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Phaedrysmocheilus : ウィキペディア英語版 | Phaedrysmocheilus
''Phaedrysmocheilus'' is an Early Triassic Tainoceratid genus (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==
*Bernhard Kummerl, 1964. Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology Part K. Geological Society of America and University of Kansas Press. *''Phaedrysmocheilus'', Paleobiology Database () *J.J. Sepkoski, 2002. List of Cephalopod genera. ()
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Phaedrysmocheilus」の詳細全文を読む
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