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Idoceras
''Idoceras'' is a genus of perisphictacean ammonite, belonging to the Perisphinctidae subfamily Idoceratinae. The genus is known from the Upper Jurassic, with a widespread distribution. Shells of ''Idoceras'' are evolute, with a wide umbilicus; ribbing strong, bifurcate high on flanks. Suture simpler than in the similar ''Ataxioceras''. ==References==
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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「Idoceras」の詳細全文を読む
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