Stem lagomorpha and the antiquity of Glires
Stem lagomorpha and the antiquity of Glires
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DOI：
10.1126/science.1107808
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发表时间：
2005-02-18
期刊：
影响因子：
56.9
通讯作者：
Novacek, MJ
中科院分区：
文献类型：
--
作者：
Asher, RJ;Meng, J;Novacek, MJ
我们描述了几种可与Gomphos elkema相联系的化石，它们来自蒙古Tsagan Khushu古新世-始新世界线附近的沉积物。Gomphos与现存的兔子，野兔和鼠兔共享一套颅骨骼特征，但与现代亲戚相比，保留了原始的齿系和颌骨。系统发育分析支持Gomphos的立场，作为一个干lagomorph和排除白垩纪类群的冠辐射胎盘哺乳动物。我们的研究结果支持这一假设，啮齿动物和兔形动物辐射在新生代和偏离其他胎盘哺乳动物接近第三纪的边界。
We describe several fossils referable to Gomphos elkema from deposits close to the Paleocene-Eocene boundary at Tsagan Khushu, Mongolia. Gomphos shares a suite of cranioskeletal characters with extant rabbits, hares, and pikas but retains a primitive dentition and jaw compared to its modern relatives. Phylogenetic analysis supports the position of Gomphos as a stem lagomorph and excludes Cretaceous taxa from the crown radiation of placental mammals. Our results support the hypothesis that rodents and lagomorphs radiated during the Cenozoic and diverged from other placental mammals close to the Cretaceous-Tertiary boundary.