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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 Xenocephalites ： ウィキペディア英語版 Xenocephalites ''Xenocephalites'' is an extinct ammonoid cephalopod genus from the late Middle Jurassic belonging to the stephanoceratoid family Macrocephalitidae. It is known from southern Alaska, Greenland, Mexico, and Argentina. ''Xenocephalites'' can be recognized by its coarsly ribbed, prominently umbilicate, involute shell where in ribs are widely splayed, tending to bifurcate high on the flanks. ''Macrocephalites'' is similar except that its ribbing is finer and more dense. In both the ribbing crosses uninterrupted over the venter. ==References== *Arkell, et al., Mesozoic Ammonoidea' ''Treatise on Invertebrate Paleontonology'', Part L (1957); Geological Society of America. *(Xenocephalites ), Paleo db. 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「Xenocephalites」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.