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贫齿目
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贫齿目
Encyclopedia
理学
哺乳纲(化石)
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贫齿目(化石)
曾是哺乳纲下的一个分类单元,包括管齿类、鳞甲类、异节类、纽齿类、冈瓦纳兽等。这些动物共有的一个演化趋势是牙齿丢失或简化,适应于取食蚂蚁或白蚁。研究认为,这一演化趋势在上述这些动物中是趋同演化的结果,这些动物之间并没有密切的亲缘关系,因此贫齿目这一分类单元已经很少有人使用。
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