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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 Hammatoceratoidea ： ウィキペディア英語版 Hammatoceratoidea Hammatoceratoidea, formerly Hammatocerataceae is a superfamily of middle Jurassic ammonites (order Ammonitida), erected by Schindewolf (1964) that combines the families Graphoceratidae, Hammatoceratidae, and Soninniidae.〔(Paleobiology Database Hammatoceratoidea entry )〕 The three families were previously included in the Hildocerataceae, and subsequent classifications.〔D.T. Donovan ''et al'' 1981. Classification of Jurassic Ammonitina. The Ammonoidea. Systematics Association special volume 18.〕 In more recent classifications Hammotocerataceae are referred to as Hammatoceratoidia. Shells of hammatoceratoids are variably evolute or involute, ribbed at least in the early growth stage; cross section typically compressed (higher than wide); venter commonly with a median keel. Hammatoceratoidea is derived from the family Phymatoceratidae of the Hildoceratoidea, beginning with the Hammatoceratidae near the end of the Early Jurassic. ==References== 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「Hammatoceratoidea」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.