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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 Zetoceras ： ウィキペディア英語版 Zetoceras ''Zetoceras'' is an extinct ammonoid cephalopod genus from the suborder Phylloceratina that lived during the Early and Middle Jurassic in what is now Europe, and is included in the (family) Phylloceratidae. ''Zetoceras'' has a compressed involute shell with a very small umbilicus. The suture is phylloid, as for the suborder,with tall primary sutural elements. Saddles commonly have tetraphyllic endings.〔 ''Zetoceras'' is considered by some (Wright ''et al'' 1996) to be a sugenus of Phylloceras. The two are very similar except that the saddle endings in Phylloceras split in three rather than in four as in ''Zetoceras''. ==References== * Wright, Calloman, and Howarth. 1996; Cretaceous Ammonoidea. Treatise on Invertebrate Paleontology L(4) * (The Paleobiology Database ''Zetoceras'' entry ) 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「Zetoceras」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.