervo Opik, 1932:70
Kulumbella Nikiforova, 1960:61
Kumbella Khodalevich, 1975:137
Kundatella Aksarina, 1978, in Aksarina and Pelman, 1978:105
Kungaella Solomina, 1988:44
Kunlunia Wang, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:308
Kuntella Ovtsharenko, 1991:112
Kurakithyris Hatai, 1946:98; 1948:495
Kurnamena Roomusoks, 1989:114
Kurtomarginifera Xu, 1987:225
Kutchirhynchia Buckman, 1914 [nomen nudum]; 1918:54
Kutchithyris Buckman, 1915 [nomen nudum]; 1918:113
Kutorgina Billings, 1861:8
Kutorginella Ivanova, 1951:329
Kuvelousia Waterhouse, 1968:1175
Kuzgunia Klenina, 1984, in Klenina, Nikitin, and Popov, 1984:113 [subgenus of Zygospira]
Kuzgunia Misius, 1969 [nomen nudum]; 1986:186 [pre(c)occupied by Kuzgunia Klenina, 1984]
Kvania Havlicek, 1994:298
Kvesanirhynchia Kvakhadze, 1976:505
Kwangsia Grabau, 1931:205
Kwangsiella Grabau, 1932 [misspelling of Kwangsia]
Kwangsirhynchus Hou and Xian, 1975:38
Kymatothyris Struve, 1970:533
Kyrshabaktella Koneva, 1986:52
Kyrtatrypa Struve, 1966:135 [subgenus of Atrypa]
Labaia Licharew, 1956, in Kiparisova et al., 1956:66
Laballa Moisseiev, 1962, in Dagys, 1962:51
Labriproductus Cooper and Muir(c)Wood, 1951:195 [new name for Worthenella]
Lacazella Munier(c)Chalmas, 1880:279
Lachrymula Graham, 1970:158
Lacunaerhynchia Almeras, 1966:97
Lacunarites Opik, 1934:175
Lacunites Gorjansky, 1969:103
Lacunosella Wisniewska, 1932:30
Ladjia Veevers, 1959:125
Ladogia Nalivkin, 1941:165
Ladogiella Opik, 1934:93
Ladogifornix Schmidt, 1964:505
Ladogilina Ljaschenko, 1973:58
Ladogilinella Ljaschenko, 1973:61
Ladogioides McLaren, 1961:4
Laevicamera Grabau, 1936 [improper emendation of Levicamera]
Laevicyphomena Cocks, 1968:317 [subgenus of Cyphomena]
Laevigaterhynchia Wisniewska(c)Zelichowska, 1978:112
Laevirhynchia Dagys, 1974:91
Laevispirifer Ushatinskaia, 1977:137
Laevithyris Dagys, 1974:198
Laevorhynchia Shen and He, 1994:449
Laima Gravitis, 1981:448
Laioporella Ivanova, 1975:83
Lakhmina Oehlert, 1887, in Fischer, 1887:1265 [new name for Davidsonella Waagen, 1885; =Neobolus]
Lamanskya Moberg and Segerberg, 1906:71
Lamarckispirifer Gatinaud, 1949:489 [=Cyrtospirifer]
Lambdarina Brunton and Champion, 1974:819
Lamellaerhynchia Burri, 1953:274
Lamelliconchidium Kulkov, 1968:38
Lamellispirifer Nalivkin, 1937 [=Mucrospirifer]
Lamellokoninckina Jin and Fang, 1977:57
Lamellosathyris Jin and Fang, 1983:147
Lamellosia Cooper and Grant, 1975:1270
Laminatia Muir(c)Wood and Cooper, 1960:190
Lamiproductus Liang, 1990:205
Lammellosathyris Ching and Fang, 1983, in Fang, 1983:101 
Lamnaespina Waterhouse, 1976:244
Lamnimargus Waterhouse, 1975:10
Lamniplica Waterhouse and Rao, 1989:32
Lampangella Waterhouse, 1983:121
Lancangjiangia Jin and Fang, 1977:50
Lanceomyonia Havlicek, 1960:243
Landonella MacKinnon, 1993:337
Langella Mendes, 1961:3
Langkawia Hamada, 1969:261'(0*„(„(∞∞'åLangshanthyris Sun, 1987:89
Lanipustula Klets, 1983:75 
Laosia Mansuy, 1913:83
Lapradella Baranov, 1989:49
Laqueus Dall, 1870:123
Larispirifer Enokjan and Poletaev, 1986, in Poletaev, 1986:68
Larium Gregorio, 1930:25
Lateralatirostrum Sartenaer, 1979:539
Lathamella Liu, 1979:509
Laticrura Cooper, 1956:980
Latiflexa Koczyrkevicz, 1984:14
Latiplecus Lee and Gu, 1976:299
Latiproductus Sarytcheva and Legrand(c)Blain, 1977:75
Latirhynchia Fu, 1980:3; 1982:137
Latispina Wang and Jin, 1991:496
Latispirifer Archbold and Thomas, 1985:270 
Latonotoechia Havlicek, 1960:244
Lazella Radulovic, 1991:29
Lazithyris Radulovic, 1986:45
Lazutkinia Rzonsnitzkaja, 1952:152
Leangella Opik, 1933:42
Lebediorthis Severgina, 1984:46 
Leiochonetes Roberts, 1976:26
Leiolepismatina Yang and Xu, 1966:39
Leioproductus Stainbrook, 1947:308
Leiorhynchoidea Cloud, 1944, in King et al., 1944:57
Leiorhynchoides Dovgal, 1953:140
Leiorhynchus Hall, 1860:75
Leioria Cooper, 1976:284
Leioseptathyris Wu, 1974, in Wang et al., 1974:42
Leiothycridina Grunt, 1980:64
Lenatoechia Nikiforova, 1970:106
Lengwuella Liang, 1990:420
Lenorthis Andreeva, 1955:69 [invalid(c) replaced by Paralenorthis]
Lenothyris Dagys, 1968:100
Lenzia Perry, Boucot, and Gabrielse, 1981:35
Leontiella Yadrenkina, 1982:73
Lepidocrania Cooper and Grant, 1974:246
Lepidocycloides Nikiforova, 1961, in Nikiforova and Andreeva, 1961:212
Lepidocyclus Wang, 1949:12
Lepidoleptaena Havlicek, 1963:224
Lepidomena Laurie, 1991:55
Lepidorhynchia Burri, 1956:689
Lepidorthis Wang, 1955:331
Lepidospirifer Cooper and Grant, 1969:15
Lepismatina Wang, 1955:353 [=Psioidea]
Leptaena Dalman, 1828:94
Leptaenalosia King, 1845 [nomen nudum; =Strophalosia]
Leptaenella Sokolskaja, 1952 [=Leptagonia; junior homonym of Leptaenella Fredericks]
Leptaenella Fredericks, 1918:89 [=Leptaena]
Leptaenisca Beecher, 1890:239
Leptaenoidea Hedstrom, 1917:5
Leptaenomendax Garcia(c)Alcalde, in Garcia(c)Alcalde and Martinez Chacon, 1978:255
Leptaenopoma Marek and Havlicek, 1967:282
Leptaenopyxis Havlicek, 1963:224
Leptaenulopsis Haupt, 1878 [nomen nudum?; =Leptaena]
Leptagonia McCoy, 1844:117
Leptalosia Dunbar and Condra, 1932:260
Leptathyris Siehl, 1962:212
Leptella Hall and Clarke, 1892:293
Leptellina Ulrich and Cooper, 1936:626
Leptelloidea Jones, 1928:385
Leptembolon Mickwitz, 1896:130 [=Lingulella]
Leptestia Bekker, 1922:363
Leptestiina Havlicek, 1952:412
Leptobolus Hall, 1871:3
Leptobulus Hall, 1871 [misspelling of Leptobulus]
Leptocaryorhynchus Sartenaer, 1970:14
Leptochonetes Havlicek and Racheboeuf, 1979:89
Leptocoelia Hall, 1857:108
Leptocoelina Johnson, 1970:170
Leptodonta Khalfin, 1955:237 [new name for Oehlertia]
Leptodontella Khalfin, 1948:254
Leptodus Kayser, 1883:161
Leptogonia Agassiz, 1846 [misspelling of Leptagonia]
Leptolepyron Jin, 1989:113 
Leptoptilum Opik, 1930:130 [=Leptestia]
Leptoskelidion Amsden, 1974:47'( 0*„(„(∞∞'åLeptospira Boucot, Johnson, and Staton, 1964:814
Leptostrophia Hall and Clarke, 1892:288
Leptostrophiella Harper and Boucot, 1978:74 [subgenus of Leptostrophia]
Leptothyrella Muir(c)Wood, 1965:H855 [new name for Leptothyris]
Leptothyrellopsis Bitner and Pisera, 1979:82
Leptothyris Muir(c)Wood, 1959 [replaced by Leptothyrella]
Lercarella Mascle and Termier, 1970:188
Lespius Gregorio, 1930:24 [=Streptorhynchus]
Lessiniella Voros, 1993:52
Lethamia Waterhouse, 1973:38
Leurosina Cooper and Grant, 1975:1260
Levenea Schuchert and Cooper, 1931:246
Levibiseptum Xian, 1975, in Hou and Xian, 1975:31
Levicamera Grabau, 1934 [nomen nudum; =Psilocamara]
Leviconchidiella Rzonsnitzkaja, 1960, in Markowskii, 1960:301
Levigatella Andronov, 1961:38
Levigypa Sapelnikov and Mizens, 1985, in Sapelnikov, 1985:9 [subgenus of Multicosta]
Levipugnax Pushkin, 1986:78
Levipustula Maxwell, 1951:10
Levisapicus Tong, 1990, in Tong et al., 1990:66
Levispira Mizens, 1975:47
Levitusia Muir(c)Wood and Cooper, 1960:295
Leymerithyris Calzada, 1988, in Calzada, Seguier and Tambareau, 1988:40
Lezhoeviella Baranov, 1978:48
Lialosia Muir(c)Wood and Cooper, 1960:87
Liberella Liang, 1990:105
Libyaeglossa Havlicek, 1973, in Havlicek and Massa, 1973:275
Libyaerhynchus Mergl and Massa, 1992:65
Libys Massa, Termier, and Termier, 1974:175
Lichareviella Ustritsky, 1959 [invalid, not published]
Licharewia Einor, 1939:69
Licharewiella Sokolskaja, 1960 [replaced by Magniderbyia]
Licharewiella Ustritsky, 1960, in Ustritsky et al., 1960:47
Lichnatrypa Wang and Rong, 1986:144
Lievinella Boucot, 1975:372
Ligatella Martinez, 1978:29 [subgenus of Notothyris]
Ligatella Martinez, 1978:29 [subgenus of Notothyris] 
Ligula Cuvier, 1798 [misspelling of Lingula]
Ligularius Dumeril, 1806 [misspelling of Lingula]
Ligulops Hall, 1871 [misspelling of Lingulops]
Liljevallia Hedstrom, 1917:12
Limbatrypa Copper, 1982:700
Limbella Stehli, 1954:329
Limbifera Brunton and Mundy, 1988:69 
Limbimurina Cooper, 1956:851
Limstrophia Fu, 1980:2
Limstrophina Fu, 1982:132 [=Limstrophia]
Lindinella Mergl and Slehoferova, 1990:74
Lindstroemelia Dunbar and Condra, 1932 [misspelling of Lindstroemella]
Lindstroemella Hall and Clarke, 1890:134
Lindstromella Hall and Clarke, 1889 [nomen nudum; =Lindstroemella]
Lineirhynchia Buckman, 1914 [nomen nudum]; 1918:59 [=Furcirhynchia]
Lingatrypa Mizens, 1985:10 [subgenus of Atrypoidea]
Lingshanella Yao, 1980 [nomen nudum]; Xu and Yao, 1986:174
Linguithyris Buckman, 1914 [nomen nudum]; 1918:99
Lingula Bruguiere, 1797, pl.250 [type designated by Lamarck, 1799:89
Lingulapholis Schuchert, 1913:295
Lingularia Biernat and Emig, 1993:10
Lingularius Schuchert and LeVene, 1929 [misspelling of Ligularius]
Lingulasma Ulrich, 1889:384
Lingulelasma Miller, 1889 [improper emendation of Lingulasma]
Lingulella Salter, 1866:333
Lingulellotreta Koneva, 1983, in Gorjansky and Koneva, 1983:132
Lingulepis Hall, 1863:129
Lingulichnites Szmuc, Osgood, and Meinke, 1976 [ichnogenus; =Lingulichnus]
Lingulichnus Hakes, 1976 [ichnogenus]
Lingulidiscina Girty, 1909 [misspelling of Lingulodiscina]
Lingulipora Girty, 1898:387
Lingulobolus Matthew, 1895:261
Lingulodiscina Whitfield, 1890:122
Lingulops Hall, 1871:2 [nomen nudum]; 1872, plate 13
Linguopugnoides Havlicek, 1960:242
Linnarssonella Walcott, 1902:601
Linnarssonia Walcott, 1885:115
Linoporella Schuchert and Cooper, 1931:247
Linoproductus Chao, 1927:128
Linoprotonia Ferguson, 1971:551
Linostrophomena Rong, Xu, and Yang, 1974:203'(!0*„(„(∞∞'åLinterella Amsden, 1988, in Amsden and Barrick, 1988:20
Linxiangxiella Yang, 1984:230
Liocoelia Schuchert and Cooper, 1931:248
Lioleptaena Xian, 1978:265
Liolimbella Li, 1991, in Ding et al., 1991:155
Liorhynchus Oehlert, 1887 [improper emendation of Leiorhynchus]
Liosomena Liang, 1990:110
Liosotella Cooper, 1953:36
Liospiriferina Rousselle, 1977:164
Liostrophia Cooper and Kindle, 1936:355
Liothyrella Thomson, 1916:44
Liothyrina Oehlert, 1887 [new name for Liothyris; =Gryphus]
Liothyris Douville, 1879 [replaced by Liothyrina]
Lipanteris Briggs, 1986, in Waterhouse, 1986:36
Liralingua Graham, 1970:153
Liramia Cooper, 1983:199
Liraplecta Ching and Sun, 1979 [nomen nudum]
Liraplecta Jing and Sun, 1981:138
Liraria Cooper and Grant, 1975:1156
Liraspirifer Stainbrook, 1950:381 [=Cyrtospirifer]
Lirellaria Cooper and Grant, 1976:2031
Lirellarina Cooper, 1989:49
Liricamera Cooper, 1956:592
Liriplica Campbell, 1961:440
Lissajousithyris Almeras, 1971:164
Lissatrypa Twenhofel, 1914:33
Lissatrypella Sapelnikov and Mizens, 1982:30
Lissatrypoidea Boucot and Amsden, 1958:159
Lissella Campbell, 1961:452
Lissidium Lenz, 1989:1223
Lissochonetes Dunbar and Condra, 1932:170
Lissocoelina Schuchert and Cooper, 1931:248
Lissocrania Williams, 1943:71 [=Crania]
Lissoleptaena Havlicek, 1992:171
Lissomarginifera Lane, 1962:902 [=Eomarginifera]
Lissopleura Whitfield, 1896:232
Lissorhynchia Yang and Xu, 1966:14
Lissosia Cooper and Grant, 1975:1241 [subgenus of Dyoros]
Lissostrophia Amsden, 1949:202
Lissothyris Smirnova, 1987:35
Lissotreta Amsden, 1968:37 [subgenus of Onychotreta]
Litocothia Grant, 1976:166
Litothyris Roberts, 1971:237
Litothyris Chang, 1987:761 [pre(c)occupied by Litothyris Roberts, 1971]
Liveringia Archbold, 1987:30
Lixatrypa Havlicek, 1987:78
Ljaschenkovia Batrukova, 1969:71
Ljudmilispirifer Tcherkesova, 1976:90
Llanoella Boucot, 1975:351
Loboidothyris Buckman, 1914 [nomen nudum]; 1918:112
Loboidothyropsis Sucic(c)Protic, 1971:17
Loborina Balinski, 1982:130
Lobothyrella Tchorszhewsky, 1971 [nomen nudum]
Lobothyris Buckman, 1914 [nomen nudum]; 1918:107
Lobothyroides Xu, 1978:307
Lobothyropsis Tchorszhewsky, 1974 [nomen nudum]
Lobvia Breivel and Breivel, 1977:97 [subgenus of Theodossia]
Lochengia Grabau, 1929, in Yoh, 1929:78
Lochkothele Havlicek and Mergl, 1988:169
Loczyella Frech, 1901:503
Loganella Boucot and Amsden, 1958:164 [=Rhipidomella]
Loilemia Reed, 1936:116
Lokutella Voros, 1983:6
Lomatiphora Roberts, 1971:84
Lomatorthis Williams and Curry, 1985:230
Longdongshuia Hou and Xian, 1975:39
Longipegma Popov and Holmer, 1994:110
Longispina Cooper, 1942:230
Longithyris Katz and Popov, 1974:30
Longvillia Bancroft, 1933:3 [=Strophomena]
Longxianirhynchia Fu, 1982:144
Longyania Zhu, 1990:71
Lopasnia Ilkhovsky, 1990, in Lazarev, 1990:103
Loperia Walcott, 1905:287
Lophrothyris Buckman, 1914 [nomen nudum]; 1918:114
Lopingia Chan, 1979, in Hou et al., 1979:64
Lorangerella Crickmay, 1963:11
Lordorthis Ross, 1959:447'("0*„(„(∞∞'åLoreleiella Racheboeuf, 1986:643 
Loriolithyris Middlemiss, 1968:176
Losvia Breivel and Breivel, 1976, in Tjazheva et al., 1976:116; 1977:83
Lotharingella Laurin, 1984:368
Lowenstamia Stehli, 1961:460
Loxophragmus Cooper and Grant, 1974:432
Luanquella Garcia(c)Alcalde and Racheboeuf, 1978:847
Ludfordina Kelly, 1967:599
Luhaia Roomusoks, 1956:1091
Luhotreta Mergl and Slehoferova, 1990:95
Lunaria Ching, Sun, and Ye, 1979:155
Lunoglossa Xu and Xie, 1985:469
Lunpolaia Ching and Ye, 1979, in Ye and Yang, 1979:67
Luofuia Xu, 1977:66
Luppovithyris Lobatscheva, 1990 [nomen nudum]; 1990:100
Lurgiticoma Popov, 1980, in Nazarov and Popov, 1980:99
Luterella Amsden, 1988, in Amsden and Barrick, 1988:20
Lutetiarcula Elliott, 1954:727
Luwurhynchus Yao, 1980 [nomen nudum] 
Lychnothyris Voros, 1983:11
Lycophoria Lahusen, 1886:221
Lyonia Archbold, 1983:244 
Lyra Cumberland, 1818, in Sowerby, 1818:84 [=Terebrirostra]
Lysidium Havlicek, 1985:299
Lysigypa Havlicek, 1990, in Havlicek and Kukal, 1990:139
Lysingothyris Hall, 1867 [misspelling of Syringothyris]
Lytha Fredericks, 1924:298 [=Spirifer]
Lyttonia Waagen, 1883:398 [=Leptodus]
Maakina Andreeva, 1961, in Nikiforova and Andreeva, 1961:170
Mabella Klenina, 1984, in Klenina, Nikitin, and Popov, 1984:69 [subgenus of Leptellina] 
Macandrevia King, 1859:261
Macandrewia Bronn, 1862 [improper emendation of Macandrevia]
Machaeraria Cooper, 1955:55
Machaeratoechia Havlicek, 1992:63
Machaerocolella Li, 1980 [nomen nudum]; Li and Han, 1980:15
Mackerrovia Cocks, 1968:319
Maclarenella Stehli, 1955:868
Macrocoelia Cooper, 1956:891
Macroplectane Cossmann, 1909:215 [new name for Denckmannia; =Rensselandia]
Macropleura Boucot, 1963:690
Macropotamorhynchus Sartenaer, 1970:24
Madarosia Cooper and Grant, 1976:2002
Madoia Sun and Ye, 1982:162
Magadania Ganelin, 1977:153
Magadina Thomson, 1915:400
Magas Sowerby, 1818:40
Magasella Dall, 1870:134
Magella Thomson, 1915:396
Magellania Bayle, 1880:240 [new name for Waldheimia]
Magharithyris Farag and Gatinaud, 1962:77
Magicostrophia Zhu, 1985:43
Magnicanalis Rowell, 1962:140
Magniderbyia Ting, 1965:265 [new name for Licharewiella Sokolskaja, 1960]
Magniplicatina Waterhouse, 1983:130 
Magnithyris Sahni, 1925:367 [=Carneithyris]
Magniventra Harper and Boucot, 1978:77
Magnumbonella Carter, 1968:1145
Maia Fredericks, 1924 [replacement by Mansuyella invalid, Mansuyella preoccupied; replaced by Callispirina]
Majkopella Moisseiev, 1962, in Dagys, 1962:61
Makridinirhynchia Sucic(c)Protic, 1969:81
Makridinithyris Tchorszhewsky, 1989:82
Malayanoplia Hamada, 1969:255
Malinella Andreeva, 1982:55
Malleia Thomson, 1927:283
Malloproductus Tachibana, 1981:63 [new name for Nodella Tachibana, 1964, pre(c)occupied] 
Maltaia Cooper, 1983:231
Malurostrophia Campbell and Talent, 1967:309
Malwirhynchia Chiplonker, 1938:306
Mamatia Popov and Holmer, 1994:128
Mametothyris Smirnova, 1969, in Smirnova and Pergament, 1969:34
Mammosum Gregorio, 1930:25 [=Streptorhynchus]
Mamutinetes Havlicek, 1990, in Havlicek and Kukal, 1990:132
Manespira Copper, 1986:839 
Mangkeluia Xu, 1991:318
Manithyris Foster, 1974:55
Mannia Dewalque, 1868 [nomen nudum]
Mannia Davidson, 1874:156 [=Cryptopora]
Manoproductus Boucot, 1975 [nomen nudum]'(#0*„(„(∞∞'åManosia Zeng, 1983, in Wang Xaofeng et al., 1983:123 
