A new symmetrodont mammal from China and its implications for mammalian evolution

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	A new symmetrodont mammal from China and its implications for mammalian evolution
	Hu, YM ; Wang, YQ; Luo, ZX ; Li, CK
	1997-11-13
发表期刊	NATURE
ISSN	0028-0836
卷号	390 期号:6656 页码:137-142
文章类型	Article
摘要	A new symmetrodont mammal has been discovered in the Mesozoic era (Late Jurassic or Early Cretaceous period) of Liaoning Province, China, Archaic therian mammals, including symmetrodonts, are extinct relatives of the living marsupial and placental therians. However, these archaic therians have been mostly documented by fragmentary fossils. This new fossil taxon, represented by a nearly complete postcranial skeleton and a partial skull with dentition, is the best-preserved symmetrodont mammal yet discovered. It provides a new insight into the relationships of the major lineages of mammals and the evolution of the mammalian skeleton. Our analysis suggests that this new taxon represents a part of the early therian radiation before the divergence of living marsupials and placentals; that therians and multituberculates are more closely related to each other than either group is to other mammalian lineages; that archaic therians lacked the more parasagittal posture of the forelimb of most living therian mammals; and that archaic therians, such as symmetrodonts, retained the primitive feature of a finger-like promontorium (possibly with a straight cochlea) of the non-therian mammals. The fully coiled cochlea evolved later in more derived therian mammals, and is therefore convergent to the partially coiled cochlea of monotremes.; A new symmetrodont mammal has been discovered in the Mesozoic era (Late Jurassic or Early Cretaceous period) of Liaoning Province, China, Archaic therian mammals, including symmetrodonts, are extinct relatives of the living marsupial and placental therians. However, these archaic therians have been mostly documented by fragmentary fossils. This new fossil taxon, represented by a nearly complete postcranial skeleton and a partial skull with dentition, is the best-preserved symmetrodont mammal yet discovered. It provides a new insight into the relationships of the major lineages of mammals and the evolution of the mammalian skeleton. Our analysis suggests that this new taxon represents a part of the early therian radiation before the divergence of living marsupials and placentals; that therians and multituberculates are more closely related to each other than either group is to other mammalian lineages; that archaic therians lacked the more parasagittal posture of the forelimb of most living therian mammals; and that archaic therians, such as symmetrodonts, retained the primitive feature of a finger-like promontorium (possibly with a straight cochlea) of the non-therian mammals. The fully coiled cochlea evolved later in more derived therian mammals, and is therefore convergent to the partially coiled cochlea of monotremes.
WOS标题词	Science & Technology
关键词[WOS]	FUNCTIONAL-ANATOMY ; SHOULDER GIRDLE ; EAR
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:A1997YF49400043
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4003
专题	中科院古脊椎所（2000年以后）古低等脊椎动物研究室古哺乳动物研究室
作者单位	1.CARNEGIE MUSEUM NAT HIST, SECT VERTEBRATE PALEONTOL, PITTSBURGH, PA 15213 USA 2.CHINESE ACAD SCI, INST VERTEBRATE PALEONTOL & PALEOANTHROPOL, BEIJING 100044, PEOPLES R CHINA
推荐引用方式 GB/T 7714	Hu, YM,Wang, YQ,Luo, ZX,et al. A new symmetrodont mammal from China and its implications for mammalian evolution[J]. NATURE,1997,390(6656):137-142.
APA	Hu, YM,Wang, YQ,Luo, ZX,&Li, CK.(1997).A new symmetrodont mammal from China and its implications for mammalian evolution.NATURE,390(6656),137-142.
MLA	Hu, YM,et al."A new symmetrodont mammal from China and its implications for mammalian evolution".NATURE 390.6656(1997):137-142.

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