Siberionautilidae

Siberionautilidae is a family in the nautilid superfamily Clydonautiloidea that contains only the genus Siberionautilus, which comes from the Upper Triassic (Carnian) of Siberia, Russia.

Siberionautilidae
Temporal range: U Triassic (Carn)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Nautilida
Superfamily: Clydonautiloidea
Family: Siberionautilidae
Popov, 1951

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

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