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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 Grypoceras ： ウィキペディア英語版 Grypoceras ''Grypoceras'' is a coiled nautiloid cephalopod from the Triassic of western North America, southern Asia, and Europe that belongs to the nautilid family Grypoceratidae. Named by Alpheus Hyatt in 1883, the shell of ''Grypoceras'' is essentially involute with a subtriangular cross section, widest across the umbilical shoulders, with flanks fairing toward a narrow flattened venter. Sutures on flanks are with smooth, deep lobes and with shallow ventral lobes. The earlier, related ''Domatoceras'' is evolute, with a more quadrate whorl section. ''Gryponautilus'', from the Upper Triassic, is more strongly involute and has a sharply keeled venter. ==References== * Bernhard Kummel, 1964, Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press. *(Paleobiology Database ''Grypoceras'' entry ) accessed 7 July 2012 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「Grypoceras」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.