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来自维基百科,自由的百科全书
弓角石(學名:Cyrtoceras),又名弓形角石,是一屬已滅絕的鸚鵡螺類。其化石分布於非洲、歐洲和美洲等地。牠們可能是頭朝下生活在海底附近,能夠游泳,且能調節自身的浮力。[2]
弓角石的殼形為彎曲的長牙狀,稱為「弓角石式殼」(cyrtoceracone)。殼的後段由眾多排列緊密的殼室組成。[2]
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