A gravid lizard from the Cretaceous of China and the early history of squamate viviparity

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	A gravid lizard from the Cretaceous of China and the early history of squamate viviparity
	Wang, Yuan 2; Evans, Susan E.1; wangyuan@ivpp.ac.cn ; ucgasue@ucl.ac.uk
	2011-09-01
发表期刊	NATURWISSENSCHAFTEN
ISSN	0028-1042
卷号	98 期号:9 页码:739-743
文章类型	Article
摘要	Although viviparity is most often associated with mammals, roughly one fifth of extant squamate reptiles give birth to live young. Phylogenetic analyses indicate that the trait evolved more than 100 times within Squamata, a frequency greater than that of all other vertebrate clades combined. However, there is debate as to the antiquity of the trait and, until now, the only direct fossil evidence of squamate viviparity was in Late Cretaceous mosasauroids, specialised marine lizards without modern equivalents. Here, we document viviparity in a specimen of a more generalised lizard, Yabeinosaurus, from the Early Cretaceous of China. The gravid female contains more than 15 young at a level of skeletal development corresponding to that of late embryos of living viviparous lizards. This specimen documents the first occurrence of viviparity in a fossil reptile that was largely terrestrial in life, and extends the temporal distribution of the trait in squamates by at least 30 Ma. As Yabeinosaurus occupies a relatively basal position within crown-group squamates, it suggests that the anatomical and physiological preconditions for viviparity arose early within Squamata.
关键词	Viviparity Squamata Reptilia Cretaceous China
WOS标题词	Science & Technology
URL	查看原文
关键词[WOS]	LIVE BIRTH ; REPTILIAN VIVIPARITY ; MARINE REPTILES ; OSSIFICATION ; EVOLUTION ; PATTERNS ; SEX
收录类别	SCI
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000293969200003
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4395
专题	中科院古脊椎所（2000年以后）
通讯作者	wangyuan@ivpp.ac.cn; ucgasue@ucl.ac.uk
作者单位	1.UCL, Dept Cell & Dev Biol, London WC1E 6BT, England 2.Chinese Acad Sci, Key Lab Evolutionary Systemat Vertebrates, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yuan,Evans, Susan E.,wangyuan@ivpp.ac.cn,et al. A gravid lizard from the Cretaceous of China and the early history of squamate viviparity[J]. NATURWISSENSCHAFTEN,2011,98(9):739-743.
APA	Wang, Yuan,Evans, Susan E.,wangyuan@ivpp.ac.cn,&ucgasue@ucl.ac.uk.(2011).A gravid lizard from the Cretaceous of China and the early history of squamate viviparity.NATURWISSENSCHAFTEN,98(9),739-743.
MLA	Wang, Yuan,et al."A gravid lizard from the Cretaceous of China and the early history of squamate viviparity".NATURWISSENSCHAFTEN 98.9(2011):739-743.

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