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|regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |superfamilia = Hildocerataceae |familia = Hildoceratidae |genus = ''Asthenoceras'' |genus_authority = Buckman, 1899 |subdivision_ranks = Species |subdivision =See text. }} ''Asthenoceras'' is a dwarfish, Middle Jurassic (Lower Bajocian) ammonoid with an evolute, smooth, compressed, discoidal, strongly keeled shell. ''Asthenoceras'' belongs to the Hildoceratidae (subfamily Grammoceratinae) and may be a subgenus of the Lower Jurassic (Upper Toarcian) ''Grammoceras''. ==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「Asthenoceras」の詳細全文を読む スポンサード リンク
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