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Cadoceras
''Cadoceras'' is an extinct ammonite genus belonging to the Cardioceratidae that lived during the Jurassic period from the late Bajocian to the early Callovian.〔Jack Sepkoski's online list of cephalopod genera. () 〕 ==Morphology== The typical ''Cadoceras'' shell is strongly ribbed, subglobular, with a broadly rounded venter, strongly embracing whorls, deep umbilicus, and a smile-like crescent-shaped aperture. Ribs arise from the umbilical shoulder and bifurcate(divide in two) about mid flank and cross the venter without interruption. Species vary in the nature of ribbing and roundness of the umbilical shoulder.〔 (ammonites.fr ''Cadoceras'' entry )〕 〔(jsdammonites.fr ''Cardioceratidae'' entry )〕
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「Cadoceras」の詳細全文を読む
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