New species of Yuomys (Rodentia, Ctenodactyloidea) from the upper Eocene of eastern Ningxia, China

doi:10.1080/02724634.2021.1938099

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	New species of Yuomys (Rodentia, Ctenodactyloidea) from the upper Eocene of eastern Ningxia, China
	Gong, Hao 2,3; Li, Qiang 1,2,3; Ni, Xijun 1,2,3
刊名	JOURNAL OF VERTEBRATE PALEONTOLOGY
	2021-08-03
页码	9
ISSN号	0272-4634
DOI	10.1080/02724634.2021.1938099
通讯作者	Gong, Hao()
英文摘要	A new species, Yuomys robustus of the ctenodactyloid rodent Yuomys, is described in the paper. It is from the Western margin of the Ordos Basin District in eastern Ningxia Hui Autonomous Region, China. Yuomys robustus is characterized by a combination of features: large size, high tooth crown, having a postparacrista on M2 and lacking hypocone on P4. We also emended the diagnosis of type species of Yuomys, Y. cavioides. It is characterized by the absence of hypocone on P4, having a distinct ridge connecting the metaconule to the protocone on M1-M3, a postparacrista on M1, a mesostyle on M2, and a small ridge or spur on the mesial side of the protoloph on P4 and M1; the hypoconid smaller than the protoconid and is elongated, the paraconid absent and the mesostylid faintly visible on p4, but well developed on m1-m3; the talonid basin, sinusid, and posteroflexid are large and open on lower cheek teeth. The occurrence of Lophiomeryx angarae in the same stratigraphic layer as Y. robustus indicates that the horizon is possibly late Eocene in age, not early Oligocene as suggested by previous workers. Body mass estimations of Y. cavioides, Y. eleganes, and Y. robustus show that their weights are roughly in the range of 485-880 g, which is in between those of extant Myospalax and Ratufa. From the middle Eocene to the late Eocene, Yuomys exhibited a trend of gradually enlarging the cheek teeth, and increasing the tooth crown height and body mass.
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDB26030304] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20070203] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0705]
WOS关键词	MAMMALIAN FAUNA ; BODY-MASS ; RUMINANTIA ; BASIN ; AREA
WOS研究方向	Paleontology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000680747100001
资助机构	Strategic Priority Research Program of Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/18191]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Gong, Hao
作者单位	1.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Gong, Hao,Li, Qiang,Ni, Xijun. New species of Yuomys (Rodentia, Ctenodactyloidea) from the upper Eocene of eastern Ningxia, China[J]. JOURNAL OF VERTEBRATE PALEONTOLOGY,2021:9.
APA	Gong, Hao,Li, Qiang,&Ni, Xijun.(2021).New species of Yuomys (Rodentia, Ctenodactyloidea) from the upper Eocene of eastern Ningxia, China.JOURNAL OF VERTEBRATE PALEONTOLOGY,9.
MLA	Gong, Hao,et al."New species of Yuomys (Rodentia, Ctenodactyloidea) from the upper Eocene of eastern Ningxia, China".JOURNAL OF VERTEBRATE PALEONTOLOGY (2021):9.