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''Jiagouceras'' is an early primitive cephalopod from the Upper Cambrian of China, assigned to the Plectronoceratidae. The shell is small, nearly straight with a slight endogastric curvature and compressed cross section. The siphuncle is close to the ventral margin, with segments expanded into the chambers. ''Jiagouceras'' is found in the Wanwankou member of the Fengshan formation (Early, Middle and Upper Trempealeauan) in northern Anhui, China. It is similar to ''Paraplectronoceras'' except for having more strongly expanded siphuncular segments and less concave septa. ==References== *Chen Jun-yuan et al., 1979 (Late Cambrian Cephalopods of North China -- Plectronocerida, Protactinocerida (Ord Nov) and Yanhecerida (Ord Nov) ) * * Teicher, C. 1988. Main Feature of Cephalopod Evolution. ''in'' The Mollusca, volume 12, Paleontology and Neontology of Cephalopods. Clark and Trueman (eds). Academic Press. * (Paleobiology DB - Jiagouceras ) 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「Jiagouceras」の詳細全文を読む スポンサード リンク
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