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Coilopoceratidae is a family of generally large, proper ammnites with strongly involute shells from the Upper Cretaceous, Turonian and Coniacian stages. Coilopoceratids have variably compressed shells with flattish to broadly rounded sides and narrowly rounded to sharp keel-like venters. Whorl sections are generally lanceolate. The suture is ammonitic with an overall clumpy appearance. The Coilopoceratidae are derived from the Tissotiidae by a secondary re-development of an ammonitic suture and of more narrowly compressed shells. ==Genera== *''Coilopoceras'' Hyatt, 1903 (synonym = ''Glebosoceras'' Reyment, 1954) - from north and west Africa, Syria, Baluchistan, and western North America (Colorado, New Mexico, Texas). *''Herrickiceras'' Cobban & Hook, 1980 - from Western North America, central Africa, and the Middle East. *''Hoplitoides'' von Koenen, 1898 – from north and west Africa, Syria, Columbia, Peru, western North America. 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「Coilopoceratidae」の詳細全文を読む スポンサード リンク
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