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Cardioceras
''Cardioceras'' is an extinct ammonite genus belonging to the family Cardioceratidae. These fast-moving nektonic carnivores lived during the Jurassic period, Oxfordian age. 〔 Sepkoski, Jack (Sepkoski's Online Genus Database – Cephalopoda )〕〔(Mikko's Phylogeny Archive )〕 ==Description== Shells of ''Cardioceras'' species can reach a diameter of .〔(Cardioceras.ru )〕 The shape is circular, with ribs and a prominent ridge along the dorsal edge. 〔(Encyclopaedia Britannica )〕
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「Cardioceras」の詳細全文を読む
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