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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 Tithonoceras ： ウィキペディア英語版 Tithonoceras ''Tithonoceras'' is a genus of nautiloid cephalopod from the Upper Jurassic (Thithonian stage) found in the Crimea, belonging to the nautilacean family Paracenoceratidae. The shell of ''Tithonoceras'' is evolute, coiled with all whorls exposed, smooth, and laterally compressed. The whorl section is subquadrangular with a broad, flattened venter on the outer rim. Ventrolateral shoulders are inflated, forming broad, rounded, keels, bordered by broad furrows on the flanks. The suture is sinuous, with ventral and lateral lobes. The position of the siphuncle is unknown. ==References== * Barnhard , 1964. Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology, Part K. Geol. Soc. of America and Univ. Kansas Press. * Paleobiology database (Tithonoceras ) * Sepkoski, 2002. (Cephalopod genera ) 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「Tithonoceras」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.