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OBOLIDAE

Sous-embranchement (subphylum) des Linguliformea
Classe des Lingulata
Ordre des Lingulida
Super-famille des Linguloidea

 
 

 
 

 
   Family OBOLIDAE King, 1846   

[Obolidae King, 1846, p. 28] [incl. Experilingulidae Ushatinskaya, 1992;Kyrshabaktellidae Holmer & Popov, herein, nom. correct. pro Kyrshabactellidae Ushatinskaya, 1992, p. 83]

Shell unequivalved or subequivalved, variable in outline; larval shell smooth; ventral pseudointerarea usually with deep pedicle groove; ventral propareas usually with well developed flexure lines; dorsal pseudointerarea variably developed; pedicle emerging between valves; muscle system with paired umbonal muscle a scars; dorsal visceral area b invariably with well-developed, tongue like, median, anterior projection; mantle canal system baculate with well-developed vascula media; ventral vascula lateralia usually divergent in posterior half or arcuate, converging anteriorly. c

Lower Cambrian (upper Atdabanian)–Lower Carboniferous.

Diagnosis from volume 2 of the Treatise on Invertebrate Paleontology

Comments according to Emig (2002, 2003, 2006):
a in Obolus this muscle is paired ventrally and unpaired dorsally;
a in Schmidtites the posterior adductor muscle is unpaired on both sides;
b in Obolus as in several other obolid genera, this feature is not a taxonomic one according to its large variability or lack;
c other characters should be added as for example : Bi-symmetrical muscle arrangement

 
   Subfamily OBOLINAE King, 1846   

[nom. transl. Dall, 1870, p. 154, ex Obolidae King, 1846, p. 28] [incl. Lingulellinae SCHUCHERT, 1893]

Shell rounded, elongate, suboval to subtriangular, unequivalved; ventral pseudointerarea well developed, raised or continuous with valve floor; dorsal pseudointerarea with median groove or undivided.

Lower Cambrian (upper Atdabanian)-Lower Carboniferous.

Diagnosis from volume 2 of the Treatise on Invertebrate Paleontology

NOTA : Toutes diagnoses indiquées ici portent mention de la source utilisée dont il est obligatoire de citer la référence pour tout usage.
For all the diagnoses indicated herein, the original reference is given and must be cited for any use.

  • Treatise on Invertebrate Paleontology (R. L. Kaesler, ed.), Part H. Brachiopoda. Geological Society of America and University of Kansas, Boulder, Colorado, and Lawrence, Kansas, vol. 2 (2000).

  • Emig C. C., 2002. Tools for linguloid taxonomy: the genus Obolus (Brachiopoda) as an example. Carnets de Géologie/Notebooks on Geology, Article 2002/01 (CG2002_A01_CCE)  &  [pdf]

  • Popov L.E. & Holmer L.E., 2003. Understanding linguloid brachiopods: Obolus and Ungula as examples. Carnets de Géologie/Notebooks on Geology, Article 2003/06 (CG2003_A06_LEP-LEH)  &  [pdf]

  • Emig C. C., 2003. Reply to L.E. Popov and L.E. Holmer (2003): Obolid taxonomy. Carnets de Géologie/Notebooks on Geology, Article 2003/06_Reply (CG2003_A06_Reply_CCE)  &  [pdf]

  • Emig C. C., 2006. Schmidtites celatus (Obolida, Brachiopoda) from the "Obolus sands" (Upper Cambrian - Lower Ordovician) of Estonia. Carnets de Géologie/Notebooks on Geology, Article 2006/04 (CG2006_A04)   &  [pdf].

     


  • Other Genera will be added in the future
     

     


    How Lingulid Brachiopods made the USSR yield!

    Comment les Brachiopodes Lingulides ont fait céder l'URSS !