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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 Oonoceras ： ウィキペディア英語版 Oonoceras ''Oonoceras'' is an extinct fossil cephalopod included in the nautiloid order Oncocerida and family Oncoceratidae from the Middle Ordovician to Middle Silurian of North America and Europe, arbitrarily included in the Slender Oncoceratidae. Shells of this genus are generally slender, gradually expanding, exograstric cyrtocones with an ovoid cross section more narrowly rounded ventrally than dorsally as in (e.g.) ''Bassleroceras''. Curvature is generally greater than that in ''Oocerina'' but less than that of ''Richardonoceras'' or ''Dunleithoceras''. The siphuncle of ''Oonoceras'' is cyrtochoanitic. Septal necks flare outwardly and unlike ''Oocerina'', are empty. Segments are either slightly or broadly expanded into the chambers. ==References== * Walter C. Sweet, 1964. Natiloidea -Oncocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America. * Dinosaurs to Dodos: An Encyclopedia of Extinct Animals by Don Lessem and Jan Sovak 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「Oonoceras」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.