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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 Ophidioceratidae ： ウィキペディア英語版 Ophidioceratidae The Ophidioceratidae is a family of closely coiled tarphycerids, represented solely by the Upper Silurian genus, ''Ophioceras'', characterized by an evolute shell with narrow, subrounded, annulated whorls and a subcentral siphuncle composed of thin connecting rings that show no evidence of layering. The mature body chamber is strongly divergent and is the longest proportionally of any tarphycerid. The aperture has a deep hyponomic sinus and ocular sinuses, and so resembles some lituitids. The Ophidioceratidae seems to have its origin in the Trocholitidae, possibly in ''Graftonoceras''. ==''References''== * Furnish, W. M, and Glenister, Brian F. 1964. Nautiloidea - Tarphycerida, Treatise on Invertebrate Paleontology, Part K, Geo Soc. of America. Teichert and Moore (eds.) 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「Ophidioceratidae」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.