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Two large squirrels (Rodentia, Mammalia) from the Junggar Basin of northwestern China demonstrate early radiation among squirrels and suggest forested paleoenvironment in the late Eocene of Central Asia

文献类型：期刊论文

作者Li, Qiang1,2,3; Ni, Xijun1,2,3; Stidham, Thomas A.1,2,3; Qin, Chao1,3; Gong, Hao1,3; Zhang, Limin1,3
刊名FRONTIERS IN EARTH SCIENCE
出版日期2023-01-12
卷号10页码:13
关键词body mass forest paleohabitat Junggar Basin late Eocene morphotype Sciuridae
DOI10.3389/feart.2022.1004509
通讯作者Li, Qiang(liqiang@ivpp.ac.cn) ; Ni, Xijun(nixijun@ivpp.ac.cn)
英文摘要Fossil evidence is indispensable for studying the derivation, divergence, and dispersal of squirrels as they responded to global Cenozoic climatic and paleoenvironmental change. Among these fossil records, the earliest known definitive fossil squirrels in Eurasia occur after the Eocene/Oligocene Boundary and are slightly younger than the oldest records in North America. Here, we report the discovery of two new extinct large squirrel species from the late Eocene of the Junggar Basin in northwestern China. The dental morphologies of these new taxa represent tree and flying morphotypes, and their estimated body masses are approximately 1.2 kg and 2.6 kg, respectively. In addition, these extinct lineages push the age of the first appearance of Sciuridae in northern Asia into the late Eocene. Together with Douglassciurus and Oligospermophilus from North America, these two new squirrels from the Junggar Basin are the earliest records of sciurids, and analysis of their teeth clearly demonstrates that the three principle morphotypes of sciurids (flying, ground, and tree squirrels) had diverged from one another by the late Eocene. That proposed late Eocene divergence among the major groupings of sciurids is consistent with some molecular clock analyses and helps to document that macroevolutionary timing and pattern. Comparison with modern squirrel analogs for body masses over 1 kg points to these early Chinese species as having occupied forested habitats, and that hypothesis is congruent with published palynological studies. Furthermore, these two new squirrel taxa from Jeminay provide new data to evaluate the examination of the long-term aridification of Central Asia.
WOS关键词TIBETAN PLATEAU ; BODY-MASS ; OLIGOCENE TRANSITION ; SCIURIDAE RODENTIA ; FLYING SQUIRRELS ; FAUNA ; ARIDIFICATION ; CLIMATE ; BIOSTRATIGRAPHY ; PHYLOGENY
资助项目Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA2007203]
WOS研究方向Geology
语种英语
出版者FRONTIERS MEDIA SA
WOS记录号WOS:000922813800001
资助机构Strategic Priority Research Program of Chinese Academy of Sciences
源URL[http://119.78.100.205/handle/311034/22279]  
专题中国科学院古脊椎动物与古人类研究所
通讯作者Li, Qiang; Ni, Xijun
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
2.CAS Ctr Excellence Life & Paleoenvironment, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Li, Qiang,Ni, Xijun,Stidham, Thomas A.,et al. Two large squirrels (Rodentia, Mammalia) from the Junggar Basin of northwestern China demonstrate early radiation among squirrels and suggest forested paleoenvironment in the late Eocene of Central Asia[J]. FRONTIERS IN EARTH SCIENCE,2023,10:13.
APA Li, Qiang,Ni, Xijun,Stidham, Thomas A.,Qin, Chao,Gong, Hao,&Zhang, Limin.(2023).Two large squirrels (Rodentia, Mammalia) from the Junggar Basin of northwestern China demonstrate early radiation among squirrels and suggest forested paleoenvironment in the late Eocene of Central Asia.FRONTIERS IN EARTH SCIENCE,10,13.
MLA Li, Qiang,et al."Two large squirrels (Rodentia, Mammalia) from the Junggar Basin of northwestern China demonstrate early radiation among squirrels and suggest forested paleoenvironment in the late Eocene of Central Asia".FRONTIERS IN EARTH SCIENCE 10(2023):13.

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来源：古脊椎动物与古人类研究所

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