Mansina Andreeva, 1977:116
Mansuyella Reed, 1944 [invalid new name for Maia, Mansuyella preoccupied; replaced by Callispirina]
Maorielasma Waterhouse, 1964:175
Maorirhynchia MacFarlan, 1992:71
Maoristrophia Allan, 1947:440
Mapingtichia Lee, 1986, in Lee, Yang, and Feng, 1986:217 
Marcharella Andreeva, 1968, in Markowskii, 1968:75
Margaritiproductus Lazarev, 1986:67
Marginalosia Waterhouse, 1978:64
Marginatia Muir(c)Wood and Cooper, 1960:263
Marginella Gemmellaro, 1897 [nomen nudum]
Marginicinctus Sutton, 1938:561
Marginifera Waagen, 1884:717
Marginirugus Sutton, 1938:561
Marginoproductus Tan, 1986:435
Marginorthis Liu, Zhu and Xue, 1985:16
Marginovatia Gordon and Henry, 1990:533
Mariannaella Sapelnikov and Rukavischnikova, 1975:7
Mariaspirifer Tcherkesova, 1991:97
Marinurnula Waterhouse, 1964:177
Mariona Nalivkin, 1975 [=Parallelora]
Marionella Bancroft, 1928 [replaced by Marionites; subgenus of Multicostella]
Marionites Cooper and Muir(c)Wood, 1951:195 [new name for Marionella; subgenus of Multicostella]
Maritimithyris Smirnova, 1986, in Smirnova and Konovalov, 1986:76
Markamia Jin and Shi, 1985, in Jin, Wang, Sun, and Shi, 1985:192
Markitoechia Havlicek, 1959:81
Marklandella Harper, Boucot, and Walmsley, 1969:82
Martellia Wirth, 1936:300 [=Polytoechia]
Martellispirifer Gatinaud, 1949:487 [=Cyrtospirifer]
Martinella Lee, 1939 [misspelling of Martiniella]
Martinia McCoy, 1844:139
Martiniella Grabau and Tien, 1931, in Grabau, 1931:420
Martinigisis Lebedev, 1926 [incertae sedis]
Martiniopsis Waagen, 1883:525
Martinothyris Minato, 1953:70
Matanoleptodus Liao, 1983:639
Matutella Cooper, 1951:5
Mauispirifer Allan, 1947:445
Maxillirhynchia Buckman, 1914 [nomen nudum]; 1918:55
Maya Rakusz, 1932 [misspelling of Maia]
Mayaothyris Sun, 1987:72
Maydenella Laurie, 1991:85
Mcewanella Foerste, 1920:197
Mclearnia Caster, 1939 [replaced by Mclearnites]
Mclearnites Caster, 1945:319 [new name for Mclearnia; =Shaleria]
Mclearnitesella Harper and Boucot, 1978:131 [subgenus of Mclearnites]
Medessia Andreeva, 1960, in Markowskii, 1960:295
Mediospirifer Bublichenko, 1956:102
Mediterranirhynchia Sucic(c)Protic, 1969:53
Meekella White and St. John, 1867:120
Meekina Walcott, 1905 [nomen nudum]
Megachonetes Sokolskaja, 1950:42
Megaderbyia Jing, Ye, Xu, and Sun, 1979 [improper emendation of Magniderbyia]
Megakozlowskiella Boucot, 1957:322 [subgenus of Kozlowskiella; =Kozlowskiellina]
Megakozlowskiellina Amsden and Ventress, 1963 [name apparently used subgenerically rather than specifically as was intended; =Kozlowskiellina]
Megalanteris Oehlert, 1887 [misspelling of Meganteris]
Megalopterorhynchus Sartenaer, 1965:5
Megalorhynchus Gregorio, 1930 [misspelling of Megarhynchus]
Megalosia Waterhouse, 1988:41
Megamyonia Wang, 1949:32
Meganterella Boucot, 1959:767
Meganteris Suess, 1855:51
Megaplectatrypa Zhang, 1981:386
Megapleuronia Cooper, 1952:117
Megarhynchus Gemmellaro, 1894 [replaced by Gemmellaroia]
Megarites Rafinesque, 1831 [nomen nudum]
Megasalopina Boucot, Gauri, and Johnson, 1966:166
Megasella Paetel, 1875 [misspelling of Magasella]
Megaspinochonetes Yang and Rong, 1980 [nomen nudum]; 1982:427
Megasteges Waterhouse, 1975:6
Megastrophia Caster, 1939:37
Megastrophiella Harper and Boucot, 1978:19 [subgenus of Megastrophia]
Megathiris Orbigny, 1847:269 [new name for Argiope]
Megathyris Bronn, 1848 [misspelling of Megathiris]
Megatschernyschewia Sremac, 1986:19
Megerlea Davidson, 1856 [misspelling of Megerlia]
Megerleia Bronn, 1862 [misspelling of Megerlia]'($0*„(„(∞∞'åMegerlia King, 1850:145 [replacement by Muehfeldtia invalid, Megerlia not preoccupied]
Megerlina Deslongchamps, 1884:243
Megorima Rafinesque, 1819 [nomen nudum]
Megorisma Paetel, 1875 [misspelling of Megorima]
Megousia Muir(c)Wood and Cooper, 1960:309
Megumatrypa Harper, 1973:72
Meifodia Williams, 1951:106
Mendacella Cooper, 1930:381
Mendathyris Cloud, 1942:125
Mennespirifer Ljaschenko, 1973:101
Mentzelia Quenstedt, 1871:522
Mentzelioides Dagys, 1974:130
Mentzeliopsis Trechmann, 1918:229
Meonia Steinich, 1963:732
Merciella Lamont and Gilbert, 1945:655
Merista Suess, 1851:150
Meristella Hall, 1860:75
Meristelloides Isaacson, 1977:176
Meristelloides Branisa, 1965 [nomen nudum]; =Meristelloides Isaacson]
Meristelloides Isaacson, 1977:176
Meristelloides Branisa, 1965 [nomen nudum;= Meristelloides Isaacson]
Meristina Hall, 1867:299
Meristorygma Carter, 1974:689
Meristospira Grabau, 1910, in Grabau and Sherzer, 1910:159
Merophricus Cooper, 1983:113
Merospirifer Reed, 1949:467
Mesochorispira Carter, 1992:335 [new subgenus of Spirifer]
Mesocoelia Su, 1980 [nomen nudum]
Mesodalmanella Havlicek, 1950:26 [=Howellites]
Mesodouviella Harper and Boucot, 1978:124 [subgenus of Mesodouvillina]
Mesodouvillina Williams, 1950:281 [subgenus of Douvillina]
Mesoleptostrophia Harper and Boucot, 1978:68
Mesolissostrophia Williams, 1950:280 [subgenus of Lissostrophia]
Mesolobus Dunbar and Condra, 1932:160
Mesonomia Ulrich and Cooper, 1936:627
Mesopholidostrophia Williams, 1950:280 [subgenus of Pholidostrophia]
Mesoplica Reed, 1943:97
Mesoseptina Munoz, 1994:167
Mesospirifer Wedekind, 1935 [nomen nudum]
Mesotreta Kutorga, 1848:270
Metabolipa Godefroid, 1974:5
Metacamarella Reed, 1917:934
Metaplasia Hall and Clarke, 1893:56
Metathyrisina Rong and Yang, 1979 [nomen nudum]; 1981:246
Metorthis Wang, 1955:333
Metriolepis Cooper and Grant, 1976:2717
Mexicaria Cooper, 1983:114 
Mezounia Havlicek, 1967:31
Miaohuangrhynchus Yang, 1977:374
Micella Ovtsharenko, 1976:24
Micidus Chatterton, 1973:134
Mickwitzella Walcott, 1908 [=Thysanotos]
Mickwitzia Schmidt, 1888:5
Micraphelia Cooper and Grant, 1969:4
Microcardinalia Boucot and Ehlers, 1963:51
Micromitra Meek, 1873:479
Microrhynchia Muir(c)Wood, 1952:124
Microsphaeridiorhynchus Sartenaer, 1970:27
Microthyridina Schuchert and LeVene, 1929:120 [new name for Microthyris; =Ornithella]
Microthyris Deslongchamps, 1884 [replaced by Microthyridina]
Microtrypa Wilson, 1945:144
Mictospirifer Johnson, 1995:607
Mikrothyris Quenstedt, 1868 [nomen nudum?; =Atrypa]
Millythyris Almeras, 1971:245
Mimaria Cooper and Grant, 1976:2907
Mimatrypa Struve, 1964:436
Mimella Cooper, 1930:376
Mimikonstantia Baker and Elston, 1984:778
Mimorina Cooper, 1983:232
Mimulus Barrande, 1879 [replaced by Brachymimulus]
Minatothyris Vandercammen, 1957:178 [=Warrenella]
Mingenewia Archbold, 1980:255
Miniplanus Waterhouse and Piyasin, 1970:101 [subgenus of Diplanus]
Miniprokopia Havlicek, 1971:229
Minirostrella Balinski, 1995:50
Minispina Waterhouse, 1982:45
Minithyris Radulovic, 1991:26
Minororthis Ivanov, 1950, in Ivanov and Miagkova, 1950:23'(%0*„(„(∞∞'åMinutilla Crickmay, 1967:10 [subgenus of Acutatheca]
Minutostropheodonta Harper and Boucot, 1978:30
Minutulirhynchia Smirnova, 1992:27
Minysphenia Grant, 1988:126
Minythyra Brunton, 1984:102
Miogryphus Hertlein and Grant, 1944:95
Miopentamerus Woods, 1937 [nomen nudum?; invalid name; =Pentamerus]
Mirantesia Mohanti, 1972:176
Mirifusella Carter, 1971:250
Mirilingula Popov, 1983, in Koneva and Popov, 1983:116
Mirisquamea Sucic(c)Protic, 1971:38
Mirorthis Zeng, 1983, in Wang Xaofeng et al., 1983:116
Mirtellaspirifer Gatinaud, 1949:488 [=Cyrtospirifer]
Misolia Seidlitz, 1913:179
Mistproductus Yang, 1991:87
Mitchellella Strusz, 1984:126 [subgenus of Leptostrophia]
Miyakothyris Hatai, 1938:100
Mjoesina Spjeldnaes, 1957:137
Mobergia Redlich, 1899:5 [=Botsfordia]
Moderatoproductus Litvinovich and Vorontsova, 1983:86
Modestella Owen, 1961, in Casey, 1961:573
Moeschia Boullier, 1976:333
Mogoktella Andreeva, 1968, in Markowskii, 1968:82
Mogoliella Ischnazarov, 1972:69
Moisseevia Makridin, 1964:243
Moisseievia Dagys, 1963:46
Molandispirifer Simakov, 1984 [nomen nudum]
Molongcola Percival, 1991:153
Molongella Savage, 1974:13
Molongia Mitchell, 1921:547
Monadotoechia Havlicek, 1960:243
Monelasmina Cooper, 1955:54
Mongolella Alekseeva, 1976:347
Mongolina Grabau, 1931:102 [=Rostranteris]
Mongoliopsis Grunt, 1977:79
Mongolirhynchia Hou and Zhao, 1976:191
Mongolochonetes Afanasjeva, 1991, in Pavlova et al., 1991:98
Mongolorhynx Erlanger, 1992:54
Mongolosia Manankov and Pavlova, 1976:354
Mongolospira Alekseeva, 1977:63
Mongolostrophia Rozman and Rong, 1993:39
Monobolina Salter, 1866:334
Monoconvexa Pelman, 1977:49
Monomerella Billings, 1871:221
Monorthis Bates, 1968:144
Monsardithyris Almeras, 1971:198
Montanella Ovtsharenko, 1976:21
Monticlarella Wisniewska, 1932:55
Monticola Nalivkin, 1930 [replaced by Plectorhynchella]
Monticulifera Muir(c)Wood and Cooper, 1960:327
Montsenetes Racheboeuf, 1992:37
Moorefieldella Girty, 1911:63
Moorellina Elliott, 1953:694
Moquellina Ching, Sun, and Ye, 1979:141
Moraviaturia Sahni, 1960:19
Moravilla Havlicek, 1953:4
Moravostrophia Havlicek, 1962:471
Morganella McKellar, 1970:17
Morinatrypa Havlicek, 1990, in Havlicek and Storch, 1990:165
Morinorhynchus Havlicek, 1965:291
Morphorhynchus Cooper and Dutro, 1982:72
Morrisia Davidson, 1852:371 [=Platidia]
Morrisina Grabau, 1931:98 [=Hemiptychina]
Morrisithyris Almeras, 1971:131
Moscvella Makridin, 1954 [nomen nudum; =Mosquella]
Mosquella Makridin, 1955:86
Moumina Fredericks, 1924:323
Moutonithyris Middlemiss, 1976:63
Mucroclipeus Goldman and Mitchell, 1990:85 
Mucrospirifer Grabau, 1931:408
Mucrospiriferinella Waterhouse, 1982:48
Muehlfeldtia Bayle, 1880 [invalid new name for Megerlia, Megerlia not preoccupied]
Muirwoodella Tchorszhewsky, 1973 [nomen nudum]; 1974:52
Muirwoodellopsis Tchorszhewsky, 1973; 1974 [nomina nuda]
Muirwoodia Licharew, 1947:187
Multicorhynchia Chen, 1983:152
Multicosta Khodalevich and Breivel, 1977, in Breivel and Breivel, 1977:71 [subgenus of Leviconchidiella]
Multicostella Schuchert and Cooper, 1931:244'(&0*„(„(∞∞'åMultiridgia Zeng, 1987:234 
Multispinula Waterhouse, 1966 [replaced by Echinalosia]
Multispinula Rowell, 1962:147
Multispirifer Kaplun, 1961:88 [subgenus of Eospirifer]
Munella Fredericks, 1924 [replaced by Purdonella]
Munhella Neuman, 1971:117
Munia Fredericks, 1918 [replaced by Fredericksia]
Munieratrypa Mizens and Rzonsnitzkaja, 1979:60
Muriferella Johnson and Talent, 1967:44
Murihikurhynchia MacFarlan, 1992:131
Murinella Cooper, 1956:844
Murjukiana Severgina, 1967:134
Murravia Thomson, 1916:45
Murrinyinella Kruse, 1990:39
Musculina Schuchert and LeVene, 1929:120 [new name for Musculus]
Musculus Quenstedt, 1869 [replaced by Musculina]
Mutationella Kozlowski, 1929:31
Mycerosia Cooper, 1989:117 
Mylloconotreta Williams and Curry, 1985:203
Myodelthyrium Thomas, 1985:164
Myopugnax Glushenko, 1975:96
Myotreta Gorjansky, 1969:67
Myriospirifer Havlicek, 1978:105
Myrmirhynx Havlicek, 1982:366
Mystrophora Kayser, 1871:612
Nabarredia Havlicek and Racheboeuf, 1979:96
Nabiaoia Xu, 1979:370
Nadiastrophia Talent, 1963:62
Najadospirifer Havlicek, 1957:246
Najdinothyris Makridin and Katz, 1964, in Makridin, 1964:35
Nakazatothyris Minato and Kato, 1977:623 [subgenus of Undispirifer]
Nalivkinaria Rzonsnitzkaja, 1968, in Markowskii, 1968:117
Nalivkinella Popov, 1974, in Katz and Popov, 1974:23 [preocuppied by Nalivkinella Soshkina, 1939]
Nalivkinia Bublichenko, 1928:982
Nanacalathis Zezina, 1981:162
Nanambonites Liu, 1976:145
Nanatrypa Sapelnikov and Mizens, 1982:12 [subgenus of Lissatrypa]
Nannirhynchia Buckman, 1914 [nomen nudum]; 1918:67
Nanorthis Ulrich and Cooper, 1936:621
Nanospira Amsden, 1949:203
Nanothyris Cloud, 1942:45
Nantanella Grabau, 1936:72
Nanukidium Jones, 1979:1261 [new name for Rossella]
Naradanithyris Tokuyama, 1958:2
Narynella Andreeva, 1987:34
Nasonirhynchia Havlicek, 1992:83
Nastosia Cooper, 1989:50
Naukat Popov and Tikhonov, 1990:41
Navalicria Sartenaer 1989:66
Navispira Amsden, 1983:1253
Nayunnella Sartenaer, 1961:2 [new name for Yunnanella Grabau, 1931]
Neaguithyris Georgescu, 1991:242
Neatretia Fischer and Oehlert, 1891 [=Cryptopora]
NeatrypaStruve, 1964:526 [subgenus of Desquamatia]
Nebenothyris Minato, 1953:72
Negramithyris Prosorovskaja, 1985:114
Neimongolella Zhang, 1981:385
Nekhoroshevia Bublichenko, 1956:101
Nekvasilovela Calzada, 1987:321
Nematocrania Grant, 1976:31
Nemesa Schmidt, 1941:41
Neoancistrocrania Laurin, 1992:345
Neoathyrisina Chen, 1990:250 [new name for Athyrisinoides Chen and Wan, 1978, pre(c)occupied]
Neobolus Waagen, 1885:758
Neobouchardia Thomson, 1927:270
Neochonetes Muir(c)Wood, 1962:87
Neocirpa Prosorovskaja, 1985 [nomen nudum]; 1985:110 
Neocoelia McKellar, 1966:2
Neocramatia Harper, 1989:102
Neocrania Lee and Brunton 1986:150
Neocyrtina Yang and Xu, 1966:62
Neodelthyris Hou, 1963:413
Neoedriosteges Liang, 1990:150
Neofascicosta Xu, 1978:278
Neoglobithyris Havlicek, 1984:59
Neogypidula Licharew, 1934 [nomen nudum]; 1961:204
Neohemithyris Yabe and Hatai, 1934:587 [=Basiliola]
Neokarpinskia Mizens, 1977:95 [subgenus of Karpinskia]'('0*„(„(∞∞'åNeokjaerina Levy and Nullo, 1974:191 [subgenus of Kjaerina]
Neoliothyrina Sahni, 1925:375
Neometabolipa Godefroid, 1974:23
Neomunella Ozaki, 1931:25 [=Choristites]
Neophricadothyris Licharew, 1934:175
Neophricodothyris Ivanova, 1960 [misspelling of Neophricadothyris]
Neoplicatifera Jin, Liao, and Fang, 1974:309
Neoproboscidella Ivanova, 1949 [nomen nudum]
Neoproductella Lee, 1939 [nomen nudum]
Neopugilis Li, 1991, in Ding et al., 1991:159
Neoretzia Dagys, 1963:130
Neorhynchia Thomson, 1915:388
Neorhynchula Liang, 1983, in Liu, Xu, and Liang, 1983:285
Neorichthofenia Shen, He and Zhu, 1992:180
Neoschizophoria Yanagida, 1983:103
Neospirifer Nikitin, 1900 [nomen nudum; =Neospirifer Fredericks, 1924]
Neospirifer Fredericks, 1924:311
Neospirigerina Rzonsnitzkaja, 1975:72 [subgenus of Spirigerina]
Neostrophia Ulrich and Cooper, 1936:631
Neothecidella Pajaud, 1970:108
Neothyris Douville, 1879:274
Neotreta Sobolev, 1976:132
Neotrigonella Cossmann, 1910 [new name for Trigonella; objective synonym of Tetractinella; subjective synonym of Cheirothyris]
Neouncinulus Ma, 1980 [nomen nudum]
Neowellerella Dagys, 1974:116
Neoyanguania Shi, 1988:348 
Nepasitoechia Havlicek, 1979:91
Nereidella Wang, 1955:339 [=Paurorthis]
Nerthebrochus Cooper, 1983:206
Nervostrophia Caster, 1939:79
Neumanella Harper and Boucot, 1978:29
Neumania Harper, 1981, in Bruton and Harper, 1981:162
Neumayrithyris Tokuyama, 1958:120
Newberria Hall, 1891 [=Rensselandia]
Newberrya Schuchert, 1897 [improper emendation of Newberria]
Nicolella Reed, 1917:860
Nicoloidea Zeng, 1987:215
Nicolorthis Havlicek, 1981:7
Nigerinoplica Lazarev, 1986:66
Nigeroplica Nalivkin, 1975, in Stepanov, 1975:160
Nikiforovaena Boucot, 1963:67
Nikolaevirhynchus Baranov, 1988:38
Ningbingella Roberts, 1971:152
Ninglangothyris Jin and Fang, 1977:60
Niorhynx Havlicek, 1982:368
Nipponirhynchia Yanagida and Nishikawa, 1984:163
Nipponithyris Yabe and Hatai, 1934:588
Niquivilia Benedetto and Herrera, 1993:48
Nisusia Walcott, 1905:248
Niutoushania Liao, 1984:281
Niviconia Cooper and Grant, 1974:374
Nix Easton, 1962:45
Nochoroiella Pelman, 1983, in Grigorjewa, Melnikova, and Pelman, 1983:54 
Nocturnellia Havlicek, 1950:53 [=Dalmanella]
Nodaea Tachibana, 1981:67 
Nodella Tachibana, 1964:38 [replaced by Malloproductus]
Noetlingia Hall and Clarke, 1893:229 [subgenus of Porambonites]
Nondia Boucot and Chiang, 1974:66
Nordathyris Grunt, 1977:73
Nordella Ljaschenko, 1973:135
Nordispirifer Ljaschenko, 1973:104
Nordotoechia Tcherkesova, 1965:80
Norella Bittner, 1890:315
Norgium Breivel and Breivel, 1970 [=Proconchidium]
Notanoplia Gill, 1950:249
Nothokuvelousia Waterhouse, 1986:62 
Nothopindax Cooper and Grant, 1974:318
Nothorthis Ulrich and Cooper, 1938:106
