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

doi:10.3389/feart.2022.1004509

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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
	Li, Qiang1,2,3 ; Ni, Xijun1,2,3 ; Stidham, Thomas A.1,2,3; Qin, Chao 1,3; Gong, Hao 1,3; Zhang, Limin 1,3
	2023-01-12
发表期刊	FRONTIERS IN EARTH SCIENCE
卷号	10 期号:0 页码:13
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.
关键词	body mass forest paleohabitat Junggar Basin late Eocene morphotype Sciuridae
DOI	10.3389/feart.2022.1004509
关键词[WOS]	TIBETAN PLATEAU ; BODY-MASS ; OLIGOCENE TRANSITION ; SCIURIDAE RODENTIA ; FLYING SQUIRRELS ; FAUNA ; ARIDIFICATION ; CLIMATE ; BIOSTRATIGRAPHY ; PHYLOGENY
收录类别	SCI
语种	英语
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
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000922813800001
出版者	FRONTIERS MEDIA SA
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/22280
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.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China 2.CAS Ctr Excellence Life & Paleoenvironment, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, 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(0):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(0),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 10.0(2023):13.

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