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| image = | classis = Cephalopoda | suclassis = Ammonoidea | ordo = Ceratitida | superfamilia = Ceratitaceae | familia = Sibiritidae | subfamilia = Keyserlingitinae | genus = ''Olenekoceras'' | genus_authority = | subdivision_ranks = Species | subdivision = * ''O. laevigatum'' * ''O. middendorffi'' * ''O. nikitini'' * ''O. schrenki'' }} ''Olenekoceras'' is an ammonoid cephalopod from the Lower Triassic included in the ceratitid family Sibiritidae, once included in the Noritaceae but now in the Ceratitaceae. ==Distribution== Japan and the Russian Federation. 〔 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「Olenekoceras」の詳細全文を読む スポンサード リンク
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