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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cravenoceras ： ウィキペディア英語版 Cravenoceras ''Cravevoceras'' is an Upper Paleozoic ammonite in the gonititid family Cravenoceratidae, probably derived from ''Pachylyroceras'' and contemporaty with other cravenoceratid genera like ''Caenolyroceras'', ''Tympanoceras'' and later ''Alaoceras'' and ''Lyrogoniatites''. It is also a member of the Neoglyphiocerataceae. ==Description== The shell of Cravenoceras is thickly discoidal to globose and moderately to widely umbilicate. Young stages are mostly extremely evolute. Sculpture consists of transverse lamellae, which are more or less straight on the flanks, but form a shallow ventral sinus. Longitudinal lirae mostly absent or very faint, sometimes restricted to umbilical shoulder. Constrictions are weak or absent. The ventral lobe is narrow, with a relatively low median saddle. 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「Cravenoceras」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.