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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 Codoceras ： ウィキペディア英語版 Codoceras ''Codoceras'' is a nautiloid genus belonging to the Polyelasmoceratidae, an Oncocerida family. ''Codoceras'', known from the Silurian of Europe, has a compressed, rapidly enlarging shell, curved endogastrically such that the presumed ventral side is concave and the opposite dorsal side is convex. The siphuncle is displaced from the center slightly toward the venter. Early segments are cylindrical. Later ones are nummuloidal and broader. The type species is ''Cyrtoceras indominum'' Barrande 1866. ''Danaoceras'' is closely related and its most likely ancestor. ==References== *Walter C. Sweet, 1964. Nautiloidea - Oncocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press. 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「Codoceras」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.