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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 Geisonoceras ： ウィキペディア英語版 Geisonoceras ''Geisonoceras'' is an orthocerid genus named by Hyatt, 1884, and type for the Geisonoceratidae established by Zhuravleva in 1959. It has been found in North America, Europe, and Asia. Shells are elongate, straight or slightly curved, and slowly expanding with a circular or subcircular cross section, transverse aperture and slight hyponomic sinus. The surface has broad transverse bands with fine growth lines between. Sutures are straight, transverse or slightly oblique. The siphuncle is subcentral, necks short and straight, connecting rings slightly expanded into the chambers. ==References== *Walter A Sweet, 1964. Nautiloidea -Orthocerida, ''Treatise on Invertebrate Paleontology'' Part K, Endoceratoidea, Actinoceratoidea, Nautiloidea. Geological Society of America and Univ Kansas Press. 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「Geisonoceras」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.