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Zygonaria joloensis (Dall, 1920)
Type locality: Jolo Light, off Jolo, Philippines, at 582 m (st. 512: 06°03'15"N, 120°35'30"E)
Depth range: 192 - 582 m
Gryphus joloensis Dall, 1920
Original Diagnosis - Dall (1920, p. 313)
Shell rounded triangular, widest at the anterior third, smooth except for concentric lines of giowth, not folded; beak high, incurved and conspicuous with a large entire foramen, the deltidial plates small and narrow, coalescent; hinge margin thickened, longer than the short stout teeth, anterior margin smooth, muscular impressions obscure; brachial valve less inflated, dental plates wide, the sockets faintly cross striated, the loop short, rather wide, the lower portion with a median deep sulcus behind and a corresponding projection in front, the crura short and blunt; the plates are separated to the apex where there is a prominent callosity serving as cardinal process ; the front edge of the valves is nearly straight.
| This species is considered by Cooper (1983) as type species, but according to the ICZN priority the correct species should be T. davidsoni Adams.
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Zygonaria davidsoni (Adams, 1867)
Type locality: Satanomosaki, Japan, at 100 m.
Depth range: 101 - 188 m
Terebratula davidsoni Adams, 1867, p. 314.
Liothyris vitrea, var. davidsoni Adams: Davidson, 1886, p. 9, Pl. 1: 14-16.
Original Diagnosis - Adams (1867, p. 314)
T. testa ovato-globosa, lævi, albida, laminis incrementi distinctis, irregularibus, ad basin validioribus ; margine ventrali circulari ; rostro producto, recurvato ; foramine parvo, perfecto ; deltidio parvo, concavo ; apophysi simplici, 1/3 longitudinis testæ superante.
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