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''Hardouinia'' is an extinct genus of echinoid that lived in the Late Cretaceous. Its remains have been found in North America. ==Sources== * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 182) 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「Hardouinia」の詳細全文を読む スポンサード リンク
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