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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 Mongoceras ： ウィキペディア英語版 Mongoceras ''Mongoceras'' is an extinct orthoconic nautiloid cephalopod found in the Silurian of China and Siberia.〔(PaleoBiology Database ''Mongoceras''entry ) accessed 10 July 2012〕 It is included in the Orthocerida.〔(Sepkoski's list of Cephalopod genera )〕 The family in undetermined. ==Morphology== As with the Orthocerida the shell of ''Mongoceras'' is generally long and straight, with a generally central siphuncle composed of thin connecting rings. A vertical, heads down orientation in life can be inferred, in contrast with the horizontal benthic orientation of ellesmerocerida, endocerids, and many actinocerids with their weighted ventral siphuncles. 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「Mongoceras」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.