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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 Hildoceras ： ウィキペディア英語版 Hildoceras |image = Hildoceras spp.jpg |image_caption = ''Hildoceras'' sp. |taxon = Hildoceras |authority = Hyatt, 1876 |subdivision_ranks = Species |subdivision = * ''Hildoceras semipolitum'' * ''Hildoceras bifrons'' }} ''Hildoceras'' is a genus of ammonite form the Jurassic〔 in the family Hildoceratidae. The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral goove running along smooth inner flanks. Whorls slightly overlap, cross sections are compressed. The ventral keel is bordered on either side by a shallow groove. The genus was named by Alpheus Hyatt after Saint Hilda in 1876, and fossils have been found in Europe and Japan. ==Distribution== Jurassic of Bulgaria, France, Germany, Hungary, Italy, Japan, Luxembourg, Serbia and Montenegro, Spain, the United Kingdom 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「Hildoceras」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.