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''Rasenia'' is an extinct ammonoid cephalopod genus belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Upper Jurassic period, in the Kimmeridgian age.〔 ==Etymology== This genus gets its name from Market Rasen in Lincolnshire (Midland England), place where it is frequently found. 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「Rasenia」の詳細全文を読む スポンサード リンク
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