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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 Danaoceras ： ウィキペディア英語版 Danaoceras ''Danaoceras'' is a nautiloid cephalopod from the middle Silurian of central Europe included in the oncoceroid family Polyelasmoceratidae. Similar specimens from the middle Devonian of North America may belong. ''Danaoceras'' has a laterally compressed shell curved such that the ventral or siphuncular side is longitudinally concave, i.e. is endograstric. The siphuncle, which is ventrally submarginal, contains laminar actinosiphonate deposits. ''Danaoceras'' is the ancestral genus of the Polyelasmoceratidae and is possibly derived from either ''Oonoceras'' or ''Oocerina'' of the Oncoceratidae based on similarities of the siphuncle ==References== * Walter C. Sweet, 1964. Nautiloidea - Oncocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America. 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「Danaoceras」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.