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''Oelandia'' is an extinct genus of basal molluscs of the family helcionellid from the Middle Cambrian of Sweden, China and North America. It has a small, upwards-pointing anterior snorkel with a closed end. It bears pronounced concentric ribbing around its strongly coiled exogastric shell.〔 ==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「Oelandia」の詳細全文を読む スポンサード リンク
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