Notiobolus Popov, 1981, in Popov and Solovjev, 1981:67
Notiochonetes Muir(c)Wood, 1962:48
Notoconchidium Gill, 1950:243; 1951:187 [=Karpinskia]
Notoleptaena Gill, 1950 [nomen nudum]; 1951:192
Notolosia Archbold, 1986:114 [subgenus of Echinalosia]
Notoparmella Johnson, 1973:1026
Notorthisina Havlicek and Branisa, 1980:28 
Notorygmia Cooper, 1972:13
Notosaria Cooper, 1959:48
Notoscaphidia Williams and Curry, 1985:233 '((0*„(„(∞∞'åNotosia Cooper, 1983:122
Notospirifer Harrington, 1955:115
Notostrophia Waterhouse, 1973:35
Notothyrina Licharew, 1936:271 [subgenus of Rostranteris]
Notothyris Waagen, 1882:378
Notozyga Cooper, 1977:105
Novellinetes Havlicek and Racheboeuf, 1979:87
Novozemelia Tcherkesova, 1973:28
Nowakia Fang and Jiang, 1980 [nomen nudum] 
Nubialba Neuman, 1994:1231
Nucleata Quenstedt, 1868:25
Nucleatina Katz, 1962:135
Nucleorhynchia Liang, 1983, in Liu, Xu, and Liang, 1983:272
Nucleospira Hall, 1859:23
Nucleusorhynchia Sun and Ye, 1982:159
Nudauris Stehli, 1954:317
Nudirostra Cooper and Muir(c)Wood, 1951 [invalid new name for Leiorhynchus, Leiorhynchus not preoccupied]
Nudirostralina Yang and Xu, 1966:21
Nudispiriferina Yang and Xu, 1966:47
Nudymia Lazarev, 1990:93
Nugnecella Levy and Nullo, 1974:28
Nuguschella Tjazheva, 1960, in Markowskii, 1960:408
Numericoma Popov, 1980, in Nazarov and Popov, 1980:100
Nurataella Larin, 1973:135
Nuratamella Kalashnikov, 1992, in Kalashnikov and Askarov, 1992:64
Nuria Misius, 1986:199
Nurochonetes Ushatinskaia, 1977:42
Nushbiella Popov, 1986, in Kolobova and Popov, 1986:251
Nyalamurhynchia Ching, Rong, and Sun, 1976, in Ching et al., 1976:300
Nyege Veevers, 1959:113
Nymphorhynchia Rzonsnitzkaja, 1956, in Kiparisova et al., 1956:53
Oanduporella Hints, 1975:19
Obesaria Havlicek, 1957:438
Obliqunsteges Liang, 1990:373
Oblongarcula Elliott, 1959:147
Obnixia Hoover, 1979:11
Obolella Billings, 1861:7
Obolellina Billings, 1871:222 [=Rhynobolus]
Obolopsis Saito, 1936:350
Obolorugia Zhang, 1983, in Zhang, Fu and Ding, 1983:425
Obolus Eichwald, 1829:274
Obovites Rafinesque, 1831 [nomen nudum]
Obovothyris Buckman, 1927:32
Obscurella Baranov, 1991:36
Obsoletirhynchia Shi, 1992:143
Obturamentella Amsden, 1958:99
Obulus Quenstedt, 1868 [misspelling of Obolus]
Ochotathyris Dagys, 1974:159
Ochotorhynchia Dagys, 1968:47
Ocnerorthis Bell, 1941:251
Ocorthis Melou, 1982:25
Ocruranus Liu, 1979:506
Odarovithyris Tchorszhewsky, 1971:63
Odontospirifer Dunbar, 1955:155
Odoratus Zhu, 1985:39 
Oehlertella Hall and Clarke, 1890:132
Oehlertia Khalfin, 1948 [replaced by Leptodonta]
Oepikina Salmon, 1942:589
Oepikinella Wilson, 1944:199 [=Strophomena]
Oepikites Khazanovitch and Popov, 1984, in Khazanovitch, Popov, and Mel'nikova, 1984:40 
Ogbinia Sarytcheva, 1965, in Ruzhentsev and Sarytcheva, 1965:229
Ogilviella Lenz, 1968:180
Oglu Havlicek, 1987:81
Oglupes Havlicek, 1987:239
Ogmoplecia Wright and Jaanusson, 1993:94
Ogmusia Cooper, 1983:207
Oina Popov and Tikhonov, 1990:42
Oiosia Cooper and Dutro, 1982:117
Okathyris Smironova, 1975:71
Oldhamella Noetling, 1905 [invalid new name for Oldhamina]
Oldhamia Zittel, 1910 [misspelling of Oldhamina]
Oldhamina Waagen, 1883:406 [replacement by Oldhamella and Waagenopora invalid]
Oldhaminella Wanner and Sieverts, 1935:232
Oleneothyris Cooper, 1942:233
Olentotreta Koneva, Popov, and Ushatinskaia, 1990, in Koneva, Popov, Ushatinskaia, and Esakova, 1990:161
Oleorthis Havlicek, 1968:124 [=Saukrodictya per written comm. of Havlicek]
Olgerdia Grigorjewa, 1977:50
Oligomys Schuchert and Cooper, 1931:243'()0*„(„(∞∞'åOligoptycherhynchus Sartenaer, 1970:20
Oligorhachis Imbrie, 1959:403
Oligorhynchia Cooper, 1935:49
Oligorhytisia Cooper, 1983:125
Oligorthis Ulrich and Cooper, 1936:624
Oligothyrina Cooper, 1956:526
Oliveirella Oliveira, 1934:167 [new name for Brasilia; =Paranaia]
Ombonia Caneva, 1906:54
Omnutakhella Lopushinskaja, 1976:66
Omolonella Moisseiev, 1936:39
Omolonia Alekseeva, 1967, in Alekseeva and Nuzhdina, 1967:138
Omolonospirifer Simakov, 1970 [=Tenisia]
Omolonothyris Dagys, 1968:132
Oncosarina Cooper and Grant, 1969:9
Onegia Andreev, 1993:51
Onniella Bancroft, 1928:55
Onnizetina Havlicek, 1974:168
Onopordumaria Waterhouse, 1971, in Bamber and Waterhouse, 1971:205
Onugorhynchia Havlicek, 1992:87
Onychoplecia Cooper, 1956:529
Onychotreta Ulrich and Cooper, 1936:339
Opikella Amsden, 1968:48 [subgenus of Leangella]
Opisthotreta Palmer, 1954:771
Oppeliella Tchorszhewsky, 1989:81
Opsiconidion Ludvigsen, 1974:143
Orbicella Orbigny, 1847 [replaced by Clistotrema]
Orbicoelia Waterhouse and Piyasin, 1970:144
Orbicula Cuvier, 1798:435 [=Crania]
Orbicularius Dumerial, 1806 [=Crania]
Orbiculatisinurostrum Sartenaer, 1984:2
Orbiculoidea Orbigny, 1847:269
Orbiculopora Batrukova, 1969:75
Orbiculothyris Wolfart, 1968, in Wolfart et al., 1968:528
Orbinaria Muir(c)Wood and Cooper, 1960:150
Orbirhynchia Pettitt, 1954:29
Orbithele Sdzuy, 1955:9
Orenburgella Pavlova, 1969:76
Orhoria Havlicek, 1990, in Havlicek and Storch, 1990:73
Oriensellina Smirnova, 1986, in Smirnova and Konovalov, 1986:75
Oriensirhynchia Smirnova, 1984 [nomen nudum]
Orientospira Dagys, 1965:101
Orientospirifer Hou and Xian, 1975:49
Orientothyris Katz and Popov, 1974:28
Origostrophia Mitchell, 1977:115
Oriskania Hall and Clarke, 1893:270
Orlovirhynchia Dagys, 1968:75
Ornatothyrella Dagys, 1974:210
Ornatothyris Sahni, 1929:45
Ornithella Deslongchamps, 1884:273
Ornithothyris Sahni, 1925:374 [=Carneithyris]
Ornothyrella Havlicek, 1971:80
Orthambonites Pander, 1830:81
Orthidiella Ulrich and Cooper, 1936:621
Orthidium Hall and Clarke, 1892:244
Orthiella Ljaschenko, 1985:11
Orthis Dalman, 1828:112
Orthisina Orbigny, 1847 [=Clitambonites]
Orthisocrania Rowell, 1963:39
Orthocarina Fu, 1980:3(c)4; 1982:158 [subgenus of Ovalospira]
Orthoidea Friren, 1876:1
Orthokopis Baarli, 1995:9
Ortholina Calzada, 1984:5
Orthonomaea Hall, 1859 [nomen nudum]; 1893, in Hall and Clarke, 1893:159 [=Catazyga]
Orthopleura Imbrie, 1959:391
Orthorhynchula Hall and Clarke, 1893:181
Orthorhynchuloides Williams, 1962:241
Orthorhynchyllion Jin, 1989:72
Orthospirifer Pitrat, 1975:387
Orthostrophella Amsden, 1968:23
Orthostrophia Hall, 1883, pl.36
Orthotetella King, 1931:51
Orthotetes Fischer de Wladheim, 1829:375
Orthotetoides Lazarev, 1984:69
Orthothetina Schellwien, 1900:10
Orthothrix Geinitz, 1847:86
Orthothyris Cooper, 1955:64
Orthotichia Hall and Clarke, 1892:213
Orthotichina Tschernyschew, 1914 [misspelling of Orthotichia]'(*0*„(„(∞∞'åOrthotoma Quenstedt, 1869:315
Orthotomoides Tchorszhewsky, 1971 [nomen nudum]
Orthotropia Hall and Clarke, 1893, pl.84
Ortotichia Tschernyschew, 1914 [misspelling of Orthotichia]
Orulgania Solomina and Tschernjak, 1961:61
Orusia Walcott, 1905:273
Oslogonites Opik, 1939:133
Oslomena Spjeldnaes, 1957:161 [=Glyptomena]
Osmarella Pearson, 1977:58
Otarella Rukavischnikova, 1982 [nomen nudum]
Otariella Waterhouse, 1978:30 [subgenus of Marginifera]
Otariella Popov and Holmer, 1994:141 [pre(c)occupied by Otariella Waterhouse, 1978]
Otarorhyncha Nikiforova and Popov, 1981:62 
Otospirifer Hou and Xian, 1975:65
Ottadalenites Harper, 1981, in Bruton and Harper, 1981:165
Ottenbyella Popov and Holmer, 1994:114
Otusia Walcott, 1905:246
Ovalella Walmsley and Boucot, 1975:75 [subgenus of Isorthis]
Ovalia Nalivkin, 1937 [=Brachythyris]
Ovalospira Fu, 1980:3; 1982:157 
Ovatathyris Owen, 1988:106 
Ovatia Muir(c)Wood and Cooper, 1960:312
Overtonia Thomas, 1914:260
Overtoniina Grunt, 1973, in Grunt and Dmitriev, 1973:94
Ovidiella Nikitin and Popov, 1984, in Klenina, Nikitin, and Popov, 1984:130
Ovlatchania Abramov and Grigorjewa, 1986:113
Owenirhynchia Calzada, 1980, in Calzada and Pocovi, 1980:14
Oxlosia Ulrich and Cooper, 1936:619 [new name for Eunoa]
Oxoplecia Wilson, 1913:81
Oxycolpella Dagys, 1962:68
Oxypleurorhynchia Plodowski, 1973:85
Oxyrhynchus Quenstedt, 1868 [nomen nudum]
Ozora Carter, 1990:226
Pachancorhynchia Brice, 1986, in Brice et al., 1986:121 
Pachiloma Rafinesque, 1831 [nomen nudum]
Pachyglossa Cooper, 1956 [replaced by Pachyglossella]
Pachyglossella Cooper, 1960:601 [new name for Pachyglossa]
Pachymagas Ihering, 1903:332
Pachymoorellina Baker, 1989:56
Pachyplax Alvarez and Brunton, 1990:31
Pachyrhynchus King, 1850 [=Bouchardia]
Pachythyris Boullier, 1976:154
Pacificocoelia Boucot, 1975:361
Pacifithyris Hatai, 1938:216
Paeckelmanella Licharew, 1934:212
Paeckelmannia Licharew, 1934 [invalid new name for Tornquistia, Tornquistia not preoccupied]
Pahlenella Schuchert and Cooper, 1931:245
Pajaudina Logan, 1988:546
Pakistania Stehli, 1961 [replaced by Whitspakia]
Palaebolus Matthew, 1899:202
Palaeochoristites Sokolskaja, 1941:26
Palaeocrania Eichwald, 1854 [=Pseudocrania]
Palaeoglossa Cockerell, 1911:96 [new name for Glossina]
Palaeoglossina Dunbar and Condra, 1932 [misspelling of Palaeoglossa]
Palaeoldhamina Liang, 1982, in Wang Guo(c)ping et al., 1982:230
Palaeoleptostrophia Rong and Cocks, 1994:683
Palaeoschizophoria Fu, 1982:107
Palaeoschmidtites Koneva, 1979:35
Palaeospirifer Martynova and Sverbilova, 1968:26
Palaeostrophia Ulrich and Cooper, 1936:627
Palaeostrophomena Holtedahl, 1916:43
Palaeotrimerella Li and Han, 1980:10 
Palaferella Spriestersbach, 1942:187 [=Gruenewaldtia]
Paldiskia Gorjansky, 1969:28
Paldiskites Havlicek, 1982:34
Palinorthis Ulrich and Cooper, 1936:625 [=Ingria]
Pallasiella Renz, 1932 [replaced by Phymatothyris]
Palmerhytis Brunton and Mundy, 1986:6
Pamirorhynchia Ovtsharenko, 1977 [nomen nudum]; 1983:51
Pamirorhynchia Ovtsharenko, 1983:51 
Pamirotheca Dagys, 1974:79
Pamirothyris Ovtsharenko, 1975 [replaced by Pamirothyropsis]
Pamirothyris Dagys, 1974:195
Pamirothyropsis Ovtsharenko, 1979:126 [new name for Pamirothyris Ovtsharenko, 1975]
Pammegetherhynchus Sartenaer, 1977:68
Pampoecilorhynchus Sartenaer, 1968:4
Panderina Schuchert and Cooper, 1931:243
Panderites Roomusoks, 1993:49'(+0*„(„(∞∞'åPantellaria Dall, 1919:251
Papiliolinus Waterhouse and Gupta, 1977:160
Papillostrophia Havlicek, 1967:132
Papodina Voros, 1983:15
Paraacanthothyris Kamyschan, 1973, in Kamyschan and Babanova, 1973:67
Parabifolium Pajaud, 1966:70
Parabornhardtina Sun and Hou, 1964, in Hou and Xian, 1964:416 [subgenus of Bornhardtina]
Paraboubeithyris Middlemiss, 1980:533
Parabuxtonia Yang and Zhang, 1982:304
Paracapillithyris Katz and Popov, 1974:26
Parachonetella Liao, 1980:260
Parachonetes Johnson, 1966:365
Parachoristites Barchatova, 1968, in Markowskii, 1968:164; 1970:145
Paracomposita Ding and Yao, 1985:70
Paraconchidium Rong and Yang, 1974:198
Paracostanoplia Xu, 1977:65
Paracraniops Williams, 1963:347
Paracrothyris Wu, 1974, in Wang et al., 1974:42
Paracrurithyris Liao, 1979 [nomen nudum]; 1981:54
Paracrurithyris Liao, 1981, in Zhao, Sheng et al., 1981:54
Paracyrtiopsis Gatinaud, 1949:490 [=Cyrtiopsis]
Parademonedys Yang, 1984:208
Paraderbyia Sun, 1983:120
Paradicoelosia Zhang, 1985 [nomen nudum]
Paradinobolus Li and Han, 1980:19
Paradolerorthis Zeng, 1987:218 [subgenus of Dolerorthis] 
Paradoxothyris Xu, 1978:302
Paradygella Liao and Sun, 1974:352
Paraemanuella Yang, 1977:415
Parageyerella He & Zhu, 1985:201 
Paraglossinulus Martynova, 1988:41
Paragusarella Shi, 1990:315
Parahemiptychina Chen, Rao, Zhao and Pan, 1986:77
Paraiantiquatonia Ding and Yao, 1980 [nomen nudum]
Parajuresania Lazarev, 1982:69
Parakansuella Tan, 1987:123
Parakarpinskia Zhang, 1983, in Zhang, Fu and Ding, 1983:347; 1983:589
Parakeyserlingina Fredericks, 1916:64 [=Keyserlingina]
Parakinetica Richardson, 1987:39 
Parakingena Sun, 1981:250
Paralaballa Sun, 1981:204
Paralazutkinia Jiang, 1978:314
Paraldingia Richardson, 1973:122
Paralenorthis Havlicek and Branisa, 1980:15 [new name for Lenorthis Andreeva, 1955]
Paralepismatina Yang and Xu, 1966:38
Paraleptodus Lee and Gu, 1980, in Lee, Gu, and Su, 1980:390
Paraleptostrophia Harper and Boucot, 1978:70 [subgenus of Mesoleptostrophia]
Parallelelasma Cooper, 1956:612
Parallelora Carter, 1974:680
Paralyttonia Wanner and Sieverts, 1935:207
Paramarginatia Yang, 1978:111
Paramarginifera Fredericks, 1916:64
Paramartinia Reed, 1949:471 [=Martinia]
Parameekella He & Zhu, 1985:199
Paramentzelia Xu, 1978:293
Paramerista Su, 1976:207
Paramesolobus Afanasjeva, 1975:101
Paramonticulifera Tong, 1978:234
Paramuirwoodia Zhang Zi(c)xin, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:298
Paranaia Clarke, 1913, pl.21 [new name for Brasilia]
Paranorella Cloud, 1944, in King et al., 1944:59
Paranorellina Dagys, 1974:100
Parantiptychia Xu and Liu, 1980 [nomen nudum}; 1983:99
Paranudirostralina Sun and Ye, 1982:156
Paraoligorhyncha Popov, 1981, in Nikiforova and Popov, 1981:65 
Paraonychoplecia Percival, 1991:133
Paraorthotetina He & Zhu, 1985:198
Paraparostictia Ma, 1980 [nomen nudum]
Parapholidostrophia Johnson, 1971:309
Paraphorhynchus Weller, 1905:261
Paraplatythyris Sun, 1987:77
Paraplectatrypa Zeng et al., 1993:375 [nomen nudum]
Paraplicanoplia Xu, 1977:67
Paraplicatifera Zhao and Tan, 1984:26
Parapugnax Schmidt, 1964:505
Parapulchratia Chan, 1979, in Hou et al., 1979:87
Paraquadrithyris Yang, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:367
Parareticularia Lee and Gu, 1976:298'(,0*„(„(∞∞'åPararhactorhynchia Shi, 1990:311
Pararhipidium Boucot and Johnson, 1979:101 [subgenus of Rhipidium]
Pararhipidium Boucot, 1975 [nomen nudum; =Pararhipidium Boucot and Johnson, 1979]
Pararhynchospirina Zhang, 1981:387
Paraschizophoria Lazarev, 1976:110 [subgenus of Schizophoria]
Paraspirifer Wedekind, 1926:198
Paraspiriferina Reed, 1944:252
Parastringocephalus Struve, 1965:467 [subgenus of Stringocephalus]
Parastrophia Hall and Clarke, 1894 [replaced by Parastrophina]
Parastrophina Schuchert and LeVene, 1929:121 [new name for Parastrophia]
Parastrophinella Schuchert and Cooper, 1931:248
Parastrophonella Bublichenko, 1956:93
Parasulcatinella Xu and Liu, 1980 [nomen nudum]; 1983:96 
Paratetratomia Yang, 1977:394
Parathecidea Backhaus, 1959:55
Parathyridina Schuchert and LeVene, 1929:121 [new name for Parathyris]
Parathyris Douville, 1916 [replaced by Parathyridina]
Parathyrisina Wang, 1974, in Wang et al., 1974:41
Paratreta Biernat, 1973:68
Paratribonium Sapelnikov and Mizens, 1991:107
Parazyga Hall and Clarke, 1893:127
Pareatonia McLearn, 1918 [=Eatonia]
Parenteletes King, 1931:48
Paritisteges Liang, 1990:376
Parmephrix Brunton, Racheboeuf and Mundy, 1994:58
Parmorthina Havlicek, 1975:232
Parmorthis Schuchert and Cooper, 1931:246 [Resserella]
Parmula Menakova and Breivel, 1987:110
Paromalomena Rong, 1979 [nomen nudum]; 1982, in Fu, 1982:123; 1984:150
Paromalomena Rong, 1982, in Fu, 1982:123 [nomen nudum]; 1984:150 [correspondence with Rong]
Paromoeopygma Sartenaer, 1968:3
Parostictia Ma, 1980 [nomen nudum]
Parthirhynchia Titova, 1980:77
Paruncinella Waterhouse and Gupta, 1979:132
Parvaltissimarostrum Sartenaer and Xu, 1991:127
Parvirhynchia Buckman, 1914 [nomen nudum]; 1918:56
Parvulaltarostrum Sartenaer, 1979:2
Paryphella Liao, 1979 [nomen nudum]; 1981:53
Paryphella Liao, 1981, in Zhao, Sheng et al., 1981:53
Paryphorhynchopora Simorin, 1956:245
Paryphorhynchus Weller, 1914 [misspelling of Paraphorhynchus]
Patagorhynchia Allan, 1938:199
Paterina Beecher, 1891:345
Paterorthis Havlicek, 1971:45
Paterula Barrande, 1879:110
Patriaspirifer Johnson, 1995:198
Paucicostella Cooper, 1956:711
Paucicrura Cooper, 1956:956 [new name for Resserella Schuchert and Cooper, 1932, not Bancroft, 1928]
Paucispinauria Waterhouse, 1983:130 
Paucispinifera Muir(c)Wood and Cooper, 1960:319
Paucistrophia Wang and Zhu, 1979:23
Paulinella Boucot and Racheboeuf, 1987:99
