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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 Perimecoceras ： ウィキペディア英語版 Perimecoceras ''Perimecoceras'' is a nothoceratid, nautilitoid order oncocerida, with a slowly expanding, compressed, cyrtoconic shell, known from the Upper Silurian of central Europe. ''Perimecoceras'' is similar in general form to the oncoceratid genus ''Oonoceras'' from which it may have been derived, but differs in having a longer body chamber in proportion and in having concave segments to its siphuncle. It as also the most likely ancestral nothoceratid, probably giving rise to ''Blakeoceras'' and other Nothoceratidae. ''Perimecoceras'' probably lived on the sea floor, body chamber horizontal, phragmocone behind arched upward away from the bottom, using a combination of crawling and jet-swimming as it moved about. ==-References-== * Sweet, W.C. 1964; Nautiloidea -Oncocerida; Treatise on Invertebrate Paleontology, Part K; Geological Society of America and University of Kansas press; Teichert and Moore (eds) *(''Perimecoceras''-Paleodb ) 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「Perimecoceras」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.