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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 Grimsbyoceras ： ウィキペディア英語版 Grimsbyoceras ''Grimsbyoceras'' is a nautiloid genus included in the Oncocerida order of the family Acleistoceratidae that lived during the Middle Devonian. They have been found in North America (Illinois) and central Europe. ''Grimsbyoceras'', named by Foerste in 1926, has a depressed, breviconic shell, with an elliptical transverse aperture, without a hyponomic sinus, and a small, subventral siphuncle. The phragmocone is rapidly expanding and strongly exogastric. The body chamber is attached at knee-like bends on the ventral and lateral sides. ''Acleistoceras'' and ''Poteriocerina'' are similar acleistoceratids from the Middle Devonian, differing primarily in internal detail. ==References== * 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「Grimsbyoceras」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.