Paulonia Nalivkin, 1925:282
Paurogastroderhynchus Sartenaer, 1970:25
Paurorhyncha Cooper, 1942:231
Paurorthina Rubel, 1961:187 [=Paurorthis]
Paurorthis Schuchert and Cooper, 1931:243
Pavdenia Breivel and Breivel, 1988:114
Payuella Grabau, 1934:150
Pectorhyncha McLearn, 1918:137
Peculneithyris Smirnova, 1972, in Smirnova and Terekhova, 1972:76
Peetzatrypa Rzonsnitzkaja, 1975:95
Pegmarhynchia Cooper, 1955:58
Pegmathyris Hatai, 1938:99
Pegmatreta Bell, 1941:231 [=Linnarssonia]
Pelagodiscus Dall, 1908:440
Pelaiella Martinez, 1991:84
Peleicostella Havlicek, 1971:230
Pelmania Konvea, 1992:89
Pelonomia Cooper, 1956:699
Peltichia Ching and Sun, 1979 [nomen nudum]
Peltichia Jing and Liao, 1981, in Jing and Sun, 1981:129 
Pembrostrophia Bassett, 1971:325 [subgenus of Amphistrophia]
Pemphixina Cooper, 1981:13 
Peniculauris Muir(c)Wood and Cooper, 1960:279
Pennospiriferina Dagys, 1965:112
Pentactinella Bittner, 1890:301
Pentagonia Cozzens, 1846:158'(-0*„(„(∞∞'åPentamerella Hall, 1867:163
Pentamerifera Khodalevich, 1939:22
Pentameroides Schuchert and Cooper, 1931:248
Pentamerus Sowerby, 1812:73
Pentithyris Cooper, 1983:127
Pentlandella Boucot, 1964:104
Pentlandina Bancroft, 1949:13
Penzhinella Solomina, 1985:119
Penzhinothyris Smirnova, 1969, in Smirnova and Pergament, 1969:36
Perakia Hamada, 1969:7
Peratos Copper, 1986:856
Perditocardinia Schuchert and Cooper, 1931:246
Peregrinella Oehlert, 1887, in Fischer, 1887:1305
Peregrinellina Hou and Wang, 1984:211 [subgenus of Peregrinella]
Peregrinelloidea Dagys, 1968:43
Perennithyris Tchorszhewsky, 1973; 1974 [nomina nuda]
Pereudesia Dall, 1920 [=Coptothyris]
Periallus Hoover, 1979:17
Perichonetes Xu, 1979:372
Peridalejina Havlicek, 1973:337
Peridiolithus Huepsch, 1768 [nonbinomial]
Perigeyerella Wang, 1955:346
Perihustedia Xu, 1991:321
Perimecocoelia Cooper, 1956:593
Perissothyris Carter, 1967:588
Peristerothyris Mancenido, 1983:349
Peritrimerella Liang, 1983, in Liu, Xu, and Liang, 1983:257
Peritritoechia Xu, Rong, and Liu, 1974:151
Permasyrinx Waterhouse, 1983:155
Permianella He and Zhu, 1979:132
Permicola Koczyrkevicz, 1976:75
Permochonetes Afanasjeva, 1977:148
Permophricodothyris Pavlova, 1965:134
Permorthotetes Thomas, 1958:82 [=Orthotetes]
Permospirifer Kulikov, 1950:5 [=Licharewia]
Permundaria Nakamura, Kato, and Choi, 1970:295
Perrarisinurostrum Sartenaer, 1984:4
Perrierithyris Almeras, 1971:423
Perryspirifer Jones and Boucot, 1983:339
Peshiatrypa Xian, 1978:298 [subgenus of Desquamatia]
Pesterevatrypa Rzonsnitzkaja, 1975:93
Petalochonetes Afanasjeva, 1988:52
Petalothyris Cooper, 1983:128
Petasmaia Cooper and Grant, 1969:12
Petasmaria Cooper and Dutro, 1982:83 
Petria Mendes, 1961:22
Petrocrania Raymond, 1911:229 [new name for Craniella]
Petroria Wilson, 1926:28
Petshorospirifer Fotieva, 1985:56
Pexidella Bittner, 1890:300
Phaceloorthis Percival, 1991:129
Phaneropora Zezina, 1981:18
Phapsirhynchia Pajaud, 1976:102
Pharcidodiscus Roberts, 1976:46
Pharetra Bolten, 1798:159 [=Lingula]
Phaseolina Gaspard, 1988:163
Phenacozugmayerella Hoover, 1991:89
Philedra Bekker, 1921 [misspelling of Philhedra]
Philhedra Koken, 1889:467
Philhedrella Kozlowski, 1929:28
Philippotia Racheboeuf, 1982:1024 [new name for Hemichonetes Racheboeuf, 1981]
Phithyopora Simakov, 1984 [nomen nudum]
Phlogoiderhynchus Sartenaer, 1970:18
Phoenicitoechia Havlicek, 1960:242
Pholidops Hall, 1859 [=Craniops]
Pholidostrophia Hall and Clarke, 1892:287
Phragmophora Cooper, 1955:51
Phragmorthis Cooper, 1956:509
Phragmostrophia Harper et al., 1967:428
Phragmothyris Cooper, 1955:66
Phrenophoria Cooper and Grant, 1969:12
Phricodothyris George, 1932:525
Phyllolasma Liang, 1990:426
Phyllonia Su, 1980:327
Phymatothyris Cooper and Muir(c)Wood, 1951:195 [new name for Palasiella]
Physemella Godefroid, 1974:50
Physetorhyncha Sartenaer and Rozman, 1968:137
Physotreta Rowell, 1966:19'(.0*„(„(∞∞'åPiarorhynchella Dagys, 1974:110
Piarorhynchia Buckman, 1914 [nomen nudum]; 1918:34
Piarothyris Sahni, 1925:370 [=Carneithyris]
Piatnitzkya Taboada, 1993:591
Picnotreta Henderson and MacKinnon, 1981:301
Pictothyris Thomson, 1927:260
Pidiobolus Mergl, 1995:103
Pilkena Richardson, 1991:42
Piloricilla Carter, 1987:33
Pinaxiothyris Dagys, 1968:86
Pinegathyris Grunt, 1980:88
Pinghuangella Jiang, 1978:315
Pinguaella Boucot and Johnson, 1979:114 [subgenus of Kirkidium]
Pinguaella Boucot, 1975 [nomen nudum]; =Pinguaella Boucot and Johnson, 1979]
Pinguispirifer Havlicek, 1957:246
Pioglyptus St. Joseph, 1941 [misspelling of Idioglyptus]
Pionodema Foerste, 1912:139 [new name for Bathycoelia]
Pionomena Cooper, 1956:901
Pionopleurum Cooper, 1989:83
Pionorthis Schuchert and Cooper, 1931:244 [subgenus of Plaesiomys]
Pionothyris Cooper, 1983:130
Piramidatospirifer Simakov, 1984 [nomen nudum] 
Pirgula Gregorio, 1930 [replaced by Pirgulia]
Pirgulia Cooper and Muir(c)Wood, 1951:195 [new name for Pirgula]
Pirgumena Roomusoks, 1993:163
Pirithyris Sun and Ye, 1982:167
Pirotella Sucic(c)Protic, 1985:22
Pirothyris Thomson, 1927:280
Pirotothyris Sucic(c)Protic, 1971:31
Pisirhynchia Buckman, 1914 [nomen nudum]; 1918:28
Pizarroa Hoek, 1912, in Steinmann and Hoek, 1912:246 [=Bistramia]
Pizzaroa Eastman, 1913 [misspelling of Pizarroa]
Plachiloma Ferussac, 1835 [misspelling of Pachiloma]
Placocliftonia Havlicek, 1990, in Havlicek and Storch, 1990:60
Placothyris Westphal, 1970:38
Placotriplesia Amsden, 1968:40
Plaesiomys Hall and Clarke, 1892:196
Plagiorhyncha McLearn, 1918:138
Planalvus Carter, 1971:248
Planatrypa Struve, 1966:143 [subgenus of Atrypa]
Planatrypa Copper, 1967:231 [subgenus of Atrypa; junior homonym and junior synonym of Planatrypa Struve; each author based his generic name on the same group species]
Plancella Amsden, 1985:11
Planicardinia Savage, 1968:628
Planidorsa Schuchert and Cooper, 1931:244 [=Cyrtonotella]
Planihaydenella Chang, 1987:757
Planirhynchia Sucic(c)Protic, 1969:19
Planispina Stehli, 1954:331
Planodouvillina Harper and Boucot, 1978:145
Planoharknessella Havlicek, 1950:42 [=Svobodaina per written comm. of Havlicek]
Planoproductus Stainbrook, 1947:310
Planothyris Glushenko, 1975:107
Planovatirostrum Sartenaer, 1970:16
Platidia Costa, 1852:48
Platilites Rafinesque, 1831 [incertae sedis]
Platycancrinella Waterhouse, 1983:126
Platyconcha Waterhouse, 1975:8 [replaced by Biplatyconcha]
Platyglossariorhynchus Sartenaer, 1970:8
Platymena Cooper, 1956:879
Platymerella Foerste, 1909:70
Platyorthis Schuchert and Cooper, 1931:246
Platyrachella Fenton and Fenton, 1924:158 [=Spinocyrtia]
Platyselma Gordon, 1966:575
Platyspirifer Grabau, 1931:355
Platystrophia King, 1850:106
Platyterorhynchus Sartenaer, 1970:5
Platythyris Middlemiss, 1959:109 [replaced by Aniabrochus]
Platytoechia Neuman, 1964:E20
Platytrochalos Jin, 1989:106
Playfairia Reed, 1917:866 [=Rafinesquina]
Plebejochonetes Boucot and Harper, 1968:159
Plectambonites Pander, 1830:90
Plectatrypa Schuchert and Cooper, 1930:279
Plectelasma Cooper and Grant, 1969:17
Plectella Lamansky, 1901 [nomen nudum]; 1905:22
Plectocamara Cooper, 1956:596
Plectoconcha Cooper, 1942:233
Plectodonta Kozlowski, 1929:29
Plectodontella Havlicek, 1953:8'(/0*„(„(∞∞'åPlectoglossa Cooper, 1956:222
Plectoidothyris Buckman, 1914 [nomen nudum]; 1918:122
Plectorhynchella Cooper and Muir(c)Wood, 1951:195 [new name for Monticola]
Plectorthis Hall and Clarke, 1892:194
Plectospira Cooper, 1942:228 [new name for Ptychospira]
Plectospirifer Grabau, 1931:380 [=Adolfia]
Plectosyntrophia Fu, 1982:129
Plectothyrella Temple, 1965:412
Plectothyris Rollier, 1918 [junior homonym and junior objective synonym of Plectothyris Buckman, 1918]
Plectothyris Buckman, 1914 [nomen nudum]; 1918:121
Plectotreta Ulrich and Cooper, 1936:339
Plectotrophia Ulrich and Cooper, 1936:627
Pleiopleurina Schmidt, 1964:506
Plekonella Campbell, 1953:17
Plekonina Waterhouse, 1986:65
Plesicarinatina Mizens, 1977:89
Plesiothyris Douville, 1879:275
Plethorhyncha Hall and Clarke, 1893:191
Plethorhynchus Hall and Clarke, 1893 [misspelling of Plethorhyncha]
Pleuraloma Cooper, 1989:84 
Pleuranisis Rafinesque, 1831 [incertae sedis]
Pleurelasma Cooper and Grant, 1976:2922
Pleurinea Dall, 1877 [misspelling of Pleurinia]
Pleurinia Rafinesque, 1820 [nomen nudum]
Pleurochonetes Isaacson, 1977:175 [subgenus of Chonetes]
Pleurocornu Havlicek, 1961:46
Pleurodium Wang, 1955:345
Pleurohorridonia Dunbar, 1955:90 [=Horridonia]
Pleuropugnoides Ferguson, 1966:1966:354
Pleurorthis Cooper, 1956:329
Pleurothyrella Boucot, Caster, Ives, and Talent, 1963:89
Pleurothyris Cloud, 1942 [replaced by Cloudella]
Plicaea Aisenverg, 1992:130
Plicanoplia Havlicek, 1973 [replaced by Plicanoplites]
Plicanoplia Boucot and Harper, 1968:169
Plicanoplites Havlicek, 1974:170 [new name for Plicanoplia Havlicek, 1973]
Plicarostrum Burri, 1953:281
Plicathyris Khalfin, 1946:57 [=Anathyris]
Plicatifera Chao, 1927:25
Plicatiferina Kalasnhnikov, 1980:45
Plicatocyrtia Gauri, 1965:55
Plicatoderbya Thomas, 1937:14
Plicatolingula Liu, 1979:509
Plicatoria Cooper, 1983:236
Plicatospiriferella Waterhouse and Waddington, 1982:34
Plicatosyrinx Minato, 1952:168
Plicidium Rong and Yang, 1980 [nomen nudum]; 1981:203
Plicigera Bittner, 1890 [group term, no generic validity]
Plicirhynchia Allan, 1947:493
Plicochonetes Paeckelmann, 1930:222
Plicocoelina Boucot and Johnson, 1966:1038
Plicocyrtia Boucot, 1963:704
Plicocyrtina Havlicek, 1956:608
Plicodevonaria Boucot and Harper, 1968:162
Plicogypa Rzonsnitzkaja, 1975:27 [subgenus of Gypidula]
Plicoplasia Boucot, 1959:19
Plicoproductus Ljaschenko, 1969:14
Plicostricklandia Boucot and Ehlers, 1963:55
Plicostropheodonta Sokolskaja, 1960:214
Plicotorynifer Abramov and Solomina, 1970, in Menner et al., 1970:111; in Abramov, 1970:153
Plionoptycherhynchus Sartenaer, 1979:537
Pliothyrina Van Roy, 1980:1
Ploughsharella Liang, 1982, in Wang Guo(c)ping et al., 1982:227
Pocockia Lazarev, 1976:112 [subgenus of Schizophoria]
Podichnus Bromley and Surlyk, 1973 [ichnogenus]
Podolella Kozlowski, 1929:31
Podtsheremia Kalashnikov, 1965 [nomen nudum]; 1966:50
Poikilosakos Watson, 1917:215
Poloniproductus Biernat and Lazarev, 1988:66
Polylasma Popov, 1980, in Nazarov and Popov, 1980:105
Polymorpharia Cooper and Grant, 1975:1143
Polystylus Klets, 1993:123
Polytoechia Hall and Clarke, 1892:239
Pomatospirella Bittner, 1892:26
Pomatotrema Ulrich and Cooper, 1932, in Schuchert and Cooper, 1932:109
Pomeraniotreta Bednarczyk, 1986:415
Pomeromena Mitchell, 1977:112
Pompeckium Havlicek, 1970:290'(00*„(„(∞∞'åPondospirifer Waterhouse, 1978:93
Pontielasma Waterhouse and Piyasin, 1970:163
Pontisia Cooper and Grant, 1969:13
Porambonites Pander, 1830:95
Porambonitoides Xu, 1978:315
Poramborthis Havlicek, 1949:107
Porostictia Cooper, 1955:62
Portneufia Hoover, 1979:7
Portranella Wright, 1964:169
Posicomta Grunt, 1986:120
Postamartinia Wang and Yang, 1993:7
Postepithyris Makridin, 1960, in Licharew et al., 1960:294
Postlobothyrella Tchorszhewsky, 1971 [nomen nudum]
Postrapidothyris Tchorszhewsky, 1973 [nomen nudum]
Pradochonetes Pardo and Garcia(c)Alcalde, 1984:104
Pradoia Comte, 1938:44
Praeangustothyris Koczyrkevicz, 1984:18
Praeargyrotheca Smirnova, 1983, in Smirnova, Zezina, and Popiel(c)Barczyk, 1983:52 
Praecubanothyris Dagys, 1974:187
Praecyclothyris Makridin, 1955:84
Praegibbithyris Sun, 1987:82
Praegnantenia Havlicek, 1961:99
Praegoniothyris Ovtsharenko, 1977 [nomen nudum]; 1983:142
Praegoniothyris Ovtsharenko, 1983:142
Praehorridonia Ustritsky, 1962:57; 1963, in Ustritsky and Tschernjak, 1963:94
Praekirkidium Breivel and Breivel, 1988:54 
Praelacazella Smirnova, 1969:81
Praelacunosella Wisniewska(c)Zelichowska, 1978:109
Praeleiorhynchus Rzonsnitzkaja, 1968; 1973 [nomina nuda]
Praelongithyris Middlemiss, 1959:134
Praemagadina MacKinnon, 1993:338
Praemagas Fischer and Oehlert, 1892 [nomen nudum]
Praemonticlarella Garcia Joral, 1993:75
Praeneothyris Katz, 1962:143
Praenucleata Tchorszhewsky, 1973 [nomen nudum]
Praerhaetina Radulovic and Urosevic, 1988, in Urosevic, 1988:350
Praeudesia Hegab and Tchorszhewsky, 1991:4
Praewaagenoconcha Sokolskaja, 1948:132
Prantilina Havlicek, 1949:250
Prelissorhynchia Xu and Grant, 1994:38
Priambonites Fischer de Waldheim, 1834 [misspelling of Plectambonites]
Primipilaria Struve, 1992:549
Primorewia Licharew and Kotljar, 1978:71
Prionites Fischer de Waldheim, 1834 [misspelling of Pronites]
Prionorhynchia Buckman, 1914 [nomen nudum]; 1918:62
Prionothyris Cloud, 1942:66
Proanadyrella Xu and Liu, 1983:105
Proatribonium Gratsianova, 1967:92
Probolarina Cooper, 1959:37
Probolionia Cooper, 1957:27
Proboscidella Oehlert, 1887, in Fischer, 1887:1277
Proboscidina Isaacson, 1977:192
Proboscidina Branisa, 1965; Boucot, 1975 [nomina nuda; =Proboscidina Isaacson]
Proboscisambon Havlicek and Mergl, 1982:44 
Procarinatina Mizens and Sapelnikov, 1982:18
Procerulina Andronov, 1961:76
Prochlidonophora Thomson and Owen, 1979:28
Prochoristitella Legrand(c)Blain, 1969:220
Proconchidium Sapelnikov, 1969, in Nikolayev and Sapelnikov, 1969:15
Prodavidsonia Havlicek, 1956:564
Producta Conybeare and Phillips, 1822; Sowerby, 1825 [misspelling of Productus]
Productella Hall, 1867:154
Productellana Stainbrook, 1950:374
Productellina Reed, 1943:99
Productelloides Kotlyar, 1985:112
Productina Sutton, 1938:551
Productorthis Kozlowski, 1927:9
Productus Sowerby, 1814:153
Progonambonites Opik, 1934:138
Prokeyserlingina Fredericks, 1916 [hypothetical genus; =Poikilosakos]
Prokopia Havlicek, 1953:5
Prolazutkinia Hou and Xian, 1983, in Xian, 1983:9
Promarginifera Shiells, 1966:428
Pronalivkinia Rukavischnikova, 1977:134 [subgenus of Nalivkinia]
Pronites Pander, 1830 [=Clitambonites]
Propatella Grubb, 1939:558 [=Philhedra]
Properotundirostrum Sartenaer, 1986.:490
Propriopugnus Brunton, 1984:32'(10*„(„(∞∞'åPropygope Bittner, 1890:210
Prorensselaeria Raymond, 1923:468
Proreticularia Havlicek, 1957:247
Prorichthofenia King, 1931:97
Prorugaria Waterhouse, 1982:40
Proschizophoria Maillieux, 1912:177
Prosoponella Li, 1980 [nomen nudum]; Li, 1984:778
Prospira Maxwell, 1954:35
Prosserella Grabau, 1910, in Grabau and Sherzer, 1910:139
Prostricklandia Rukavischnikova and Sapelnikov, 1973:106
Prosyringothyris Fredericks, 1916:51 [=Syringothyris]
Protambonites Havlicek, 1972, in Havlicek and Josopait, 1972:348
Protanidanthus Liao, 1979:537
Protathyris Kozlowski, 1929:30
Protathyrisina Chu, 1974, in Fang and Chu, 1974:458
Protatrypa Boucot, Johnson, and Staton, 1964:809
Proteguliferina Licharew, 1960, in Sarytcheva et al., 1960:236
Protegulorhynchia Owen, 1980:129 
Proteorhynchia Owen, 1981:307
Proteorthis Havlicek, 1974:168
Protoanidanthus Waterhouse, 1986:60 
Protobolus Liu, 1979:507
Protochonetes Muir(c)Wood, 1962:50
Protocortezorthis Johnson, and Talent, 1967:154
Protocymostrophia Harper and Boucot, 1978:127 [subgenus of Mesodouvillina]
Protodouvillina Harper and Boucot, 1978:138
Protogusarella Perry and Chatterton, 1979:317
Protohesperonomia Williams and Curry, 1985:218 
Protoleptostrophia Caster, 1939:75
Protomegastrophia Caster, 1939:36 [subgenus of Megastrophia]
Protomendacella Havlicek, 1970:31
Protonia Link, 1830 [misspelling of Productus]
Protoniella Bell, 1929:110
Protophragmapora Alekseeva, 1967:7
Protoreticularia Su, 1980:323
Protorhyncha Hall and Clarke, 1893:180
Protorthis Hall and Clarke, 1892:232
Protoshaleria Harper and Boucot, 1978:162 [subgenus of Shaleria]
Protosiphon Matthew, 1897:70 [=Trematobolus]
Protoskenidioides Williams, 1974:83
Protosyphon Gorjansky, 1960 [misspelling of Protosiphon]
Protosyringothyris Fredericks, 1918 [misspelling of Prosyringothyris]
