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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 Eusthenoceras ： ウィキペディア英語版 Eusthenoceras ''Eusthenoceras'' is an Early Carboniferous nautiloid cephalopod with a large depressed, apically curved shell assigned to the Pseudactinoceratidae, (previously ranked as the subfamily Pseudactinoceratinae). The siphuncle is central or located between the center and venter. Necks are cyrtochoanitic, otherwise siphuncle shape and structure are unknown making inclusion in the Pseuactinoceratidae tentative. Siphuncle segments are probably inflated. ''Eusthenoceras'' is known only from the Lower Carboniferous of Ireland. Related ''Bergoceras'' is similar in overall form. ==References== *Walter C Sweet, 1964. Nautiloidea -Orthocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press. *(Eusthenoceras ) in the Paleobiology database, 4/25/14 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「Eusthenoceras」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.