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mastodont
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mastodont
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哺乳纲(化石)
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mastodont
乳齿象
狭义的作为一个属名,现在被认为是玛姆象属(Mammut)的同物异名,在分类学上已被弃置不用,仅作为美洲乳齿象(Mammut americanum)的通称。而广义的曾经被作为一个超科分类单元,包括了从晚渐新世到更新世的多种象类。随着系统演化理论和支序分系方法的兴起,乳齿象这一并系的类群逐渐被拆解,最终不再成为正式的分类单元。从现在的分类角度,广义的乳齿象类包括现在的古乳齿象类、玛姆象类、嵌齿象类,以及剑齿象类和真象类的最原始的成员。
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