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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 Cyrtocycloceras ： ウィキペディア英語版 Cyrtocycloceras ''Cyrtocycloceras'' is an orthocerid genus from the Middle Silurian of Europe included in the Paraphragmitidae. The shell, or conch, of ''Cyrtocycloceras'' is a moderately expanding annulated exogastric cyrtocone, with curvature like that of a rocking chair rocker. Annulations, encircling ribs, are close spaced and transverse and the surface is transversely striated. ''Calocyrtoceras'' from the Middle Silurian of both Europe and North America is striated both transversely and longitudinally while ''Gaspocyrtoceras'' is striated only longitudinally. Moreover the annulations on ''Calocyrtoceras'' and ''Gaspocyrtoceras'' tend to be thicker and further apart than on ''Cyrtocycloceras''. ==References== * Walter C. Sweet, 1964. Nautiloidea- Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological 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「Cyrtocycloceras」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.