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

文献类型：期刊论文

作者Li, Luzhou1,2; Li, Qiang1,2,3; Lu, Xiaoyu1,2; Ni, Xijun1,2,3
刊名PEERJ
出版日期2017-05-16
卷号5
关键词Xinjiang Beavers Propalaeocastor Early Oligocene Irtysh River Formation
DOI10.7717/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)
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).

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来源：古脊椎动物与古人类研究所

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