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| image = | image_caption = | taxon = Crania | genus_authority = Retzius, 1781 | subdivision_ranks = species | subdivision = }} ''Crania'' is an extinct genus of brachiopods that lived during the Upper Cretaceous. == Description == ''Crania'' has small (up to in diameter) circular shells. The dorsal valve is smooth or has slight pustules. The ventral valve is only attached posteriorly and has a thickened flat grainy rim. 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「Crania (brachiopod)」の詳細全文を読む スポンサード リンク
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