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''Calocyrtoceras'' is an orthocerid genus (Cephalopoda, Nautiloidea), from the middle Silurian of North America (Quebec) and central Europe. The shell, or conch, of ''Calocyrtoceras'' is generally characteristic of its family, the Paraphragmitidae, an anulated cyrtocone. In the case of ''Calocyrtoceras'' striated both transversely and longitudinally. Similar ''Cyrtocycloceras'' from the Middle Silurian of Europe is only striated transversely while similar ''Gaspocyclocas'' from the Middle Silurian of North America is only striated longitudinally. ==References== * Walter C. Sweet, 1964. Nautiloidea -Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America. * (''Calocyrtoceras'' ), Fossilworks, PaleoDB gateway 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「Calocyrtoceras」の詳細全文を読む スポンサード リンク
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