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''Tylocidaris'' is an extinct genus of echinoid that lived from the Early Cretaceous to the Eocene. Its remains have been found in Europe and North America. ==Sources== * ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 177) 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「Tylocidaris」の詳細全文を読む スポンサード リンク
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