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Orthaspidoceras : ウィキペディア英語版 | Orthaspidoceras
''Orthaspidoceras'' is an extinct ammonoid cephalopod genus belonging to the family Aspidoceratidae. These nektonic carnivores lived during the Jurassic period, Kimmeridgian age.〔Sepkoski, Jack (Sepkoski's Online Genus Database – Cephalopoda )〕 ==Description== Shells of ''Orthaspidoceras'' are medium or large-sized, with a diameter reaching about . These shells are relatively involute and thick, with a quadrate-rounded or depressed whorls. The ornamentation consists of a row of coarse tubercles and fine streaks.〔(Jean-ours.filippi )〕
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「Orthaspidoceras」の詳細全文を読む
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