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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 Galtoceras ： ウィキペディア英語版 Galtoceras ''Galtoceras'' is a cyrtoconic nautiloid from the Middle Silurian of North America, named by Foerste in 1934. ''Galtoceras'' is genus of the Oncocerida and of the oncocerid family Acleistoceratidae. As with the ascleistoceratids, the curvature is exogastric, such that the lower side, or venter, is on the outside curve. The shell is elongate and slender, wider than high, with a subventral, empty, cyrtochoanitic siphuncle, with segments somewhat expanded into chambers but abruptly narrowed at septal openings. ''Euryrizoceras'' and ''Tumidoceas'' are similar genera, also included in the Acleistoceratidae, but which are less slender than ''Galtoceras''. ==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「Galtoceras」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.