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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 Paraceltitidae ： ウィキペディア英語版 Paraceltitidae Paraceltitidae is a family of Middle and Upper Permian cephalopods, that comprise the earliest of the Ceratitida. Paraceltitidids have variably ribbed, discoidally evolute shells with compressed elliptical whorl sections and simple suture lines. Their origin is most likely in the Daraelitidae of the Prolecanitida and they are the apparent source of the Xenodiscidae. All together they lived for some 12 million years, from about 270.6 to about 258 million years ago. Paraceltitidae was named by Spath in 1930, however the taxon is omitted in the Treatise on Invertebrate Paleontology Part L, 1957 wherein respective genera are included in the Xenodiscidae. The family has returned to recognition and has been used by Tozer, 1981 and more recently by Leonova in 2002 and by Korn in 2006. ==References== * (GONIAT-online ) 7/26/11 * (The Paleobiology Database Paraceltitidae entry ) accessed 7/26/11 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「Paraceltitidae」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.