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

doi:10.1080/02724634.2021.1938099

IVPP-IR > 中科院古脊椎所（2000年以后）

	New species of Yuomys (Rodentia, Ctenodactyloidea) from the upper Eocene of eastern Ningxia, China
	Gong, Hao 1,2; Li, Qiang1,2,3 ; Ni, Xijun1,2,3
	2021-08-03
发表期刊	JOURNAL OF VERTEBRATE PALEONTOLOGY
ISSN	0272-4634
卷号	34 期号:7 页码:9
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.
DOI	10.1080/02724634.2021.1938099
关键词[WOS]	MAMMALIAN FAUNA ; BODY-MASS ; RUMINANTIA ; BASIN ; AREA
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDA20070203] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26030304] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0705]
WOS研究方向	Paleontology
WOS类目	Paleontology
WOS记录号	WOS:000680747100001
出版者	TAYLOR & FRANCIS INC
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/18192
专题	中科院古脊椎所（2000年以后）
通讯作者	Gong, Hao
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Life & Paleoenvironm, 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,2021,34(7):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,34(7),9.
MLA	Gong, Hao,et al."New species of Yuomys (Rodentia, Ctenodactyloidea) from the upper Eocene of eastern Ningxia, China".JOURNAL OF VERTEBRATE PALEONTOLOGY 34.7(2021):9.

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