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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 Gaspocyrtoceras ： ウィキペディア英語版 Gaspocyrtoceras ''Gaspocyrtoceras'' is an orthocerid genus included in the Paraphragmitidae. Its fossils are limited to North America and have been found in Wisconsin and Quebec. The shell of ''Gaspocyrtoceras'' is a coarsely annularted exogastric cyrtocone. Curvature is upward, the ventral side convex in profile. Annulations slope dorso-ventally to the rear as they do in ''Calocyrtoceras''. Striations on the surface, fine goove-like features, are longitudinal in contrast to the transvere striations of ''Cyrtocycloceras''. ==References== * Walter c. Sweet, 1964. Nautiloidea- Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geologica Society of 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「Gaspocyrtoceras」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.