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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 Hammatoceras ： ウィキペディア英語版 Hammatoceras ''Hammatoceras'' is an ammonite genus belonging to the family Hammatoceratidae which lived during the Late Toarcian stage of the Early/Lower Jurassic between about 184 and 175 million year ago. ==Description== The shell of ''Hammatoceras'' varies from evolute to sub-involute, according to species and growth stage. All are compressed, i.e. discoidal, in form, with strong ribbing and a keeled ventor. Ribs arise from tubercles on the umbilical shoulder, the inner, dorso-lateral margin of the whorls, and bifurcate on the flanks, stopping at the ventral keel. Juvenile forms tend to be more evolute with more of the inner whorls showing, whereas mature forms tend to be more involute with outer whorls more strongly embracing. 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「Hammatoceras」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.