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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 Kayoceras ： ウィキペディア英語版 Kayoceras ''Kayoceras'' is a middle Silurian nautiloid cephalopod, known from Iowa and Illinois, belonging to the Discosoridae. Related genera include ''Discosorus'', ''Endodiscosorus'', and ''Stokesoceras''. ''Kayoceras'' has a short, breviconic shell, like ''Discosorus'', but with a more central siphuncle. Derivation is probably from ''Discosorus'', through an evolutionary shifting of the siphuncle position, which has its origin in the Lowoceratidae, possibly through ''Tuyloceras''. ==References== * Curt Teichert, 1964. Nautiloidea -Discosorida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press. * (''Kayoceras'' ) , Paleobiology database. 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「Kayoceras」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.