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Siberionautilidae
Siberionautilidae is a family in the nautilid superfamily Clydonautilaceae that contains only the genus ''Siberionautilus'', which comes from the Upper Triassic (Carnian) of Siberia, Russia.
The family, and genus, are characterized by an involute, globular shell covered by fine radial ribs, with flattened flanks that converge toward a rounded venter, distinct umbilicus with rounded shoulders, differentiated suture, and central siphuncle. The suture is goniatitic with the ventral or median saddle of the Clydonautilidae, subdivided so as to have a deep finger-like median ventral lobe bracketed by finder-like secondary lobes and saddles, and on either side, a large claw-like asymmetric lateral lobe.
Like ''Gonionautilus'', ''Siberionautilus'' is derived from the Clydonautilidae, only the genus is unspecified. As with ''Gonionautilus'' and more advanced Clydonautilidae, ''Siberionautilus'' is one of a handful of nautilids that have goniatitic sutures as found in primitive ammonoids.
==''References''==
* Bernhard Kummel, 1964. Nautiloidea -Nautilida; Treatise on Invertebrate Paleontology, Part K. Geol Soc of America and Univ of Kansas press, R.C. Moore (ed)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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