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Genus Tythothyris Zezina, 1979 |
[Type species= Tythothyris rosimarginata Zezina, 1979 (p. 224)] |
Small, smooth, biconvex, rectimarginate to weakly sulcate; similar to juvenile Diestothyris but crura and descending loop branches not developed; septal pillar with ventrally curved, ascending lamellae that do not unite, with small, posteriorly directed flanges at apices of ascending lamellae. |
Present Diagnosis from volume 5 of the Treatise on Invertebrate Paleontology (2006) |
Extant Species of Tythothyris |
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Diagnosis |
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Tythothyris rosimarginata Zezina, 1979 Type locality: Bering Island, depth 20 m [st. 184, sample 420] Tythothyris rosimarginata Zezina, 1979, p. 102 Diagnosis (Zezina, 1979) in Russian |
from Zezina (1979) |