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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 Masonoceras ： ウィキペディア英語版 Masonoceras ''Masonoceras'' is a Karagondoceratid from Lower Mississippian strata, the shell of which is thinly subdiscoidal to discoidal with an acute ventral margin in late ontogeny. Whorls are strongly embracing, umbilicus narrow to occluded. The mature external suture contains a wide trifid ventral lobe, the flanking prongs longer that the medial, an asymmetrically rounded lateral saddle and a deeper asymmetric pointed lateral lobe. Internal molds of the type, ''Mesoceras Kentuckiense'' show presence of a broad hyponomic sinus flanked by high rounded vantrolateral salients. ''Mesonoceras'' is similar in general form to tis probable ancestor ''Karagandoceras'' but differs primarily in its pointed asymmetric lateral lobe, that of ''Karagandoceras'' is more symmetric. ==''References''== * ''Mesonoceras'', A New Karadondoceratid Ammonoid from the Lower Mississippian (Lower Osagean) of Kentucky. David M. Work and Walter L. Manger. Jour Paleo vol 6, no 3 May 2002. 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「Masonoceras」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.