An ancestral turtle from the Late Triassic of southwestern China

IVPP-IR > 中科院古脊椎所（2000年以后）

	An ancestral turtle from the Late Triassic of southwestern China
	Li, Chun1 ; Wu, Xiao-Chun2 ; Rieppel, Olivier 3; Wang, Li-Ting 4; Zhao, Li-Jun 5; [email protected]
	2008-11-27
发表期刊	NATURE
ISSN	0028-0836
卷号	456 期号:7221 页码:497-501
文章类型	Article
摘要	The origin of the turtle body plan remains one of the great mysteries of reptile evolution. The anatomy of turtles is highly derived, which renders it difficult to establish the relationships of turtles with other groups of reptiles. The oldest known turtle, Proganochelys from the Late Triassic period of Germany(1), has a fully formed shell and offers no clue as to its origin. Here we describe a new 220- million- year- old turtle from China, somewhat older than Proganochelys, that documents an intermediate step in the evolution of the shell and associated structures. A ventral plastron is fully developed, but the dorsal carapace consists of neural plates only. The dorsal ribs are expanded, and osteoderms are absent. The new species shows that the plastron evolved before the carapace and that the first step of carapace formation is the ossification of the neural plates coupled with a broadening of the ribs. This corresponds to early embryonic stages of carapace formation in extant turtles, and shows that the turtle shell is not derived from a fusion of osteoderms. Phylogenetic analysis places the new species basal to all known turtles, fossil and extant. The marine deposits that yielded the fossils indicate that this primitive turtle inhabited marginal areas of the sea or river deltas.
关键词	Chelydra-serpentina Reptilia Origin Shell Histology Evolution Guizhou Osteoderms Area
WOS标题词	Science & Technology
URL	查看原文
关键词[WOS]	CHELYDRA-SERPENTINA REPTILIA ; ORIGIN ; SHELL ; HISTOLOGY ; EVOLUTION ; GUIZHOU ; OSTEODERMS ; AREA
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:000261170500037
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4791
专题	中科院古脊椎所（2000年以后）古低等脊椎动物研究室
通讯作者	[email protected]
作者单位	1.Chinese Acad Sci, Lab Evolut Systemat Vertebrates, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 2.Canadian Museum Nat, Ottawa, ON K1P 6P4, Canada 3.Field Museum Nat Hist, Dept Geol, Chicago, IL 60605 USA 4.Geol Survey Guizhou Prov, Guiyang 550005, Peoples R China 5.Zhejiang Museum Nat Hist, Hangzhou 310012, Peoples R China
推荐引用方式 GB/T 7714	Li, Chun,Wu, Xiao-Chun,Rieppel, Olivier,et al. An ancestral turtle from the Late Triassic of southwestern China[J]. NATURE,2008,456(7221):497-501.
APA	Li, Chun,Wu, Xiao-Chun,Rieppel, Olivier,Wang, Li-Ting,Zhao, Li-Jun,[email protected].(2008).An ancestral turtle from the Late Triassic of southwestern China.NATURE,456(7221),497-501.
MLA	Li, Chun,et al."An ancestral turtle from the Late Triassic of southwestern China".NATURE 456.7221(2008):497-501.

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