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''Olcostephanus'' is an extinct ammonoid cephalopod genus belonging to the family Olcostephanidae. These fast-moving nektonic carnivores 〔 lived during the Cretaceous, from the upper Valanginian to the lower Hauterivian age. 〔 Sepkoski, Jack (Sepkoski's Online Genus Database – Cephalopoda )〕 ==Species== 〔 *''Olcostephanus astierianus'' d'Orbigny 1840 *''Olcostephanus atherstoni'' Sharpe 1856 *''Olcostephanus bakeri'' Imlay 1937 *''Olcostephanus bosei'' Riedel 1938 *''Olcostephanus delicatecostatus'' Haas 1960 *''Olcostephanus detonii'' Rodighiero 1919 *''Olcostephanus filifer'' Imlay 1937 *''Olcostephanus laticosta'' Gerth 1925 *''Olcostephanus paucicostatus'' Imlay 1937 *''Olcostephanus pecki'' Imlay 1960 *''Olcostephanus popenoei'' Imlay 1960 *''Olcostephanus prorsiradiatus'' Imlay 1937 *''Olcostephanus quadriradiatus'' Imlay 1938 *''Olcostephanus sanlazarensis'' Imlay 1937 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「Olcostephanus」の詳細全文を読む スポンサード リンク
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