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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 Tarphyceras ： ウィキペディア英語版 Tarphyceras ''Tarphyeras'' is a genus of tarphyceratid with whorls rounded in cross section, having a deeply impressed dorsum and a ventral to subcentral siphuncle, known from the Lower Ord (U Canad) of North America. It differs from ''Campbelloceras'' in that ''Campbelloceras'' is only slightly impressed, from ''Centrotarphyceras'' in that ''Centrotarphyceras'' is subquadrate and has a central siphuncle, and from ''Trocholites'' in that although ''Trocholites'' is subcircular in cross section, the siphuncle is subdorsal. ''Taphyceras'' may be derived from ''Campbelloceras'' through development of tighter coiling and a deeper impression along with a smaller siphuncle that may be further offset from the venter. ''Tarphyceras'' was named by Hyatt in 1894. ==References== * Furnish and Glenister 1964,Nautiloidea - Tarphycerida, K354, in The Treatise on Invertebrate Paleontology Vol K; Teichert and Moore, (eds) GSA and U of Kansas Press,1964 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「Tarphyceras」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.