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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 Diademoceras ： ウィキペディア英語版 Diademoceras ''Diademoceras'' is a nautiloid cephalopod from the middle Ordovician of North America, named by Rousseau Flower,1945. The genus is a tainoceratacean included in the nautilid family Rutoceratidae. The shell of ''Diademoceras'' is gyroconic, of no more than two whorls, coiled such that whorls do not touch. Whorls are broad, section depressed, sides converge ventrally meeting at a well developed keel. Ornamentation consists of a series of spines on either side as well as transverse straie which form a well developed hyponomic sinus (for the funnel) on the venter. Sutures are straight across the venter, but form a broad shallow lobe on the dorsum. The siphuncle is close to the venter, composed of straight and empty segments, i.e. orthochoanitic. ==References== *Bernhard Kummel 1964. Nautiloidea-Nautilida Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press. 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「Diademoceras」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.