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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 Osbornoceras ： ウィキペディア英語版 Osbornoceras ''Osbornoceras'' is a Lower Silurian cyrtoconic nautiloid cephalopod known from Ohio and possibly Manitoba, one of five general currently included in the oncocerid family Karoceratidae. ==Diagnosis -morphology== ''Osbornoceras'' grew to be somewhat large and is characterized by a narrow, compressed, strongly curved, exograstric shell. The venter, on the outside curvature, is narrowly rounded while the dorsum, on the opposite inside curvature, is more broadly rounded. The body chamber narrows toward the aperture, which has a deep hypomomic sinus. The siphuncle of ''Osbornoceras'' is ventral but not in contact with the ventral wall of the shell. Segments are empty and expanded ventrally but are virtually straight dorsally. Connecting rings are thin, septal necks cyrtochoanitic (outwardly flared). 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「Osbornoceras」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.