Prototegulithyris Almeras, Elmi, and Benshili, 1988:76
Protozeuga Twenhofel, 1913, in Savage, 1913:51
Protozyga Hall and Clarke, 1893:149
Protreta Bell, 1938:405
Psamathopalass Liu, 1979:510
Psebajithyris Tchorszhewsky, 1974:48
Pseudoanisopleurella Xu, 1978:222 [spelled Pseudoanisopeurella in paper]
Pseudoantiquatonia Zhan and Wu, 1982:98
Pseudoathyrisina Chen, 1979:17
Pseudoatrypa Copper, 1973:492
Pseudoaulacothyris Smirnova, 1984 [nomen nudum]; 1990:66
Pseudoavonia Wang, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:312
Pseudobolus Cooper, 1956:194
Pseudobornhardtina Yang, 1977:460
Pseudocamarophoria Wedekind, 1926:197
Pseudocamarotoechia Kulkov, 1974, in Ivanovskii and Kulkov, 1974:53
Pseudochonetes Su, 1976:183
Pseudoconchidium Nikiforova and Sapelnikov, 1971:52
Pseudocrania McCoy, 1851:389
Pseudocyrtina Dagys, 1962:54
Pseudoderbyia Licharew, 1934:213
Pseudodicellomus Bell, 1962, in Bell and Ellinwood, 1962:407
Pseudodicoelosia Boucot and Amsden, 1958:162 [=Rhipidomella]
Pseudodielasma Brill, 1940:317
Pseudodouvillina Stainbrook, 1945:27 [=Nervostrophia]
Pseudogibbirhynchia Ager, 1962:108
Pseudoglossinotoechia Tcherkesova, 1967:9
Pseudoglossothyris Buckman, 1901:240
Pseudogruenewaldtia Rzonsnitzkaja, 1960:46
Pseudohalorella Dagys, 1965:66
Pseudoharttina Licharew, 1934:212
Pseudohaydenella Liang, 1990:175
Pseudohomeospira Nikiforova, 1970:139
Pseudojisuina Liang, 1990:417
Pseudokeyserlingina Fredericks, 1916 [hypothetical genus =Cardinocrania]
Pseudokingena Bose and Schlosser, 1900:177'(20*„(„(∞∞'åPseudokymatothyris Chen, 1979:22 
Pseudolabaia Ching and Ye, 1979:130
Pseudolaballa Dagys, 1974:145
Pseudoleiorhynchus Rozman, 1962:122 [=Trifidorostellum]
Pseudolepismatina Ching and Sun, 1976, in Ching et al., 1976:321
Pseudoleptaena Williams, 1965 [invalid new name for Leptaenella Sokolskaja, 1952, which is a junior objective synonym of Leptagonia]
Pseudoleptaena Miloradovich, 1947:96 [=Leptagonia]
Pseudoleptellina Andreev, 1992:113
Pseudoleptodus Stehli, 1956:311
Pseudolingula Mickwitz, 1909:771
Pseudomagas Makridin and Katz, 1965 [nomen nudum]
Pseudomarginifera Stepanov, 1934:56
Pseudomartinia Leidhold, 1928 [new name proposed for Martinia Waagen, citation unknown; =Martinia]
Pseudometoptoma Huene, 1899:211
Pseudomimella Xu and Liu, 1984:179
Pseudomonticlarella Smirnova, 1987:30
Pseudomonticulifera Zhao and Tan, 1984:26 
Pseudonudirostra Rozman, 1960 [nomen nudum]
Pseudoorthotetes Sokolskaja, 1963, in Sarytcheva et al., 1963:97 [=Orthotetes]
Pseudoparazyga Johnson, 1970:181
Pseudopentagonia Besnossova, 1963, in Sarytcheva et al., 1963:315 [=Composita]
Pseudopholidops Bekker, 1921:64
Pseudoporambonites Zeng, 1977:51
Pseudoprotathyris Modzalevskaja, 1979:59
Pseudopugnax Licharew, 1956, in Kiparisova et al., 1956:56
Pseudopygoides Xu, 1978:303
Pseudorhaetina Sandy, 1994:19
Pseudorostranteris Glushenko, 1975:114
Pseudorugitela Dagys, 1959:100
Pseudosieberella Godefroid, 1972:3
Pseudosinotectirostrum Yudina, 1991:45
Pseudospiriferina Yang and Xu, 1966:41
Pseudospondylospira Hoover, 1991:79
Pseudostrophalosia Clarke, 1970:987
Pseudostrophochonetes Racheboeuf, 1981:40
Pseudostrophomena Roomusoks, 1963:237
Pseudosyringothyris Fredericks, 1916:51
Pseudosyrinx Weller, 1914:405
Pseudotubithyris Almeras, 1971:361
Pseudouncinulus Rzonsnitzkaja, 1968, in Markowskii, 1968:111
Pseudoundispirifer Zhang, 1987:144
Pseudowattonithyris Almeras, 1971:393
Pseudowellerella Licharew, 1956, in Kiparisova et al., 1956:58
Pseudoyunnanella Chen, 1978:336
Psilocamara Cooper, 1956:523
Psilocamerella Fu, 1980:2; 1982:128 
Psilonotus Stehli, 1954 [replaced by Elliottella]
Psiloria Cooper, 1976:282
Psilothyris Cooper, 1955:10
Psioidea Hector, 1879:538
Psioidiella Campbell, 1968:33
Pterophloeus Bittner, 1890 [misspelling of Pterophloius]
Pterophloios Zugmayer, 1880 [misspelling of Pterophloius]
Pterophloius Guembel, 1861 [=Bactrynium]
Pteroplecta Waterhouse, 1978:56
Pterospirifer Dunbar, 1955:128
Ptilorhynchia Crickmay, 1933:877
Ptilotorhynchus Cooper and Grant, 1976:2011
Ptychoglyptus Willard, 1928:283
Ptychomaletoechia Sartenaer, 1961:7
Ptychopeltis Perner, 1903:42
Ptychopleurella Schuchert and Cooper, 1931:244
Ptychospira Hall and Clarke, 1894 [replaced by Plectospira]
Ptyctorhynchia Buckman, 1914 [nomen nudum]; 1918:47
Ptyctothyris Buckman, 1914 [nomen nudum]; 1918:101
Ptygmactrum Cooper and Grant, 1976:1939
Puanatrypa Xian, 1978:302
Puanospirifer Jiang, 1978:302
Pugilis Sarytcheva, 1949:104
Pugilus Sarytcheva, 1952 [invalid new name for Pugilis, Pugilis not preoccupied]
Pugites DeHaan, 1838 [nomen nudum]
Pugnacina Zuong and Rzonsnitzkaja, 1968, in Zuong et al., 1968:43
Pugnaria Biernat and Racki, 1986:95
Pugnax Hall and Clarke, 1893:203
Pugnoides Weller, 1910:512
Pulchratia Muir(c)Wood and Cooper, 1960:250
Pulchrithyris Sahni, 1925:361 [=Carneithyris]
Pulsia Ivanov, 1925:114 [subgenus of Schellwienella]'(30*„(„(∞∞'åPumilus Atkins, 1958:560
Punctatrypa Havlicek, 1953:8
Punctocyrtella Plodowski, 1968:252
Punctolira Ulrich and Cooper, 1936:628
Punctopatella Grubbs, 1939:559 [=Petrocrania]
Punctoproductus Liang, 1980 [nomen nudum]; 1990:369
Punctospirella Dagys, 1974:136
Punctospirifer North, 1920:213
Punctothyris Hyde, 1953:288
Punctspinatrypa Rzonsnitzkaja, 1975:116
Purdonella Reed, 1944:218 [new name for Munella]
Pusillagutta Misius, 1986:210
Pustula Thomas, 1914:259
Pustulatia Cooper, 1956:769 [new name for Pustulina]
Pustulina Cooper, 1942 [invalid new name for Vitulina, Pustulina preoccupied; replaced by Pustulatia]
Pustuloplica Waterhouse, 1968:45
Pustulospiriferina Waterhouse, 1983, in Waterhouse, Campbell and Williams, 1983:303
Pycnobrochus Cooper, 1983:238
Pycnoria Cooper, 1989:51
Pygites Buckman, 1906:449 [new name for Pugites]
Pygmaella Baranov, 1977:80
Pygmochonetes Jing and Hu, 1978:111
Pygope Link, 1830:435
Pyraeneica Sucic(c)Protic, 1971:23
Pyramidalia Nalivkin, 1947:124 [=Cyrtinaella]
Pyramidathyris Hu, 1983:106
Pyramina Ljaschenko, 1969:23
Pyriusina Aksarina, 1992:78
Qianjiangella Liang, 1983, in Liu, Xu, and Liang, 1983:274
Qianomena Rong and Yang, 1980 [nomen nudum]; 1981:173
Qiansispirifer Yang, 1977:423
Qilianoconcha Ching, Sun, and Ye, 1979:166
Qilianotryma Xu, 1979:97
Qinghaispiriferina Sun and Ye, 1982:160
Qinglongia Liao, 1980:270 
Qingthyris Xu and Liu, 1983:126
Qingyenia Yang and Xu, 1966:50
Qinlingia Rong, Zhang and Chen, 1987:71
Qinlingotoechia Fu, 1983, in Zhang, Fu and Ding, 1983:331
Qispiriferina Xu and Liu, 1983:117
Quadranetes Sadlick, 1963 [=Neochonetes]
Quadratia Muir(c)Wood and Cooper, 1960:162
Quadratirhynchia Buckman, 1914 [nomen nudum]; 1918:42
Quadrifarius Fuchs, 1923:854; 1929:195 [=Delthyris]
Quadrikentron Boucot and Gauri, 1966:1023 [subgenus of Strophochonetes]
Quadrisonia Rowell and Henderson, 1978:6
Quadrithyrina Havlicek, 1959:244
Quadrithyris Havlicek, 1957:440
Quadrochonetes Stehli, 1954:309
Quangyuania Sheng, 1975:81
Quasiavonia Brunton, 1966:220 [subgenus of Avonia]
Quasidavidsonia Havlicek, 1987:106
Quasimartinia Havlicek, 1957 [nomen nudum]; 1959:257
Quasistrophonella Harper and Boucot, 1978:98 [subgenus of Strophonella]
Quasithambonia Bednarczyk and Biernat, 1978:303
Quebecia Walcott, 1905:320 [=Yorkia]
Quinquenella Waterhouse, 1975:2
Quiringites Struve, 1992:564
Quizhouspirifer Xian, 1979:116; 1982:69
Quizhouspirifer Xian, 1982:69 [junior homonym of Quizhouspirifer Xian, 1979]
Quondongia Percival, 1991:151
Rackirhynchia Havlicek, 1990:214
Radiatrypa Copper, 1978:293 [subgenus of Variatrypa]
Radimatrypa Havlicek, 1990, in Havlicek and Kukal, 1990:161
Radiomena Havlicek, 1962:471
Rafanoglossa Havlicek, 1980:4
Rafinesquina Hall and Clarke, 1892:282
Rahouiarhynchia Tchoumatchenco, 1987:53
Railtonella Laurie, 1991:63
Rakverina Roomusoks, 1993:161
Ralfia Popov and Khazanovitch, 1989:126
Ralia Lazarev, 1987:48
Rallacosta Cooper and Grant, 1976:2278
Ramavectus Stehli, 1954:327
Ramovsina Sremac, 1986:14
Ranorthis Opik, 1939:119
Raridium Sapelnikov and Mizens, 1987:56
Rariella Zhang, 1981:386'(40*„(„(∞∞'åRarithyris Tchorszhewsky, 1989:79
Rastelligera Hector, 1879:538
Ratburia Yanagida, 1971:85
Rauffia Schulz, 1914:371 [replaced by Hessenhausia]
Rauna Opik, 1932 [replaced by Raunites]
Raunites Opik, 1939:135 [new name for Rauna]
Ravozetina Havlicek, 1974:169
Rawdonia Peou, 1979:190
Raymondella Bancroft, 1933 [nomen nudum]
Raymonella Whittington, 1938 [replaced by Bancroftina]
Rebrovia Popov and Khazanovitch, 1989:112
Rectambitus Xu and Grant, 1994:50
Rectigypidula Zhang, 1987:108
Rectirhynchia Buckman, 1918:74
Rectithyris Sahni, 1929:9
Rectotrophia Bates, 1968:176
Redlichella Walcott, 1908:90
Reedoconcha Kotljar, 1964:124 [subgenus of Productus]
Reeftonella Boucot, 1959:768
Reeftonia Allan, 1947:436
Reflexia Rotai, 1931:24
Regelia Crickmay, 1952:2 [=Cyrtospirifer]
Regrantia Martinez and Winkler, 1985 [nomen nudum]
Reinversella Bates, 1968:169
Remnevitoechia Gratsianova, 1970, in Alekseeva et al., 1970:97
Renaudia Racheboeuf, 1976:71 [subgenus of Eodevonaria]
Rensselaeria Hall, 1859:38
Rensselaerina Dunbar, 1917:469
Rensselandia Hall, 1867:385
Rensselandioidea Yang, 1980 [nomen nudum]; 1983:34
Replicoskenidioides Potter, 1990:12
Resserella Bancroft, 1928:54
Retaria Muir(c)Wood and Cooper, 1960:231
Retichonetes Muir(c)Wood, 1962:63
Reticularia McCoy, 1844:143
Reticulariina Fredericks, 1916:16
Reticulariopsis Fredericks, 1916:17
Reticulatia Muir(c)Wood and Cooper, 1960:284
Reticulatochonetes Bublichenko, 1956:97
Reticulatrypa Savage, 1970:663
Retimarginifera Waterhouse, 1970:123
Retroplexus Brunton and Mundy, 1988:74
Retrorsirostra Schuchert and Cooper, 1931:244 [subgenus of Plaesiomys]
Retzia King, 1850:137
Retziella Nikiforova, 1937:83 [=Rhynchospirina]
Retzispirifer Kulkov, 1960:929
Reuschella Bancroft, 1928:180
Reushella Alichova, 1960 [misspelling of Reuschella]
Reveroides Sapelnikov, 1976:3
Reversella Liang, 1983, in Liu, Xu, and Liang, 1983:274
Rhabdostrophia Neuman, 1989:68
Rhactomena Mitchell, 1977:111
Rhactorhynchia Buckman, 1914 [nomen nudum]; 1918:50
Rhactorthis Williams, 1963:372
Rhaetina Waagen, 1882:334
Rhaetinopsis Yang and Xu, 1966:80
Rhamnaria Muir(c)Wood and Cooper, 1960:119
Rhapidothyris Tuluweit, 1965:72
Rhenorensselaeria Kegel, 1913:127
Rhenospirifer Mittmeyer, 1972:99 [subgenus of Euryspirifer]
Rhenostrophia Boucot, 1960:483 [subgenus of Strophodonta]
Rhenothyris Struve, 1970:460
Rhinobolus Hall and Clarke, 1892 [misspelling of Rhynobolus]
Rhinotreta Holmer, 1986:113
Rhipidium Schuchert and Cooper, 1931:249
Rhipidomella Oehlert, 1890:372 [new name for Rhipidomys]
Rhipidomelloides Boucot and Amsden, 1958:165 [=Rhipidomella]
Rhipidomena Cooper, 1956:867
Rhipidomys Oehlert, 1887 [replaced by Rhipidomella]
Rhipidothyris Cooper and Williams, 1935:847
Rhizothyris Thomson, 1915:399
Rhombaria Cooper, 1983:215 
Rhomboidella Sucic(c)Protic, 1985:30
Rhombospirifer Duan and Li, 1985:134
Rhombothyris Middlemiss, 1959:99
Rhondellina Rowell, 1986:1059
Rhynchatrypa Siehl, 1962:199 [=Dubaria]
Rhynchocamara Schuchert and Cooper, 1931:248 [=Camerella]'(50*„(„(∞∞'åRhynchoferella Spriestersbach, 1942:199
Rhynchonella Fischer de Waldheim, 1809:35
Rhynchonellina gemmellaro, 1871:102
Rhynchonellis Keferstein, 1828 [misspelling of Rhynchonella]
Rhynchonelloidea Buckman, 1914 [nomen nudum]; 1918:38
Rhynchonelloidella Muir(c)Wood, 1936:49
Rhynchonellopsis Gregorio, 1930 [replaced by Sulcirostra]
Rhynchonellopsis Vincent, 1893:50
Rhynchonellopsis Bose, 1894 [replaced by Capillirostra]
Rhynchopora King, 1865:124
Rhynchoporina Oehlert, 1887 [invalid new name for Rhynchopora, Rhynchopora not preoccupied]
Rhynchora Dalman, 1828:136
Rhynchorina Oehlert, 1887, in Fischer, 1887:1326
Rhynchorthis Bates, 1968:160
Rhynchospira Hall, 1859 [replaced by Rhynchospirina]
Rhynchospirifer Paulus, 1957:51 [=Prosserella]
Rhynchospirina Schuchert and LeVene, 1929:121 [new name for Rhynchospira]
Rhynchotetra Weller, 1910:506
Rhynchotrema Hall, 1860:68
Rhynchotreta Hall, 1879:166
Rhynchotretaoides Severgina, 1967:136
Rhynchotretina Khalfin, 1948:175
Rhynchura Agassiz, 1848 [misspelling of Rhynchora]
Rhyncospira Hall, 1859 [misspelling of Rhynchospira]
Rhynobolus Hall, 1871:5
Rhynoleichus Abramov and Grigorjewa, 1983:95
Rhyselasma Yadrenkina, 1972:177
Rhysostrophia Ulrich and Cooper, 1936:630
Rhysotreta Cooper, 1956:259
Rhyssochonetes Johnson, 1970:2095
Rhytialosia Lazarev, 1989:38
Rhytibulbus Li, 1991, in Ding et al., 1991:156
Rhytidorhachis Jin and Caldwell, 1990:32
Rhytiophora Muir(c)Wood and Cooper, 1960:192
Rhytirhynchia Cooper, 1957:8
Rhytisia Cooper and Grant, 1975:967
Rhytisoria Cooper, 1983:239
Rhytistrophia Caster, 1939:86 [=Leptostrophia]
Richthofenia Kayser, 1881:351
Rictia Gregorio, 1930:27
Rigauxia Brice, 1988:372
Rigbyella Stehli, 1956:310
Rimirhynchia Buckman, 1914 [nomen nudum]; 1918:60
Rimirhynchopsis Dagys, 1963:71
Riograndella Kobayashi, 1937:422
Rionirhynchia Kvakhadze, 1971 [nomen nudum]
Rionirhynchia Kamyschan and Kvakhadze, 1980:72 
Riorhynchia Jassjukevitch, 1974:108
Riorhynchia Jassjukevitch 1974:108
Rioultina Pajaud, 1966:631
Ripidiorhynchus Sartenaer, 1966:2
Robertorthis Havlicek, 1977:51
Robinsonella Moisseiev, 1936:45
Robustirhynchia Seifert, 1963:174
Rochatorhynchia Katz, 1962:132
Rocheithyris Almeras, 1971:345
Rochtex Havlicek, 1990, in Havlicek and Kukal, 1990:175
Roemerella Hall and Clarke, 1890:137
Romingerina Hall and Clarke, 1893:271
Rorespirifer Waterhouse and Piyasin, 1970:156
Rosella Andreeva, 1972:52
Rosobolus Havlicek, 1982:18
Rossella Jones, 1978 [replaced by Nanukidium]
Rossirhynchus Gaetani, 1964:638
Rossithyris Owen, 1980:138 
Rostranteris Gemmellaro, 1898 [nomen nudum]; 1899:104
Rostricellula Ulrich and Cooper, 1942:626
Rostrirhynchia Sucic(c)Protic, 1969:47
Rostrospirifer Grabau, 1931:407 [=Euryspirifer]
Rotaia Rzonsnitzkaja, 1959:30 [new name for Welleria Rotai, 1941]
Rotundostrophia Gratsianova, 1960, in Khalfin, 1960:439
Rouillieria Makridin, 1960, in Licharew et al., 1960:295
Rowellella Wright, 1963:233
Rowleyella Weller, 1911:448 [=Camarospira]
Rozmanaria Weyer, 1972:85
Rudinia Muir(c)Wood and Cooper, 1960 [=Desmoinesia]
Rudirhynchia Buckman, 1914 [nomen nudum]; 1918:44
Ruegenella Owen, 1977:224'(60*„(„(∞∞'åRufispirifer Havlicek, 1987:242 
Rugaltarostrum Sartenaer, 1961:6
Rugaria Cooper and Grant, 1969:5
Rugatia Muir(c)Wood and Cooper, 1960:286
Rugauris Muir(c)Wood and Cooper, 1960:193
Rugia Steinich, 1963:735
Rugicostella Muir(c)Wood and Cooper, 1960:167
Rugitela Muir(c)Wood, 1936:121
Rugithyris Buckman, 1915 [nomen nudum]; 1918:127
Rugivestis Muir(c)Wood and Cooper, 1960:235
Rugoclostus Easton, 1962:59
Rugoconcha Ching and Sun, 1979 [nomen nudum]
Rugoconcha Jing and Sun, 1981:133
Rugoleptaena Havlicek, 1956:558
Rugolepyros Lenz, 1989:1224
Rugomena Roomusoks, 1993:115
Rugosatrypa Rzonsnitzkaja, 1975:98
Rugosochonetes Sokolskaja, 1950:23
Rugosomarginifera Xu, 1987:224
Rugosothyris Zhang, 1987:150
Rugosowerbyella Mitchell, 1977:83 [subgenus of Sowerbyella]
Rugostrophia Neuman, 1971:119
Rugulatia Sokolskaja, 1952, in Sarytcheva and Sokolskaja, 1952:187 [=Licharewia]
Rurambonites Cocks and Rong, 1989:118
Russiella Makridin, 1964:288
Russirhynchia Buckman, 1914 [nomen nudum]; 1918:52
Rustella Walcott, 1905:311 [=Kutorgina]
Ruthenia Fredericks, 1928 [=Waagenoconcha]
Ruthiphiala Carter, 1988:30
Rutorhynchia Sun, 1981:201 
Rutrumella Harper, 1981, in Bruton and Harper, 1981:164
Ryocarhynchus Sartenaer, 1984:8 
Rzonsnickiana Mamedov, 1976:121
Saccogonum Havlicek, 1971:27
