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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 Michelinoceras ： ウィキペディア英語版 Michelinoceras ''Michelinoceras'' is the oldest known genus of the Michelinocerida, more commonly known as the Orthocerida, characterized by long, slender, nearly cylindrical orthocones with a circular cross section, long camerae, very long body chambers, and a central or near central tubular siphuncle free of organic deposits. Septal necks are straight; connecting rings cylindrical and thin. Cameral deposits are well developed. A radula has been found in one species, with seven teeth per row. It had ten arms, two of which formed longer tentacles.〔 ==Range== ''Michelinoceras'' ranges from late in the Early Ordovician to the Devonian with more poorly known species from the Carboniferous to the Late Triassic included in the genus. The earliest known for sure is ''Michelinoceras primum'' found in Cassinian age strata near the top of the El Paso Group in southern New Mexico and west Texas. A less well known species of ''Michelinoceras'', ''M. primum?'', comes from further down in the same formation, near the beginning of the Cassinian. 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「Michelinoceras」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.