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glires
释义
glires
Encyclopedia
理学
哺乳纲(化石)
释
glires
啮型类
最早由C.von林奈(1735)提出,初为对现生兔形类和啮齿类两类小型哺乳动物的合称,因为它们都发育有一对终生生长(无根)且具有“啃啮”(gnawing)功能的门齿(DI2/di2)。此外,它们也没有犬齿,前臼齿都很退化。有人建议将啮型类提升为啮型大目(Grandorder),定义为现生的啮齿类和兔形类的共同祖先及其后裔形成的支系。它包括了由啮齿目(Rodentia)和混齿目(Mixodontia,通常认为是啮齿类的基干类群)组成的单门齿类和由兔形目(Lagomorpha)及模鼠兔目(Mimotonida,通常认为是兔形类的基干类群)组成的双门齿类。
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