Saccorhynchia Ching, Sun, and Ye, 1979:154
Sacothyris Ching, Sun, and Ye, 1979:214
Sacothyropsis Chen, Rao, Zhao and Pan, 1986:76 
Saetosina Waterhouse, 1986:54
Sagueresia Mohanti, 1972:172
Saharonetes Havlicek, 1984:64
Sajakella Nasikanova, 1968, in Sarytcheva, 1968:141
Sakawairhynchia Tokuyama, 1957:126
Salacorthis Williams, 1974:79
Salairella Severgina, 1984:45
Salairina Alekseeva, 1970, in Alekseeva et al., 1970:131
Salairotoechia Rzonsnitzkaja, 1968, in Markowskii, 1968:123
Salanygolina Ushatinskaia, 1987:63
Salgirella Moisseiev, 1936:48
Salonia Cooper and Whitcomb, 1933:496
Salopia Williams, 1955, in Whittington and Williams, 1955:409
Salopina Boucot, 1960:3
Salopinella Yang and Rong, 1980 [nomen nudum]; 1982:422
Sampo Opik, 1933, 35
Sandia Sutherland and Harlow, 1973:41
Sandrella Waterhouse, 1986:212
Sanjuanella Benedetto and Herrera, 1987:103
Sanjuanetes Racheboeuf and Herrera, 1994:543
Sanjuania Amos, 1958:841
Sanqiaothyris Yang and Xu, 1966:83
Sanxiaella Rong and Chang, 1981, in Chang, 1981:558
Sapelnikovia Boucot and Johnson, 1979:118 [=Reveroides]
Sapelnikovia Boucot, 1975 [nomen nudum; =Sapelnikovia Boucot and Johnson, 1979]
Sardope Dieni et al., 1975:196
Sardorhynchia Ruggiero and Ungaro, 1983:228
Sarganostega Cooper and Grant, 1969:15
Sarytchevinella Waterhouse, 1983:126
Sasyksoria Popov and Holmer, 1994:135
Satpakella Koneva, Popov, and Ushatinskaia, 1990, in Koneva, Popov, Ushatinskaia, and Esakova, 1990:162
Saucrobrochus Cooper, 1983:145
Saucrorthis Xu, Rong, and Liu, 1974:151
Saughina Bancroft, 1949:7 [=Fardenia]
Saukrodictya Wright, 1964:219
Savageina Boucot, 1975:355 [subgenus of Anastrophia]
Scacchinella Gemmellaro, 1891:23
Scalpellirhynchia Muir(c)Wood, 1936:477
Scambocris Liu, 1979:507
Scamnomena Bassett, 1977:134
Scapharina Cooper and Grant, 1975:895'(70*„(„(∞∞'åScaphelasma Cooper, 1956:260
Scaphiocoelia Whitfield, 1891:107
Scaphorthis Cooper, 1956:502
Scelenella Hall and Clarke, 1893:271
Sceletonia Cooper and Grant, 1974:406
Scenesia Cooper and Grant, 1976:2757
Scenidium Oehlert, 1887 [misspelling of Skenidium]
Schachriomonia Nikiforova, 1978:118
Schalidomorthis Bassett, 1981:650
Schedophyla Neuman, 1971:122
Schegultania Andronov, 1961 [nomen nudum]
Schellwienella Thomas, 1910:92
Schistochonetes Roberts, 1971:54
Schizambon Walcott, 1884:70
Schizambonia Oehlert, 1887 [improper emendation of Schizambon]
Schizobolus Ulrich, 1886:26
Schizocrania Hall and Whitfield, 1875:71
Schizonema Foerste, 1909 [replaced by Schizoramma]
Schizopholis Waagen, 1885:753
Schizophorella Reed, 1917:858
Schizophoria King, 1850:106
Schizopleuronia Liao, 1983:638
Schizoramma Foerste, 1912:139 [new name for Schizonema]
Schizoria Cooper, 1989:54
Schizospirifer Grabau, 1931:353
Schizostrophia Fu, 1980:2 
Schizostrophina Fu, 1982:132 [=Schizostrophia] 
Schizotreta Kutorga, 1848:274
Schizotretinia Havlicek, 1994:61
Schizotretoides Termier and Monod, 1978:151
Schmidtia Volborth, 1869 [replaced by Schmidtites]
Schmidtites Schuchert and LeVene, 1929:121 [new name for Schmidtia]
Schmidtomena Roomusoks, 1989:115
Schnurella Schmidt, 1964:505
Schnuria Clarke, 1889 [nomen nudum]
Schrenkiella Barchatova, 1970 [nomen nudum]; 1973:97
Schuchertella Girty, 1904:734
Schuchertellopsis Maillieux, 1939:5
Schuchertia Fredericks, 1926 [replaced by Striispirifer]
Schuchertina Walcott, 1905:323
Schwagerispira Dagys, 1972:101
Scissicosta Lazarev, 1992, in Lazarev and Suur'suren, 1992:65
Scoloconcha Gordon, 1966:583
Sculptospirifer Su, 1980:318
Scumulus Steinich, 1968:199
Scutepustula Sarytcheva, 1963, in Sarytcheva et al., 1963:165
Securina Voros, 1983:23
Securithyris Voros, 1983:13
Sedenticellula Cooper, 1942:231
Sedjulina Ljaschenko, 1985:17
Selenella Li, 1980[invalid, pre(c)occupied by Selenella Hall and Clarke, 1893]; [replaced by Gyroselenella]
Selennjachia Baranov, 1982:45
Sellithyris Middlemiss, 1959:113
Selloproductus Termier, Termier, Lapparent, and Marin, 1974:143
Semenewia Paeckelmann, 1930:224
Semibrachythyrina Yang and Ting, 1962, in Yang et al., 1962:104
Semicostella Muir(c)Wood and Cooper, 1960:195
Semigublerina Liang, 1990:230
Semileptagonia Karapetov, 1971:60
Semilingula Popov, 1990, in Egorov and Popov, 1990:113
Semilunataproductus Han, 1987, in Han et al., 1987:317
Seminucella Carter, 1987:26 [subgenus of Spinocarinifera]
Seminula McCoy, 1844:158 [=Composita]
Semiotoechia Ljaschenko, 1973:44
Semiplanella Sarytcheva and Legrand(c)Blain, 1977:79
Semiplanus Sarytcheva, 1952, in Sarytcheva and Sokolskaja, 1952:119
Semiproductus Bublichenko, 1956:99
Semitreta Biernat, 1973:75
Sendaithyris Hatai, 1940:253
Senokosica Sucic(c)Protic, 1971:28
Sentolunia Havlicek, 1967:53
Sentosia Muir(c)Wood and Cooper, 1960:196
Sentosioides Lazarev, 1992, in Lazarev and Suur'suren, 1992:69
Septacamarella Glushenko, 1975:101
Septacamera Stepanov, 1937:146
Septacatazyga Distler, 1972 [nomen nudum]
Septachonetes Chatterton, 1973:76
Septalaria Leidhold, 1928:38'(80*„(„(∞∞'åSeptalariopsis Chen, 1978:331
Septaliphoria Leidhold, 1921:354
Septaliphorioidea Yang and Xu, 1966:29
Septalirhynchia Xu and Liu, 1980 [nomen nudum] 
Septamphiclina Jin and Fang, 1977:57
Septaparmella Su, 1976:185
Septarinia Muir(c)Wood and Cooper, 1960:252
Septasteges Waterhouse and Piyasin, 1970:120
Septathyris Boucot, Johnson, and Staton, 1964:819
Septatoechia Lobatscheva and Titova, 1977:102
Septatrypa Kozlowski, 1929:30
Septemirostellum Roberts, 1971:132
Septicollarina Zezina, 1981:16
Septiconcha Termier, Termier, Lapparent, and Marin, 1974:125
Septirhynchia Muir(c)Wood, 1935:106
Septocamera Licharew, 1960 [misspelling of Septacamera]
Septocrurallia Makridin, 1954 [nomen nudum]
Septocrurella Wisniewska, 1932:65
Septocrurethyris Askerov, 1964; 1965; 1967 [nomina nuda]
Septocyclothyris Xu, 1978:282
Septoheteralosia Ma, 1980 [nomen nudum]
Septomena Roomusoks, 1989:115
Septoproductus Frech, 1911:132 [=Tschernyschewia]
Septorthis Hints, 1973:251
Septospirifer Waterhouse, 1971, in Bamber and Waterhouse, 1971:222
Septospirigerella Grunt, 1965, in Ruzhentsev and Sarytcheva, 1965:237
Septosyringothyris Vandercammen, 1955:2
Septothyris Cooper and Williams, 1935:849
Septulirhynchia Almeras, 1966:110
Seratrypa Copper, 1967:132 [subgenus of Desquamatia]
Serbarinia Morozov, 1985:115
Serbiorhynchia Radulovic, 1991:16
Serbiothyris Sucic(c)Protic, 1971:25
Sergospirifer Ivanova, 1952, in Sarytcheva and Sokolskaja, 1952:190
Sergunkovia Nalivkin, 1979:129
Sericoidea Lindstrom, 1953:134
Serratocrista Brunton, 1968:39
Serrulatrypa Havlicek, 1977:299
Seseloidia Grant, 1993:10
Sestropoma Cooper and Grant, 1969:8
Setigerella Girty, 1938 [replaced by Setigerites]
Setigerites Girty, 1939:141 [new name for Setigerella]
Settedabania Abramov, 1970:148
Severella Sapelnikov, 1963:15 [subgenus of Brooksina]
Severginella Rozman, 1981:122
Shagamella Boucot and Harper, 1968:167
Shaleria Caster, 1939:34
Shaleriella Harper and Boucot, 1978:160
Shanxiproductus Duan and Lee, 1985, in Lee and Duan, 1985:232
Sharpirhynchia Shi and Grant, 1993:49
Shiqianella Xian, 1978:272
Shiragia Kobayashi, 1935:70 [=Bohemiella]
Shishapangmaella Yang, 1983, in Yang and Fan, 1983:273
Shizotreta Davidson, 1856 [misspelling of Schizotreta]
Shlyginia Nikitin and Popov, 1983:237
Shoshonorthis Jaanusson and Bassett, 1993:51
Shouxianella Liu, 1983, in Liu, Xu, and Liang, 1983:256
Shovdolella Rozman, 1992:22
Shrockia Boucot and Smith, 1978:268
Shroshaerhynchia Ovtsharenko, 1977 [nomen nudum]
Shumardella Weller, 1910:512
Siberiothyris Dagys, 1968:128
Siberistrophia Astashkina, 1970:131
Sibiratrypa Rzonsnitzkaja, 1975:100
Sibiria Gorjansky, 1977, in Pelman, 1977:47; in Gorjansky, 1977:99
Sibirirhynchia Rzonsnitzkaja, 1968:171
Sibirispira Alekseeva, 1968:198
Sibiritoechia Alekseeva, 1966:1147
Sicelia Gortani and Merla, 1934:284 [new name for Gemmellaria]
Sichuanatrypa Xian, 1980 [nomen nudum]
Sichuanothyris Shen, He and Zhu, 1992:191
Sichuanrhynchus Tong, 1978:243
Sicorhyncha Havlicek, 1961:28
Sicularia Grant, 1993:11
Sicyusella Liang, 1990:383
Sieberella Oehlert, 1887, in Fischer, 1887:1311
Sieberelloides Rzonsnitzkaja, 1975:20
Sieberina Andronov, 1961 [=Gypidulina]'(90*„(„(∞∞'åSigmelasma Potter, 1990:24
Sigopallus Liu and Liu, 1985:233 
Sikasella Nalivkin, 1979:156
Silesiathyris Brugge, 1977:664
Similoleptaena Roomusoks, 1989:114
Simplicarina Cooper and Grant, 1975:966
Simplicithyris Zezina, 1976:101
Sinoatrypa Wang and Xu, 1981 [nomen nudum] 
Sinochonetes Wang, Boucot, and Rong, 1981:289
Sinocyrtiopsis Gatinaud, 1949:491 [=Cyrtiopsis]
Sinoglossa Mei, 1993:415
Sinoproductella Wang, 1955:350
Sinoproductus Chan, 1962 [=Monticulifera]
Sinopunctatrypa Wang, Copper, and Rong, 1983:1081 [new subgenus of Punctatrypa]
Sinorhynchia Yang and Xu, 1966:32
Sinorthis Wang, 1955:328
Sinoshaleria Xian, 1978:268
Sinospirifer Grabau, 1931:231 [=Cyrtospirifer]
Sinostrophia Hamada, 1968 [nomen nudum]; 1971:52
Sinotectirostrum Sartenaer, 1961:3
Sinothyris Minato, 1953:68 [=Reticularia]
Sinotrimerella Li, 1980 [nomen nudum]; Li and Han, 1980:13
Sinuatella Muir(c)Wood, 1928:37
Sinucosta Dagys, 1963:104
Sinucostella Xu and Liu, 1983:108
Sinuplicorhynchia Dagys, 1965:56
Sinusella Sucic(c)Protic, 1985:26
Siphonobolus Havlicek, 1982:61
Siphonosia Cooper and Grant, 1975:1188
Siphonotreta Verneuil, 1845:286
Siphonotretella Popov and Holmer, 1994:84
Sivorthis Jaanusson and Bassett, 1993
Skelidorygma Carter, 1974:692
Skenidioides Schuchert and Cooper, 1931:243
Skenidium Hall, 1860:70
Slavinithyris Tchorszhewsky, 1986:115
Slovenirhynchia Siblik, 1967:159
Smeathenella Bancroft, 1928:177
Smirnovaena Nekvasilova, 1985:101
Smirnovina Calzada, 1985:88
Snezhnorhynchia Smirnova, 1984 [nomen nudum]; 1990:26
Soaresirhynchia Almeras, 1994:26
Socraticum Gregorio, 1930:25
Sogxianthyris Sun, 1981:235
Sokolskya Aisenverg, 1980:55
Solidipontirostrum Sartenaer, 1970:22
Solitudinella Godefroid, 1991:108
Somalirhynchia Weir, 1925:80
Somalitela Muir(c)Wood, 1935:140
Somalithyris Muir(c)Wood, 1935:124
Sommeria Archbold, 1981 [replaced by Sommeriella]
Sommeriella Archbold, 1982:10 [new name for Sommeria] [subgenus of Neochonetes]
Sonculina Misius, 1986:111 
Songzichonetes Yang, 1984:210
Soudleyella Bancroft, 1945:209 [=Onniella]
Sowerbina Fredericks, 1928:778 [=Horridonia]
Sowerbyella Jones, 1928:384
Sowerbyites Teichert, 1937:66
Spanodonta Prendergast, 1935:13
Spasskothyris Smirnova, 1975:74
Speciothyris Jing and Sun, 1981 [nomen nudum]
Sphaerathyris Baranov, 1994:34
Sphaerirhynchia Cooper and Muir(c)Wood, 1951:195 [new name for Wilsonella]
Sphaerobolus Matthew, 1895:263 [=Lingulobolus]
Sphaeroidothyris Buckman, 1914 [nomen nudum]; 1918:115
Sphenalosia Muir(c)Wood and Cooper, 1960:88
Sphenarina Cooper, 1959:63
Sphenophragmus Imbrie, 1959:365
Sphenorhynchia Buckman, 1914 [nomen nudum]; 1918:30
Sphenorthis Grubbs, 1939:555
Sphenospira Cooper, 1954:330
Sphenosteges Muir(c)Wood and Cooper, 1960:108
Sphenotreta Cooper, 1956:663
Sphriganaria Cooper, 1989:102
Spinarella Cooper and Grant, 1975:1059
Spinatrypa Stainbrook, 1951:196 [new name for Hystricina]
Spinatrypina Rzonsnitzkaja, 1964:101
Spinauris Roberts, 1971:107'(:0*„(„(∞∞'åSpinella Talent, 1956:21
Spinifrons Stehli, 1954:318
Spinilingula Cooper, 1956:210
Spinocarinifera Roberts, 1971:100
Spinochonetes Rong, Xu, and Yang, 1974:204
Spinocyrtia Fredericks, 1916:18
Spinocyrtina Fredericks, 1916:18 [=Cyrtina]
Spinolepismatina Dagys, 1974:147
Spinolyttonia Sarytcheva, 1964:69
Spinomarginifera Huang, 1932:19
Spinomartinia Waterhouse, 1968:53
Spinoplasia Boucot, 1959:18
Spinorthis Wright, 1964:185
Spinorugifera Roberts, 1976:50
Spinospirifer Martynova, 1961:107
Spinospirifer Biernat, 1966:117
Spinosteges Liang, 1990:156
Spinostrophia Jiang, 1978:267
Spinulicosta Nalivkin, 1937:49
Spinuliplica Campbell, 1961:442
Spinulothele Rowell, 1977:76
Spinulothyris Antostschenko, 1973:112
Spirelytha Fredericks, 1924:304
Spiridiophora Sarytcheva, 1960 [misspelling of Spyridiophora]
Spirifer Sowerby, 1818:41
Spirifera Murray, 1831; Sowerby, 1835 [misspelling of Spirifer]
Spiriferella Tschernyschew, 1902:121
Spiriferellaoides Lee, Gu, and Li, 1980:26 
Spiriferellina Fredericks, 1924:299
Spiriferelloides Lee, Gu, and Li 1985:125
Spiriferina Orbigny, 1847:268
Spiriferinaella Fredericks, 1926:407
Spiriferinoides Tokuyama, 1957:101
Spiriferus Blainville, 1827 [misspelling of Spirifer]
Spirigera Orbigny, 1847 [invalid new name for Athyris, Athyris not preoccupied]
Spirigerella Waagen, 1883:452
Spirigerellina Dagys, 1974:160
Spirigerina Orbigny, 1847:268
Spirinella Johnston, 1941:161
Spirisosium Gregorio, 1930:23
Spirithyris Quenstedt, 1868 [nomen nudum]; =Athyris]
Spiropunctifera Ivanova, 1971:120
Spitispirifer Waterhouse and Gupta, 1986:48
Spitzbergenia Kotljar, 1977:155
Spondilobolus Gorjansky, 1960 [misspelling of Spondylobolus]
Spondyglossella Havlicek, 1980:5
Spondylobolus McCoy, 1851:408
Spondylobus Davidson, 1853; Dall, 1870 [misspelling of Spondylobolus]
Spondylopyxis Johnson, Boucot, and Murphy, 1976:47
Spondylospira Cooper, 1942:232
Spondylospiriferina Dagys, 1972:38 [subgenus of Pennospiriferina]
Spondylostrophia Kulkov, 1967:33
Spondylothyris Su, 1980:325
Spondylotreta Cooper, 1956:255
Spuriosa Cooper and Grant, 1975:898
Spurispirifer Havlicek, 1971:27
Spyridiophora Cooper and Stehli, 1955:471
Squamaria Muir(c)Wood and Cooper, 1960:288
Squamathyris Modzalevskaja, 1981:153 
Squamatina Havlicek and Racheboeuf, 1979:109
Squamilingulella Xu, 1978:285
Squamiplana Sucic(c)Protic, 1971:8
Squamirhynchia Buckman, 1914 [nomen nudum]; 1918:63
Squamularia Gemmellaro, 1899:192 [=Phricodothyris]
Squamulariina Fredericks, 1916:19
Stainbrookia Cooper and Dutro, 1982:39
Stauromata Hoover, 1981:52 
Stegacanthia Muir(c)Wood and Cooper, 1960:198
Stegerhynchops Amsden, 1978:27
Stegerhynchus Foerste, 1909:97
Stegocornu Durkoop, 1970:185
Stegorhynchella Rzonsnitzkaja, 1959:27
Stegospira Fu, 1982:167; 1984:374
Steinhagella Goldring, 1957:223
Stelckia Crickmay, 1963:21
Stenaulacorhynchus Sartenaer, 1968:3
Stenobrochus Cooper, 1983:269
Stenocamara Cooper, 1956:602'(;0*„(„(∞∞'åStenochisma Schuchert, 1897; Grabau and Shimer, 1909 [improper emendation of Stenoscisma]
Stenocisma Hall, 1847 [improper emendation of Stenoscisma]
Stenoglossariorhynchus Sartenaer, 1970:6
Stenogmus Cooper, 1983:149 
Stenometoporhynchus Sartenaer, 1987:126
Stenopentamerus Boucot and Johnson, 1979:111 [subgenus of Harpidium]
Stenopentamerus Boucot, 1975 [nomen nudum; =Stenopentamerus Boucot and Johnson, 1979]
Stenorhynchia Brice, 1981:195
Stenorhynchites Havlicek, 1990, in Havlicek and Storch, 1990:145
Stenorina Cooper, 1989:91
Stenosarina Cooper, 1977:95
Stenoschisma Oehlert, 1887; Hall and Clarke, 1894 [improper emendation of Stenoscisma]
Stenoscisma Conrad, 1839:59
Stepanoconchus Lazarev, 1985:69
Stepanoviella Zavodowsky, 1960:336 [=Globiella]
Stepanoviina Zavodowsky, 1968, in Markowskii, 1968:170
Stereochia Grant, 1976:150
Stethothyris Thomson, 1918:23
Stichotrophia Cooper, 1948:473
Stictozoster Grant, 1976:96
Stilpnotreta Henderson and MacKinnon, 1981:297 
Stiphrothyris Buckman, 1915 [nomen nudum]; 1918:109
Stipulina Muir(c)Wood and Cooper, 1960:200
Stita Gregorio, 1930:32 [subgenus of Lyttonia; =Adriana]
Stolmorhynchia Buckman, 1914 [nomen nudum]; 1918:46
Stolzenburgiella Bittner, 1903:508
Straelenia Maillieux, 1935:12
Streptaria Cooper, 1959:39
Streptis Davidson, 1881:150
Streptopomum Havlicek, 1967:207
Streptorhynchus King, 1850:107
Striarina Cooper, 1973:7
Striatifera Chao, 1927:94
Striatochonetes Mikrjukov, 1968, in Markowskii, 1968:90
