Morphology of an Early Oligocene beaver Propalaeocastor irtyshensis and the status of the genus Propalaeocastor

doi:10.7717/peerj.3311

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	Morphology of an Early Oligocene beaver Propalaeocastor irtyshensis and the status of the genus Propalaeocastor
	Li, Luzhou 1,2; Li, Qiang 1,2,3; Lu, Xiaoyu 1,2; Ni, Xijun 1,2,3
刊名	PEERJ
	2017-05-16
卷号	5
关键词	Xinjiang Beavers Propalaeocastor Early Oligocene Irtysh River Formation
DOI	10.7717/peerj.3311
文献子类	Article
英文摘要	The Early to Late Oligocene Propalaeocastor is the earliest known beaver genus from Eurasia. Although many species of this genus have been described, these species are defined based on very fragmentary specimens. Propalaeocastor irtyshensis from the Early Oligocene Irtysh River Formation in northwestern Xinjiang, China is one of the earliest-known members of Propalaeocastor. This species is defined on a single maxillary fragment. We revise the diagnosis of P. irtyshensis and the genus Propalaeocastor, based on newly discovered specimens from the Irtysh River Formation. The dental morphology of P. irtyshensis is very similar to other early castorids. The caudal palatine foramen of P. irtyshensis is situated in the maxillary-palatine suture. This is a feature generally accept as diagnostic character for the castorids. On the other hand, P. irtyshensis has two upper premolars, a rudimentarily developed sciuromorph-like zygomatic plate, and a relatively large protrogomorph-like infraorbital foramen. Some previous researchers suggested that Propalaeocastor is a junior synonym of Steneofiber, while other took it as a valid genus. Our morphological comparison and phylogenetic analysis suggest that Propalaeocastor differs from Steneofiber and is a valid genus. We also suggest that Agnotocastor aubekerovi, A. coloradensis, A. galushai, A. readingi, Oligotheriomys primus, and Steneofiber aff. dehmi should be referred to Propalaeocastor. Propalaeocastor is the earliest and most basal beaver. The origin place of Propalaeocastor and castorids is uncertain. The Early Oligocene radiation of castorids probably is propelled by the global climate change during the Eocene-Oligocene transition.
WOS关键词	MIDDLE OLIGOCENE ; NUCLEAR GENES ; LATE EOCENE ; RODENTIA ; CASTORIDAE ; PHYLOGENY ; EVOLUTION ; MAMMALS ; SYSTEMATICS ; XINJIANG
WOS研究方向	Science & Technology - Other Topics
语种	英语
WOS记录号	WOS:000401844200010
资助机构	Strategic Priority Research Program of Chinese Academy of Sciences (CAS)(XDB03020000) ; National Basic Research Program of China(2012CB821904) ; CAS 100-talent Program ; National Natural Science Foundation of China(41472025 ; 41472002)
内容类型	期刊论文
源URL	[http://124.16.247.212/handle/311034/7570]
专题	古脊椎动物与古人类研究所_图书馆1
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Luzhou,Li, Qiang,Lu, Xiaoyu,et al. Morphology of an Early Oligocene beaver Propalaeocastor irtyshensis and the status of the genus Propalaeocastor[J]. PEERJ,2017,5.
APA	Li, Luzhou,Li, Qiang,Lu, Xiaoyu,&Ni, Xijun.(2017).Morphology of an Early Oligocene beaver Propalaeocastor irtyshensis and the status of the genus Propalaeocastor.PEERJ,5.
MLA	Li, Luzhou,et al."Morphology of an Early Oligocene beaver Propalaeocastor irtyshensis and the status of the genus Propalaeocastor".PEERJ 5(2017).