Fossoriality and evolutionary development in two Cretaceous mammaliamorphs

doi:10.1038/s41586-021-03433-2

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	Fossoriality and evolutionary development in two Cretaceous mammaliamorphs
	Mao, Fangyuan 3,4,5; Zhang, Chi 4,5; Liu, Cunyu 2; Meng, Jin 1,3
刊名	NATURE
	2021-04-07
页码	21
ISSN号	0028-0836
DOI	10.1038/s41586-021-03433-2
通讯作者	Mao, Fangyuan(maofangyuan@ivpp.ac.cn) ; Meng, Jin(jmeng@amnh.org)
英文摘要	Mammaliamorpha comprises the last common ancestor of Tritylodontidae and Mammalia plus all its descendants(1). Tritylodontids are nonmammaliaform herbivorous cynodonts that originated in the Late Triassic epoch, diversified in the Jurassic period(2-5) and survived into the Early Cretaceous epoch(6,7). Eutriconodontans have generally been considered to be an extinct mammalian group, although different views exist(8). Here we report a newly discovered tritylodontid and eutriconodontan from the Early Cretaceous Jehol Biota of China. Eutriconodontans are common in this biota(9), but it was not previously known to contain tritylodontids. The two distantly related species show convergent features that are adapted for fossorial life, and are the first 'scratch-diggers' known from this biota. Both species also show an increased number of presacral vertebrae, relative to the ancestral state in synapsids or mammals(10,11), that display meristic and homeotic changes. These fossils shed light on the evolutionary development of the axial skeleton in mammaliamorphs, which has been the focus of numerous studies in vertebrate evolution(12-17)and developmental biology(18)(-)(28). The phenotypes recorded by these fossils indicate that developmental plasticity in somitogenesis and HOX gene expression in the axial skeleton-similar to that observed in extant mammals-was already in place in stem mammaliamorphs. The interaction of these developmental mechanisms with natural selection may have underpinned the diverse phenotypes of body plan that evolved independently in various clades of mammaliamorph.
资助项目	National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[42072002] ; Strategic Priority Research Program (B) of the CAS[XDB26000000] ; Youth Innovation Promotion Association, CAS[2019076] ; Kalbfleisch Fellowship, Richard Gilder Graduate School, AMNH ; 100 Young Talents Program of the CAS
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE RESEARCH
WOS记录号	WOS:000637701600004
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the CAS ; Youth Innovation Promotion Association, CAS ; Kalbfleisch Fellowship, Richard Gilder Graduate School, AMNH ; 100 Young Talents Program of the CAS
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/18541]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Mao, Fangyuan; Meng, Jin
作者单位	1.CUNY, Grad Ctr, Earth & Environm Sci, New York, NY 10016 USA 2.Beipiao Pterosaur Museum China, Beipiao, Peoples R China 3.Amer Museum Nat Hist, Div Paleontol, New York, NY 10024 USA 4.CAS Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 5.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Evolutionary Systemat Vertebrates, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Mao, Fangyuan,Zhang, Chi,Liu, Cunyu,et al. Fossoriality and evolutionary development in two Cretaceous mammaliamorphs[J]. NATURE,2021:21.
APA	Mao, Fangyuan,Zhang, Chi,Liu, Cunyu,&Meng, Jin.(2021).Fossoriality and evolutionary development in two Cretaceous mammaliamorphs.NATURE,21.
MLA	Mao, Fangyuan,et al."Fossoriality and evolutionary development in two Cretaceous mammaliamorphs".NATURE (2021):21.