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内蒙古乌兰塔塔尔地区早渐新世梳趾鼠类头骨新材料

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  • 1 中国科学院古脊椎动物与古人类研究所,中国科学院脊椎动物演化与人类起源重点实验室 北京 100044
    2 中国科学院生物演化与环境卓越创新中心 北京 100044
    3 中国科学院大学 北京 100049

收稿日期: 2019-08-20

  网络出版日期: 2020-10-19

基金资助

中国科学院战略性先导科技专项(B类)(XDB 26000000);国家自然科学基金(41572013);中国地质调查局地质调查项目(DD20190009);古生物化石发掘与修理专项经费资助

New skulls of ctenodactyloids from the Early Oligocene of Ulantatal, Nei Mongol, China

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  • 1 Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Beijing 100044
    2 CAS Center for Excellence in Life and Paleoenvironment Beijing 100044
    3 University of Chinese Academy of Sciences Beijing 100049

Received date: 2019-08-20

  Online published: 2020-10-19

摘要

记述了4件采自内蒙古乌兰塔塔尔早渐新世地层的近乎完整的、上下颌咬合在一起的梳趾鼠类头骨化石,基于牙齿特征将新材料归于乌兰塔塔尔丘齿鼠(Bounomys ulantatalensis Huang, 1985)。乌兰塔塔尔丘齿鼠与始新世梳趾鼠类钟健鼠(Cocomys)及外鼠(Exmus)相比,在头骨整体形态,门齿孔、眶下孔、蝶腭孔、听泡的大小,后鼻孔、泪孔、眶后突的位置,顶骨及外耳道的形态,下颌骨齿隙长短等方面有明显差别;与渐新世及以后的梳趾鼠类的头骨特征整体相似。通过对梳趾鼠类头骨特征的对比,认为从始新世至渐新世,梳趾鼠类颧-咬结构由始啮型转为豪猪型,咬合能力增强,更有利于处理粗糙的食物;听泡膨大,使得其更适应开阔环境。头骨上的这些变化可能是对始新世-渐新世转折期后全球气候干旱化的一种适应。

本文引用格式

徐冉成, 李茜 . 内蒙古乌兰塔塔尔地区早渐新世梳趾鼠类头骨新材料[J]. 古脊椎动物学报, 2020 , 58(4) : 305 -327 . DOI: 10.19615/j.cnki.1000-3118.200413

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