Striatoproductella Krylova, 1962, in Krylova and Menner, 1962:94; Krylova, 1962:55
Striatoproductus Nalikvkin, 1947:75 [=Devonoproductus]
Striatopugnax Chen, 1978:322
Striatorhynchus Pushkin, 1986:91 
Striatospica Waterhouse, 1975:11
Stricklandia Billings, 1859:134
Stricklandiella Sapelnikov and Rukavischnikova, 1973:36
Stricklandinia Billings, 1863 [invalid new name for Stricklandia, Stricklandia not preoccupied]
Stricklandistrophia Sapelnikov and Rukavischnikova, 1975:96
Strigirhynchia Cooper and Grant, 1969:14
Strigocephalus Defrance, 1827 [misspelling of Strygocephale]
Strigospina Liao, 1979:536
Striirhynchia Buckman, 1914 [nomen nudum]; 1918:68
Striirichthofenia Lu, 1982:609
Striispirifer Cooper and Muir(c)Wood, 1951:195 [new name for Schuchertia]
Striithyris Muir(c)Wood, 1935:129
Stringocephalus Defrance, 1825, in Blainville, 1825:511; Sandberger, 1842 [misspelling of Strygocephale; however ICZN opinion 807 validated spelling]
Stringodiscus Struve, 1982:221 [subgenus of Stringocephalus]
Stringomimus Struve, 1965:461 [subgenus of Geranocephalus]
Striochonetes Waterhouse and Piyasin, 1970:106
Strixella Boucot and Amsden, 1958:170 [=Rhipidomella]
Strongylobrochus Cooper, 1983:155
Strongyloria Cooper, 1989:63
Strophalosia King, 1844:313
Strophalosiella Licharew, 1935:372
Strophalosiina Licharew, 1935:369
Stropheodonta Hall, 1852 [misspelling of Strophodonta]
Stropheria Rafinesque, 1820 [nomen nudum]
Strophesia Rafinesque, 1831 [nomen nudum]
Strophiodonta Paetel, 1875 [misspelling of Strophodonta]
Strophochonetes Muir(c)Wood, 1962:40
Strophodonta Hall, 1850:348
Stropholosia Gray, 1848 [misspelling of Strophalosia]
Strophomena Rafinesque, 1824, in Blainville, 1824:302
Strophomene Bayle, 1878 [misspelling of Strophomenes]
Strophomenes Rafinesque, 1820 [nomen nudum]
Strophonella Hall, 1879:154
Strophonellites Havlicek, 1967:184
Strophonelloides Caster, 1939:106
Strophopleura Stainbrook, 1947:324
Strophoprion Twenhofel, 1914:25 [=Strophonella]
Strophoproductus Nalivkin, 1937:46
Strophorichthofenia Termier, Termier, Lapparent, and Marin, 1974:123]
Stroudithyris Buckman, 1915 [nomen nudum]; 1918:111'(<0*„(„(∞∞'åStruveina Boucot, 1975:364
Struvethyris Radulovic, 1991:27
Strygocephale Defrance, 1824 [nomen nudum]; 1825 [ICZN opinion 807 validated spelling as Stringocephalus]
Strygocephalus Keferstein, 1828 [misspelling of Strygocephale]
Stuartella Belanski, 1928:24 [=Hamburgia]
Sturtella Savage, 1971:417
Styriasis Rafinesque, 1831 [nomen nudum]
Styxorthis Mergl, 1991:7
Subansiria Sahni and Srivastava, 1956:212
Subcuspidella Mittmeyer, 1965:81
Subglobosochonetes Afanasjeva, 1976:67
Sublepida Mizens and Sapelnikov, 1982:16 [subgenus of Gracianella] 
Subquadriangulispirifer Sartenaer, 1982:153
Subrensselandia Cloud, 1942:92
Subriana Sapelnikov, 1960:111
Subsinucephalus Struve, 1992:584
Subspirifer Shan and Zhao, 1980 [nomen nudum]; 1981:49
Substriatifera Kotljar, 1964:123
Subtaeniothaerus Solomina, 1988:40
Subtransmena Struve, 1981 [=Minutostropheodonta]
Suessia Deslongchamps, 1855:539
Sufetirhyncha Havlicek, 1982:367
Suiaella Moisseiev, 1956, in Kiparisova et al., 1956:61
Sulaella Barchatova, 1970 [nomen nudum]
Sulcataria Cooper and Grant, 1969:5
Sulcathyris Durkoop, 1970:190
Sulcatina Schmidt, 1964:506
Sulcatinella Dagys, 1974:177
Sulcatorthis Zeng, 1987:216
Sulcatospira Xu, 1979:109 [subgenus of Zygospira]
Sulcatospirifer Maxwell, 1954:11
Sulcatostrophia Caster, 1939:81 [=Nervostrophia]
Sulcatothyris Dagys, 1974:176
Sulcicosta Waterhouse, 1983:156 
Sulcicostula Baranov, 1989:47
Sulciphoria Smirnova, 1992:23
Sulciplica Waterhouse, 1968:25
Sulciplicatatrypa Zhang Feng(c)ming, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:337 [subgenus of Spinatrypa]
Sulcirhynchia Burri, 1953:271
Sulcirostra Cooper and Muir(c)Wood, 1951:195 [new name for Rhynchonellopsis Gregorio, 1930]
Sulcirugaria Waterhouse, 1983:112
Sulcispiriferina Waterhouse and Gupta, 1981:390
Sulcorhynchia Dagys, 1974:103
Sulcupentamerus Zeng, 1987:240 [subgenus of Pentamerus]
Sulevorthis Jaanusson and Bassett, 1993:37
Sunacosarina Liang, 1990:356
Supertrilobus Boucot, 1975 [nomen nudum; =Supertrilobus Boucot and Johnson, 1979]
Supertrilobus Boucot and Johnson, 1979:100 [subgenus of Pentamerus]
Surugathyris Yabe and Hatai, 1934:588
Svalbardia Barchatova, 1970 [nomen nudum]; Afanasjeva, 1977:26
Svalbardoproductus Ustritsky, 1962:82
Svaljavithyris Tchorszhewsky, 1974:55
Svetlania Baranov, 1982:48 
Svobodaina Havlicek, 1950:38
Svobodiana Alichova, 1960 [misspelling of Svobodaina]
Swaicoelia Hamada, 1968:6
Swantonia Walcott, 1905:296
Symmatrypa Mizens and Sapelnikov, 1975:43
Symphythyris Smirnova, 1966:37
Synatrypa Copper, 1966:10 [subgenus of Desquamatia]
Syndielasma Cooper, 1956:743
Syntomaria Cooper, 1982:20 
Syntophopsis Ulrich and Cooper, 1936:630
Syntrielasma Meek and Worthen, 1866 [misspelling of Syntrilasma]
Syntrilasma Meek and Worthen, 1865, in Meek, 1865:277 [=Enteletes]
Syntrophia Hall and Clarke, 1892 [nomen nudum]; 1893:216
Syntrophina Ulrich, 1928, in Weller and St. Clair, 1928:74
Syntrophinella Ulrich and Cooper, 1934, in Kobayashi, 1934:164
Syntrophioides Schuchert and Cooper, 1931:247
Syntrophodonta Struve, 1982:198
Sypharatrypa Copper, 1982:690
Syphonotreta Rouiller and Vossinsky, 1847 [misspelling of Siphonotreta]
Syringopleura Schuchert, 1910:224 [=Syringothyris]
Syringospira Kindle, 1909:29
Syringothyris Winchell, 1863:7
Systenothyris Cooper, 1983:156
Szajnochiella Tchorszhewsky, 1973 [nomen nudum]
Tabarhynchus Baranov, 1989:45'(=0*„(„(∞∞'åTabellina Waterhouse, 1986:4
Tacinia Glushenko, 1975:116
Tadschikia Nikiforova, 1937:35
Taemostrophia Chatterton, 1973:43
Taeniothaerus Whitehouse, 1928:281
Taffia Ulrich, 1926, in Butts, 1926:100
Tafilaltia Havlicek, 1970:17
Taimyrella Ustritsky, 1963, in Ustritsky and Tschernjak, 1963:115
Taimyropsis Ustritsky, 1963, in Ustritsky and Tschernjak, 1963:69
Taimyrothyris Dagys, 1968:118
Taimyrrhynx Havlicek, 1983:154
Tainotoechia Tcherkesova, 1967:5
Tainuirhynchia MacFarlan, 1992:233
Talasoproductus Litvinovich and Vorontsova, 1983:92
Talentella Johnson, 1990:489
Taleoleptaena Havlicek, 1967:121
Tallinnites Roomusoks, 1993:50
Talovia Severgina, 1975:62 
Talovkorhynchia Smirnova, 1994:31
Tamarella Owen, 1965:57
Tanakura Hatai, 1936:322
Tanerhynchia Allan, 1947:442
Tanggularella Shi, 1990:308
Tangkouella Grabau, 1931 [nomen nudum]
Tangshanella Chao, 1929:57
Tangxiangia Xu, 1977:68
Tannuspirifer Ivanova, 1960:267
Tanyoscapha Cooper, 1983:241
Tanyothyris Cooper, 1989:94
Taoqupospira Fu, 1982:159
Tapajotia Dresser, 1954:33
Taphrodonta Cooper, 1956:740
Taphrorthis Cooper, 1956:326
Taphrosestria Cooper and Grant, 1975:954
Tarandrospirifer Simakov, 1970:88
Tarfaya Havlicek, 1971:32
Tarutiglossa Havlicek, 1984:63
Tashanomena Zhan and Rong, 1994:418
Tasmanella Laurie, 1991:96
Tasmanorthis Laurie, 1991:41
Tastaria Havlicek, 1965:6
Tatjanaspirifer Tcherkesova, 1991:91
Tatjania Baranov, 1982:47
Tauromenia Seguenza, 1885:253
Taurothyris Kyansep, 1961:27
Tautosia Cooper and Grant, 1969:14
Tazzarinia Havlicek, 1971:39
Tchadania Kulkov, 1985, in Kulkov, Vladimirskaya, and Rybkina, 1985:85
Tcharella Andreeva, 1987:38
Tchegemithyris Tchorszhewsky, 1972:38
Tcherskidium NIkolayev and Sapelnikov, 1969:12
Tectarea Licharew, 1928:268
Tectatrypa Mizens, 1973:44
Tectorthis Maillieux, 1940 [nomen nudum]
Tegulella Holmer, 1989:167 
Tegulifera Schellwien, 1898 [replaced by Teguliferina]
Teguliferina Schuchert and LeVene, 1929:121 [new name for Tegulifera]
Tegulithyris Buckman, 1915 [nomen nudum]; 1918:123
Tegulocrea Carter, 1992:331
Tegulorhynchia Chapman and Crespin, 1923:175
Teichertina Veevers, 1959:37
Teichostrophia Harper, Johnson, and Boucot, 1967:420
Telaeoshaleria Williams, 1950:281 [subgenus of Shaleria]
Teleoproductus Li, in Li, Yang, and Feng, 1986:230
Telothyris Almeras and Moulan, 1982:136
Templeella Rozman and Rong, 1993:37
Tenellodermis Havlicek, 1971:11
Teneobolus Mergl, 1995:104
Tenerella Liang, 1990:374
Tenisia Martynova, 1970:68
Tenocyrtina Johnson and Norris, 1972:566
Tenticospirifer Tien, 1938:113
Tenuiatrypa Rzonsnitzkaja, 1975:91
Tenuichonetes Jing and Hu, 1978:109
Tenuicostella Mittmeyer and Geib, 1967:40
Tenuisinurostrum Sartenaer, 1967:2
Teratelasma Cooper, 1956:823
Teratelasmella Laurie, 1991:84'(>0*„(„(∞∞'åTerazkia Havlicek, 1990, in Havlicek and Storch, 1990:94
Terebratalia Beecher, 1893:382
Terebrataliopsis Smirnova, 1962:98
Terebratella Orbigny, 1847:269
Terebratula Muller, 1776:249
Terebratularius Dumeril, 1806 [vernacular; =Terebratularius]
Terebratulina Orbigny, 1847:268
Terebratulites Martini, 1769 [nomen nudum]
Terebratuloidea Waagen, 1883:415
Terebratulopsis Gregorio, 1930:8 [=Rhynchonellina]
Terebrirostra Orbigny, 1847:269
Terrakea Booker, 1930:66
Tesuquea Sutherland and Harlow, 1973:53
Tethorotes Manankov, 1979:50
Tethyrete Havlicek, 1994:63
Tethyrhynchia Logan, in Logan and Zibrowius, 1994:79
Tethyspira Siblik, 1991:167
Tetjuchithyris Smirnova, 1984 [nomen nudum]; Smirnova, 1986, in Smirnova and Konovalov, 1986:81
Tetracamera Weller, 1910:503
Tetractinella Bittner, 1890:300
Tetragonetes Cooper and Grant, 1975:1246 [subgenus of Dyoros]
Tetralobula Ulrich and Cooper, 1936:628
Tetraodontella Jaanusson, 1962:1
Tetraphalerella Wang, 1949:29
Tetrarhynchia Buckman, 1914 [nomen nudum]; 1918:41
Tetratomia Schmidt, 1941:13
Texarina Cooper and Grant, 1970:579 [new name for Texasia]
Texasia Cooper and Grant, 1969 [replaced by Texarina]
Texathyris Carter, 1972:730
Thadiqithyris Nazer, 1987, in Almeras, 1987:189
Thaerodonta Wang, 1949:19 [=Eoplectodonta]
Thamnosia Cooper and Grant, 1969:10
Thaumatosia Cooper, 1973:15
Thaumatrophia Wang, 1955:343
Thebesia Amsden, 1974:69
Thecedea Orbigny, 1847 [misspelling of Thecidea]
Thecidaea Keferstein, 1828 [misspelling of Thecidea]
Thecidea Defrance, 1822, in Ferussac, 1822:xxxviii
Thecidella Munier(c)Chalmas, 1887, in Fischer, 1887:1331
Thecidellella Hayasaka, 1938:10 [=Thecidellina]
Thecidellina Thomson, 1915:462
Thecideum Fischer de Waldheim, 1834 [misspelling of Thecidium]
Thecidiopsis Munier(c)Chalmas, 1887, in Fischer, 1887:1330
Thecidium Sowerby, 1823 [misspelling of Thecidea]
Thecocyrtella Bittner, 1892:15 [new name for Cyrtotheca]
Thecocyrtelloidea Yang and Xu, 1966:58
Thecospira Zugmayer, 1880:152
Thecospirella Bittner, 1900:46
Thecospiropsis Dagys, 1974:75
Thedusia Cooper and Grant, 1976:2807
Theodossia Nalivkin, 1925:282
Thiemella Williams, 1908:60
Thliborhynchia Lenz, 1967:1188
Thomasaria Stainbrook, 1945:57
Thomasella Paul, 1942 [invalid new name for Thomasina Paeckelmann, 1931, Thomasella preoccupied; replaced by Argentiproductus]
Thomasella Fredericks, 1928:778
Thomasia Fredericks, 1928 [replacement by Thomasina Paeckelmann, invalid, preoccupied; replacement by Thomasella Paul, invalid, preoccupied; replaced by Argentiproductus]
Thomasina Paeckelmann, 1931 [invalid new name for Thomasia Fredericks, preoccupied; replacement by Thomasella Paul, invalid, preoccupied; replaced by Argenitproductus]
Thomasina Bigot, 1927 [misspelling of Tomasina]
Thomsonia Jackson, 1916 [replaced by Cacata and Coptothyris]
Thomsonica Cossman, 1920 [invalid new name for Aetheia, Aetheia not preoccupied]
Thuleproductus Sarytcheva and Waterhouse, 1972:67
Thurmannella Leidhold, 1921:357
Thyratryaria Xu and Liu, 1983:92 
Thysanobolus Havlicek, 1982:21
Thysanotos Mickwitz, 1896:130
Tianzhushanella Liu, 1979:509
Tiaretithyris Tchoumatchenco, 1986:114
Tibetatrypa Copper and Hou, 1986:287 
Tibetospirifer Liu and Wang, 1990:388
Tibetothyris Ching and Sun, 1976, in Ching et al., 1976:327
Tichirhynchus Baranov, 1989:42
Tichosina Cooper, 1977:62
Tienospirifer Li, 1982 [nomen nudum] 
Tilasia Holmer, 1991:197
Timalina Batrukova, 1969:70
Timaniella Barchatova, 1968, in Markowskii, 1968:162
Timanospirifer Ljaschenko, 1973:92'(?0*„(„(∞∞'åTimorhynchia Ager, 1968:58
Timorina Stehli, 1961:465
Tingella Grabau, 1931:407 [=Reticulariopsis]
Tiocyrspis Sartenaer, 1994:32
Tipispirifer Grant, 1976:213
Tiramnia Grunt, 1977:64
Tisimania Hatai, 1938:97 [subgenus of Diestothyris]
Tissintia Havlicek, 1970:14
Titanambonites Cooper, 1956:717
Titanaria Muir(c)Wood and Cooper, 1960:334
Titanomena Bergstrom, 1968:16
Titanothyris Ching and Hu, 1982, in Wang Guo(c)ping et al., 1982:253; Jin, 1983:233 
Tityrophoria Waterhouse, 1971, in Bamber and Waterhouse, 1971:214
Tivertonia Archbold, 1983:71
Tobejalotreta Koneva, Popov, and Ushatinskaia, 1990, in Koneva, Popov, Ushatinskaia, and Esakova, 1990:163
Togaella Severgina, 1960, in Khalfin, 1960:409
Togatrypa Havlicek, 1987:76
Tolmatchoffia Fredericks, 1933:29
Tomasina Hall and Clarke, 1892:65
Tomestenoporhynchus Sartenaer, 1993:13
Tomheganella Boucot, 1975 [nomen nudum]
Tomilia Sarytcheva, 1963, in Sarytcheva et al., 1963:220
Tomiopsis Benediktova, 1956:169
Tomiproductus Sarytcheva, 1963, in Sarytcheva et al., 1963:201
Tonasirhynchia Lobatscheva and Smirnova, 1994:131
Tongluella Liang, 1990:203
Tongzithyris Jin, Liao, and Fang, 1974:313
Tonsella Amsden, 1988, in Amsden and Barrick, 1988:21
Toquimaella Johnson, 1967:876
Toquimia Ulrich and Cooper, 1936:626
Tornquistia Paeckelmann, 1930:218
Torosospirifer Gourvennec, 1989:158 [subgenus of Brachyspirifer]
Torquirhynchia Childs, 1969:95
Torynechus Cooper and Grant, 1962:1128 [new name for Uncinuloides]
Torynelasma Cooper, 1956:257
Torynifer Hall and Clarke, 1893, pl.84
Toryniferella Weyer, 1967:435
Tosuhuthyris Sun and Ye, 1982:166
Totia Rzonsnitzkaja and Mizens, 1977:92
Tourmakeadia Williams and Curry, 1985:252
Toxonelasma Cooper, 1989:95
Toxorthis Temple, 1968:20
Transennatia Waterhouse, 1975:10
Transversaria Waterhouse and Gupta, 1983:240
Trasgu Martinez, 1979:251
Trautscholdia Ustritsky, 1967:37
Treioria Neuman and Bates, 1978:584
Trematis Sharpe, 1848:68
Trematobolos Easton, 1960 [misspelling of Trematobolus]
Trematobolus Matthew, 1893:276
Trematorthis Ulrich and Cooper, 1938:112
Trematosia Cooper, 1976:276
Trematospira Hall, 1859:207
Tremorthis Ulrich and Cooper, 1938 [printer's error for Trematorthis]
Treptotreta Henderson and MacKinnon, 1981:293
Tretorhynchia Brunton, 1971:98
Triadispira Dagys, 1961:457
Triadithyris Dagys, 1963:187
Triangope Dieni and Middlemiss, 1981:39
Triasorhynchia Xu and Liu, 1983:90
Triathyris Comte, 1938:45
Trichochonetes Roberts, 1976:22
Trichorhynchia Buckman, 1914 [nomen nudum]; 1918:58
Trichothyris Buckman, 1915 [nomen nudum]; 1918:125
Tricoria Cooper and Grant, 1976:1945
Tridensilis Su, 1976:193
Trifidarcula Elliott, 1959:147
Trifidorostellum Sartenaer, 1961:5
Trigeria Bayle, 1878, pl.13 [=Retzia]
Trigonatrypa Havlicek, 1990, in Havlicek and Kukal, 1990:154
Trigonella Quenstedt, 1868 [replaced by Neotrigonella]
Trigonellina Buckman, 1907:342
Trigonirhynchella Dagys, 1963:41 [new name for Trigonirhynchia Dagys, 1961]
Trigonirhynchia Cooper, 1942:228 [new name for Uncinulina]
Trigonirhynchioides Fu, 1982:144 
Trigonithyris Muir(c)Wood, 1935:131
Trigonoglossa Dunbar and Condra, 1932:35
Trigonosemus Koenig, 1825:3'(@0*„(„(∞∞'åTrigonospirifer Wang, Rong and Chen, 1987:132
Trigonotreta Koenig, 1825:3
Trigonotrophia Andreeva, 1972:54 [subgenus of Idiostrophia]
Trigorima Rafinesque, 1819; 1831 [nomina nuda]
Trigrammaria Wilson, 1945:140
Trilobatoechia Xian, 1990:44
Trilobostrophia Schischkina, 1983:1229
Trimerella Billings, 1862:166 [replacement by Gotlandia Dall, 1870, later withdrawn by Dall]
Trimurellina Mitchell, 1977:74
Triplecella Wilson, 1932:400 [=Cyclospira]
