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Gonionautilidae : ウィキペディア英語版
Gonionautilidae

Gonionautilidae is a family in the nautilid superfamily Clydonautiliaceae that contains only the genus ''Gonionautilus'', known from the Upper Triassic (Norian) of Europe and North America. (Alps, state of Nevada)
''Gonionautilus'' has a smooth, compressed involute shell with a narrow flattened venter and angular ventral shoulders. The suture resembles that of ''Clydonautilus'', from which it must have been derived, except for the more highly developed median saddle and bifurcated dorsal lobe.
''Gonionautilus'' (Gonionautilidae) is one of a number of advanced nautiloid cephalopods that developed sutures resembling those of some goniatites in the Ammonoidea.
==''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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