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Lyelliceras
''Lyelliceras'' is a genus of ammonites belonging to the family Gaudryceratidae. These cephalopods were fast-moving nektonic carnivores. They lived in the Cretaceous period, Albian stage (109.0 to 99.7 Ma).〔(Fossilworks )〕〔Sepkoski, Jack (Sepkoski's Online Genus Database - Cephalopodes )〕 ==Description== Shells of ''Lyelliceras'' species can reach a diameter of about . The are moderately to very evolute. The section of the whorls is slightly compressed or circular, with straight radial ribs.〔(Crioceratites )〕〔(Ammonites )〕
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「Lyelliceras」の詳細全文を読む
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