Triplecia Oehlert, 1887; Hall and Clarke, 1892 [incorrect emendation of Triplesia]
Triplesia Hall, 1859:44
Triseptalia Makridin, 1954 [nomen nudum]
Triseptata Bondarev, 1965, in Bondarev et al., 1965:34
Triseptothyris Xu, 1978:314
Tritoechia Ulrich and Cooper, 1936:625
Trochalocyrtina Wright, 1975:175
Trochifera Ching and Ye, 1979, in Ye and Yang, 1979:68
Trondorthis Neuman, 1974, in Neuman and Bruton, 1974:77
Tropeothyris Smirnova, 1972:69
Trophisina Cooper and Grant, 1976:2078
Tropidelasma Cooper and Grant, 1969:3
Tropidoglossa Rowell, 1966:31
Tropidoleptus Hall, 1857:151
Tropidothyris Cooper, 1956:507
Tropiorhynchia Buckman, 1914 [nomen nudum]; 1918:33 [=Piarorhynchia]
Trotlandella Neuman, 1974, in Neuman and Bruton, 1974:95
Trucizetina Havlicek, 1974:169
Truncalosia Imbrie, 1959:401
Truncatenia Liao, 1980:32 [Liao in 1982:539 corrected spelling of Tuncatinia Liao, 1980b]
Trunculites Rafinesque, 1831 [nomen nudum]
Tsaganella Oleneva, 1993:50
Tschatkalia Nikiforova, 1964:85
Tschernovia Kalashnikov, 1993:37
Tschernyschewia Stoyanow, 1910:855
Tschernyschewiella Fredericks, 1924 [replaced by Kochiproductus]
Tshemsarythyris Ovtsharenko, 1983:38
Tubaria Muir(c)Wood and Cooper, 1960:236
Tubegatanella Prosorovskaja, 1968:244
Tuberculatella Waterhouse, 1982:42
Tuberculatospira Xian, 1988, in Hou, 1988:223
Tuberella Vogel, Xu and Langenstrassen, 1989:36 [pre(c)occupied by Tuberella Lee, 1986]
Tuberella Lee, in Lee, Yang, and Feng, 1986:222
Tubersulculus Waterhouse, 1971, in Bamber and Waterhouse, 1971:208
Tubithyris Buckman, 1915 [nomen nudum]; 1918:115
Tubulostrophia Havlicek, 1967:139
Tudiaophomena Xian, 1978:266
Tufoleptina Havlicek, 1961:447 [=Leangella per written comm. of Havlicek]
Tulathyris Grunt, 1976:78
Tulcumbella Campbell, 1963, in Campbell and Engel, 1963:68
Tulipina Smirnova, 1962:102
Tuloja Severgina, 1983, in Rozman and Severgina, 1983:24 
Tulungospirifer Ching and Sun, 1976, in Ching et al., 1976:316
Tumarinia Solomina and Grigorjewa, 1973, in Grigorjewa and Solomina, 1973:35
Tunaria Hoek, 1912 [replaced by Tunarites]
Tunarites Cooper and Muir(c)Wood, 1951:196 [new name for Tunaria; =Bistramia]
Tuncatinia Liao, 1980:32 [misspelling of Truncatenia Liao, 1982]
Tunethyris Calzada, 1994, in Calzada, Peybernes, Kamoun and Youssef, 1994:118
Tungussotoechia Lopushinskaja, 1976:60 [subgenus of Stegerhynchus]
Tunisiglossa Massa, Havlicek, and Bonnefous, 1977:13
Tuotalania Hu, 1983:105
Turarella Andreeva, 1987:34
Turgenostrophia Alekseeva, 1983, in Alekseeva and Erlanger, 1983:29
Turkmenithyris Prosorovskaja, 1962:109
Turriculum Gregorio, 1930:26
Tuvaechonetes Kulkov, 1984:1125; 1985, in Kulkov, Vladimirskaya, and Rybkina, 1985:114
Tuvaella Tschernyschew, 1937:11
Tuvaerhynchus Kulkov, 1985, in Kulkov, Vladimirskaya, and Rybkina, 1985:123
Tuvaestrophia Kulkov, 1985, in Kulkov, Vladimirskaya, and Rybkina, 1985:100
Tuvinia Andreeva, 1982:56
Twenhofelia Boucot and Smith, 1978:272
Tyersella Philip, 1962:197
Tylambonites Percival, 1991:143
Tyloplecta Muir(c)Wood and Cooper, 1960:291
Tylospiriferina Xu, 1978:297
Tylothyris North, 1920:197
Tylotoma Grabau, 1934 [=Spiriferellina]
Tyrganiella Kulkov, 1970, in Alekseeva et al., 1970:167'(A0*„(„(∞∞'åTyronella Mitchell, 1977:64
Tyrothyris Opik, 1953:15 [=Meifodia]
Tyryrhynchus Baranov, 1988:39
Tythothyris Zezina, 1979:224
Uchtella Ljaschenko, 1973:50
Uchtospirifer Ljaschenko, 1957:885 [=Cyrtiopsis]
Uexothyris Struve, 1992:572
Ufonicoelia Havlicek, 1992:112
Ujandinella Baranov, 1977:75
Ujukella Andreev, 1993:52
Ujukites Andreeva, 1985:41 
Ukoa Opik, 1932:33
Ulbospirifer Gretchischnikova, 1965:33
Uldziathyris Grunt, 1977:82
Umboanctus Waterhouse, 1971, in Bamber and Waterhouse, 1971:212
Uncina Kaplun, 1991, in Kaplun and Krupchenko, 1991:125
Uncinella Waagen, 1883:494
Uncinulina Bayle, 1878 [replaced by Trigonirhynchia Cooper, 1942]
Uncinuloides King, 1931 [replaced by Torynechus]
Uncinulus Bayle, 1878, pl.11
Uncinunellina Grabau, 1932:100
Uncisteges Jing and Hu, 1978:117
Uncites Defrance, 1825, in Blainville, 1825:630
Uncitispira Fu, 1982:150
Undaria Muir(c)Wood and Cooper, 1960:318
Undatrypa Copper, 1978:302 [subgenus of Punctatrypa]
Undellaria Cooper and Grant, 1975:1158
Undiferina Cooper, 1956:262
Undispirifer Havlicek, 1957:439
Undispiriferoides Xian, 1978:330
Undithyrella Havlicek, 1971:78
Undulella Cooper and Grant, 1969:5
Undulorhyncha Amsden, 1988, in Amsden and Barrick, 1988:21
Ungula Pander, 1830:59 [=Obolus]
Ungulites Bronn, 1848 [misspelling of Ungula]
Uniplicatorhynchia Sun and Ye, 1982:158
Unispirifer Campbell, 1957:67
Uralella Makridin, 1960, in Licharew et al., 1960:295
Uralia Licharew, 1925 [replaced by Uralina]
Uralina Schuchert and LeVene, 1929:122 [new name for Uralia; =Eolyttonia]
Uraloconchus Lazarev, 1990:112
Uraloproductus Ustritsky, 1971:21
Uralorhynchia Dagys, 1968:54
Uralospira Mizens, 1977:82
Uralospirifer Havlicek, 1959:246
Uralotoechia Sapelnikov, 1963:17
Urbanirhynchia Katz, 1974:252
Urbimena Havlicek, 1976:367
Urekchania Simakov, 1984 [nomen nudum]
Urella Rzonsnitzkaja, 1960, in Markowskii, 1960:403
Urticites Defrance, 1828 [=Hysterolites]
Urushtenia Licharew, 1935:370
Urushtenoidea Jing and Hu, 1978:116
Ushkolia Martynova and Sverbilova, 1969:96
Usinia Aksarina, 1992:76
Ussovia Khalfin, 1955 [=Wilsoniella]
Ussunia Nikitin and Popov, 1984, in Klenina, Nikitin, and Popov, 1984:127
Ussuricamara Koczyrkevicz, 1969:11
Ussurichonetes Licharew and Kotljar, 1978:96 [nomen nudum]
Ussurirhynchia Koczyrkevicz, 1976:80
Vaculina Koneva, 1992:90
Vadimia Boucot and Rong, 1994:407
Vadum Strusz, 1982:136
Vaga Sapelnikov and Rukavischnikova, 1973:33
Vagranella Sapelnikov, 1960:116 [subgenus of Subriana]
Vagrania Alekseeva, 1959:389
Valcourea Raymond, 1911:240
Valdaria Bassett and Cocks, 1974:18
Valdiviathyris Helmcke, 1940:237
Validospirifer Simakov, 1984 [nomen nudum] 
Vallomyonia Johnson, 1966:158
Vandalotreta Mergl, 1988:292
Vandercammenina Boucot, 1975:363
Vandergrachtella Crickmay, 1953:7 [=Theodossia]
Vandobiella Pojariskaja, 1966:22
Vaniella Kvakhadze, 1974:493
Variatrypa Copper, 1966:12 [subgenus of Desquamatia]
Vassilkovia Popov and Khazanovitch, 1989:123'(B0*„(„(∞∞'åVectella Owen, 1965:51
Vediproductus Sarytcheva, 1965, in Ruzhentsev and Sarytcheva, 1965:219
Veeversalosia Lazarev, 1989:39
Veghirhynchia Dagys, 1974:84
Vehnia Neuman, 1989:65
Velciella Havlicek, and Snajdr, 1952 [nomen nudum]
Veliseptum Popov, 1976, in Nazarov and Popov, 1976:38
Vellamo Opik, 1930:212
Velostrophia Havlicek, 1965:7
Venezuelia Weisbord, 1926:22
Verchojania Abramov, 1970:112
Verkhotomia Sokolskaja, 1963, in Sarytcheva et al., 1963:280 [=Pseudosyrinx]
Vermiculothecidea Elliott, 1953:694
Verneuilia Hall and Clarke, 1893:57
Vex Hoover, 1979:9
Viallithyris Voros, 1978:62
Viarhynchia Calzada Badia, 1974:170
Victorithyris Allan, 1940:289
Viligella Dagys, 1965:116
Viligothyris Dagys, 1968:89
Viljandia Popov and Nylvak, 1982 [nomen nudum] 
Villicundella Levy and Nullo, 1974:178
Vincalaria Sartenaer 1989:61
Vincentirhynchia MacFarlan, 1992:145
Vincia Gregorio, 1930:31 [subgenus of Lyttonia; =Leptodus]
Virbium Gregorio, 1930:25
Virgiana Twenhofel, 1914:27
Virgianella Nikiforova and Sapelnikov, 1971:49
Virginiata Amsden, 1968:56
Virgoria Neuman, 1977:23
Viruella Roomusoks, 1959:14 [subgenus of Sowerbyella]
Visbyella Walmsley, Boucot, Harper, and Savage, 1968:306
Vitiliproductus Ching and Liao, 1974:278
Vitimetula Hoover, 1991:86
Vitulina Hall, 1860 [nomen nudum]; 1867 [replacement by Pustulina invalid, Pustulina preoccupied, replaced by Pustulatia]
Vjalovithyris Tchorszhewsky, 1989:33 
Vladimirella Popov, 1994:106 [new name for Nalivkinella, Popov, 1974(c) pre(c)occupied]
Vladimirirhynchus Baranov, 1982:44
Vltavothyris Havlicek, 1956:621 [=Meganteris]
Voiseyella Roberts, 1964:187
Volborthia Moller, 1870:409
Volgathyris Smirnova, 1987:38
Volgospirifer Schevtchenko, 1970:111 
Volirhynchia Dagys, 1974:104
Voskopitoechia Havlicek, 1992:105
Vosmiverstum Breivel and Breivel, 1970:54
Waagenia Hall, 1889 [nomen nudum; =Polytoechia]
Waagenites Paeckelmann, 1930:223
Waagenoconcha Chao, 1927:85
Waagenopora Noetling, 1902 [invalid new name for Oldhamina]
Waconella Owen, 1970:74
Wadiglossa Havlicek, 1984:63
Waikatorhynchia MacFarlan, 1992:243
Waiparia Thomson, 1920:380
Wairakiella Waterhouse, 1967:87
Wairakirhynchia MacFarlan, 1992:55
Waisiuthyrina Beets, 1943:342
Walcottina Cobbold, 1921:336
Waldheimia King, 1850 [replaced by Magellania]
Waldheimiathyris Helmcke, 1939 [invalid new name for Macandrevia, Macandrevia not preoccupied]
Walkeria Haas, 1890 [nomen nudum]
Walkerithyris Cox and Middlemiss, 1978:424
Waltonia Davidson, 1850:475
Wardakia Termier, Termier, Lapparent, and Marin, 1974:94
Warrenella Crickmay, 1953:596
Warrenellina Brice, 1982:103 [subgenus of Warrenella]
Warsawia Carter, 1974:684
Waterhouseiella Archbold, 1983:70
Wattonithyris Muir(c)Wood, 1936:91
Wattsella Bancroft, 1928:55 [=Dalmanella]
Webbyspira Percival, 1991:163
Weberithyris Smirnova, 1969:144
Weibeia Fu, 1980:3; 1982:171
Weiningia Ching and Liao, 1974:282
Weizhouella Chen, 1983:322 
Weldonithyris Muir(c)Wood, 1952:130
Wellerella Dunbar and Condra, 1932:287
Wellerellina Shen, He & Zhu, 1992:183'(C0*„(„(∞∞'åWelleria Maillieux, 1931 [invalid new name for Delthyris in sensu Weller, 1914 [not Delthyris Dalman, 1828), Welleria preoccupied and nomen nudum; =Tylothyris]
Welleria Rotai, 1938 [nomen nudum]; 1941 [replaced by Rotaia]
Wenxianirhynchus Zhang, 1983, in Zhang, Fu and Ding, 1983:316
Werneckeella Lenz, 1971:844
Werriea Campbell, 1957:44 [=Orthotetes]
Westbroekina Savage and Baxter, 1995:1037
Westonia Walcott, 1901:683
Westonisca Havlicek, 1982:28
Westralicrania Cockbain, 1967:119
Whidbornella Reed, 1943:71
Whitfieldella Hall and Clarke, 1893:58
Whitfieldia Davidson, 1882:107 [=Meristina]
Whitspakia Stehli, 1964:610 [new name for Pakistania]
Whittardia Williams, 1974:62
Wilberrya Yancey, 1978:301
Wilsonella Nikiforova, 1937 [invalid new name for Wilsonia, Wilsonella preoccupied; replaced by Sphaerirhynchia]
Wilsonia Kayser, 1871 [replacement by Wilsonella invalid, Wilsonella preoccupied; replaced by Sphaerirhynchia]
Wilsoniella Khalfin, 1939:83
Wimanella Walcott, 1908:99
Wimanoconcha Waterhouse, 1983:125
Winterfeldia Spriestersbach, 1942:198 [=Uncites]
Wiradjuriella Percival, 1991:138
Wittenburgella Dagys, 1959:30
Worobievella Dagys, 1959:33
Worthenella Girty, 1938 [replaced by Labriproductus]
Wulongella Zhu, 1985:36
Wulungguia Zhang Chuan, 1981, in Zhang and Zhang, 1981:92
Wutubulakia Hou and Zhang Feng(c)ming, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:338
Wyatkina Fredericks, 1931:211
Wyella Khodalevich, 1939:21
Wyndhamia Booker, 1930:25
Wynnia Walcott, 1908 [nomen nudum]; 1912:771
Wysogorskiella Hints, 1975:61
X Pajaud, 1966 [un(c)named; =Konstantia]
Xana Garcia(c)Alcalde, 1972:5
Xenambonites Cooper, 1956:814
Xenelasma Ulrich and Cooper, 1936:631
Xenelasmella Rozman, 1964, in Chugaeva et al., 1964:137
Xenelasmopsis Rozman, 1968:56
Xeniopugnax Havlicek, 1982:111
Xenizostrophia Su, 1976:181
Xenobrochus Cooper, 1981:19
Xenocryptonella Zhang, 1983, in Zhang, Fu and Ding, 1983:424
Xenomartinia Havlicek, 1953:6
Xenorina Cooper, 1989:115
Xenorthis Ulrich and Cooper, 1936:620
Xenosaria Cooper and Grant, 1976:2171
Xenospirifer Hou and Xian, 1975:69
Xenosteges Muir(c)Wood and Cooper, 1960:111
Xenostrophia Wang, 1974, in Wang et al., 1974:38
Xenothyris Ching, Rong, and Sun, 1976, in Ching et al., 1976:337
Xerospirifer Havlicek, 1978:103
Xerxespirifer Cocks, 1979:40
Xestosia Cooper and Grant, 1975:1063
Xestosina Cooper, 1983:166 
Xestotrema Cooper and Grant, 1969:16
Xianfengella He and Yang, 1982 [nomen nudum(c) no type designated!]
Xiangzhounia Ni and Yang, 1977:464
Xiaobangdaia Wang, 1985, in Jin, Wang, Sun, and Shi, 1985:200
Xinanorthis Xu, Rong, and Liu, 1974:145
Xinanospirifer Rong, Xu, and Yang, 1974:206
Xinjiangiproductus Yao and Fu, 1987:96
Xinjiangochonetes Xu, 1991:317
Xinjiangospirifer Hou and Zhang Feng(c)ming, 1983, in Zhang, Zhang, Zhang, and Wang, 1983:362 
Xinjiangthyris Sun, 1984, in Sun and Wang, 1984:95
Xinshaoella Zhao, 1977:391
Xinshaoproductus Tan, 1986:433
Xizangostrophia Rong, 1976, in Liu, 1976:150
Xizispirifer Liang, 1990:323
Xysila Copper, 1995:848
Xystostrophia Havlicek, 1965:292
Yabeithyris Hatai, 1948:498
Yagonia Roberts, 1976, in Roberts et al., 1976:210
Yakovlevia Fredericks, 1925:7
Yakutijaella Baranov, 1977:77
Yalongia Xu and Liu, 1983:112
Yanbianella Tong, 1978:239
Yanetechia Baranov, 1980:85'(D0*„(„(∞∞'åYangkongia Xu and Liu, 1979 [nomen nudum]
Yangkongia Xu and Liu, 1983:115
Yangtzeella Kolarova, 1925:219
Yanguania Yang, 1977:346; 1978:107; 1978:249
Yanishewskiella Licharew, 1957:138
Yanospira Dagys, 1977:11
Yaonoiella Waterhouse, 1983:143 
Yarirhynchia Ching and Sun, 1979 [nomen nudum]
Yarirhynchia Jing and Sun, 1981:147
Yatsengina Semichatova, 1936:216 [=Choristites]
Yavorskiella Lazutkin, 1940 [nomen nudum; =Lazutkinia]
Yekerpene Struve, 1992:614
Yeosinella Reed, 1933:193
Yeothyris Struve, 1992:582
Ygera Havlicek, 1961:449 [=Plectodontella]
Ygerodiscus Havlicek, 1967:62
Yichangorthis Zeng, 1987:214
Yidunella Ching, Sun, and Ye, 1979:148
Yidurella Zeng, 1987:210
Yingtangella Bai and Ying, 1977 [nomen nudum]; 1978 in Yoh and Bai, 1978:54
Yingwuspirifer Rong, Xu, and Yang, 1974:201
Yochelsonia Stehli, 1961:454
Yongjia Liu, 1977, in Liu and Huang, 1977:60
Yorkia Walcott, 1897:714
Ypsilorhynchus Sartenaer, 1970:9
Yrctospirifer Gatinaud, 1949:488 [=Cyrtospirifer]
Yuanbaella Fu, 1982:116
Yuezhuella Ching and Ye, 1979, in Ye and Yang, 1979:69
Yukiangides Havlicek, 1992:61
Yulongella Sun, 1981:191
Yunnanella Grabau, 1923:195
Yunnanella Grabau, 1931 [replaced by Nayunnella]
Yunnanellina Grabau, 1931 [=Yunnanella Grabau, 1923]
Yunnanoleptaena Jahnke and Shi, 1989:153
Yunshannella Lee and Gu, 1982:54 
Zaissania Sokolskaja, 1968, in Sarytcheva, 1968:197
Zanclorhyncha Xu, 1979:96
Zdimir Barrande, 1881:171
Zdimirella Tcherkesova, 1973:32
Zeilleria Bayle, 1878, pl.9
Zeillerina Kyansep, 1959:119
Zejszneria Siemiradzki, 1922:172
Zellania Moore, 1855:111
Zeravshania Menakova, 1983:67
Zeravshanotoechia Rzonsnitzkaja, 1977:127
Zeugopleura Carter, 1988:71
Zeuschneria Smirnova, 1975:137
Zhanatella Koneva, 1986:50
Zhejiangella Liang, 1982, in Wang Guo(c)ping et al., 1982:236
Zhejiangellina Liang, 1990:258
Zhejiangoproductus Liang, 1990:196
Zhejiangorthis Liang, 1983, in Liu, Xu, and Liang, 1983:269
Zhejiangospirifer Liang, 1982, in Wang Guo(c)ping et al., 1982:243
Zhenania Ding, 1983, in Zhang, Fu and Ding, 1983:293 
Zhexichonetes Liang, 1982, in Wang Guo(c)ping et al., 1982:201
Zhidothyris Ching, Sun, and Ye, 1979:216
Zhinania Liang, 1990:309
Zhonghuacoelia Chen, 1978:361
Zhongliangshania Shen, He and Zhu, 1992:191
Zhongpingia Yang, 1980 [nomen nudum]; 1983:35
Zhuaconcha Liang, 1990:184
Zia Sutherland and Harlow, 1973:59
Ziganella Nalivkin, 1960, in Ivanova, 1960:280
Zigania Nalivkin, 1937 [nomen nudum; =Dzieduszyckia]
Zilimia Nalivkin, 1937 [nomen nudum]; 1947:98
Zittelina Rollier, 1919:368
Zlichopyramis Havlicek, 1975:233
Zlichorhynchus Havlicek, 1963:403
Zonarites Rafinesque, 1831? [incertae sedis]
Zonathyris Struve, 1992:563 [subgenus of Athyris]
Zophostrophia Veevers, 1959:63
Zugmayerella Dagys, 1963:99
Zugmayeria Waagen, 1882:334 [originally spelled Zugmeyeria by Waagen, corrected to Zugmayeria]
Zygatrypa Copper, 1977:307
Zygonaria Cooper, 1983:275 
Zygospira Hall, 1862:155
Zygospiraella Nikiforova, 1961, in Nikiforova and Andreeva, 1961:237