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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 Tragodesmoceras ： ウィキペディア英語版 Tragodesmoceras ''Tragodesmoceras'' is a large moderately involute ammonite with deeply embracing whorls that are higher than wide, a steep sided umbilicus and a narrowly rounded venter. Ornament consists of primary ribs that begin at the umbilical shoulder and smaller secondary ribs that begin mid flank. Ribs are sigmodal, periodically thickened and bent forward on the outer flank to cross the venter as chevrons. The suture has a broad trifid lateral lobe. Species include ''Tregodesmoceras clypealoides'' (type), known from western Europe and the U.S., ''Tragodesmosderas bassi'', known from Arizona and Kansas, and ''Tragodesoceras socorroense'' known from Arizona and New Mexico. The related ''Muniericeras'' is more evolute in form, but otherwise similar. ==References== * W.J. Arkell, et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleonotology Part L Mollusca 4. Geological Society of America and University of Kansas Press. * William A Cobban & Stephen C. Hook. 1983. . Mid-Cretaceous (Turonian) ammonite fauna from Fence Lake area of west-central New Mexico. Memoir 41 New Mexico Bureau of Mines and Mineral Resources. 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「Tragodesmoceras」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.