Phaedrysmocheilus

Phaedrysmocheilus is a genus of Early Triassic Tainoceratids (Nautiloidea, Cephalopoda) from Siberia. The shell is a rapidly expanding, moderately involute nautilicone; smooth in the adult stage but laterally ribbed in the juvenile stage. Volutions are convex laterally, arched ventrally, embraced dorsally. Whorl sections change during development from being slightly depressed, early, to slightly compressed later, changing from being relatively wide to relatively high. The umbilicus is deep and funnel shaped. Sutures are slightly sinuous.

References[]

This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please help to improve this article by introducing more precise citations. (August 2012) (Learn how and when to remove this template message)

• Bernhard Kummerl, 1964. Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology Part K. Geological Society of America and University of Kansas Press.
• Phaedrysmocheilus, Paleobiology Database [1]
• J.J. Sepkoski, 2002. List of Cephalopod genera. [2]

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