The Phylogenetic Relationships of Eucynodontia (Amniota: Synapsida)

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	The Phylogenetic Relationships of Eucynodontia (Amniota: Synapsida)
	Liu, Jun1,2 ; Olsen, Paul 2; liujun@ivpp.ac.cn
	2010-09-01
发表期刊	JOURNAL OF MAMMALIAN EVOLUTION
ISSN	1064-7554
卷号	17 期号:3 页码:151-176
文章类型	Article
摘要	The phylogeny of Eucynodontia is an important topic in vertebrate paleontology and is the foundation for understanding the origin of mammals. However, consensus on the phylogeny of Eucynodontia remains elusive. To clarify their interrelationships, a cladistic analysis, based on 145 characters and 31 species, and intergrating most prior works, was performed. The monophyly of Eucynodontia is confirmed, although the results slightly differ from those of previous analyses with respect to the composition of both Cynognathia and Probainognathia. This is also the first numerical cladistic analysis to recover a monophyletic Traversodontidae. Brasilodon is the plesiomorphic sister taxon of Mammalia, although it is younger than the oldest mammals and is specialized in some characters. A monophyletic Prozostrodontia, including tritheledontids, tritylodontids, and mammals, is well supported by many characters. Pruning highly incomplete taxa generally has little effect on the inferred pattern of relationships among the more complete taxa, although exceptions sometimes occur when basal fragmentary taxa are removed. Taxon sampling of the current data matrix shows that taxon sampling was poor in some previous studies, implying that their results are not reliable. Two major unresolved questions in cynodont phylogenetics are whether tritylodontids are more closely related to mammals or to traversodontids, and whether tritylodontids or tritheledontids are closer to mammals. Analyses of possible synapomorphies support a relatively close relationship between mammals and tritylodontids, to the exclusion of traversodontids, but do not clearly indicate whether or not tritheledontids are closer to mammals than are tritylodontids.
关键词	Phylogeny Eucynodontia Tritheledontidae Tritylodontidae Traversodontidae Mammal
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
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关键词[WOS]	SOUTH-AFRICA ; NONMAMMALIAN CYNODONTS ; ORDERED CHARACTERS ; MISSING DATA ; MAMMALS ; TAXA ; THERAPSIDA ; ORIGIN ; TRANSFORMATION ; DROMATHERIUM
收录类别	SCI
语种	英语
WOS研究方向	Evolutionary Biology ; Zoology
WOS类目	Evolutionary Biology ; Zoology
WOS记录号	WOS:000279714700001
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4529
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	liujun@ivpp.ac.cn
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Evolutionary Systemat Vertebrates, Beijing 100044, Peoples R China 2.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
推荐引用方式 GB/T 7714	Liu, Jun,Olsen, Paul,liujun@ivpp.ac.cn. The Phylogenetic Relationships of Eucynodontia (Amniota: Synapsida)[J]. JOURNAL OF MAMMALIAN EVOLUTION,2010,17(3):151-176.
APA	Liu, Jun,Olsen, Paul,&liujun@ivpp.ac.cn.(2010).The Phylogenetic Relationships of Eucynodontia (Amniota: Synapsida).JOURNAL OF MAMMALIAN EVOLUTION,17(3),151-176.
MLA	Liu, Jun,et al."The Phylogenetic Relationships of Eucynodontia (Amniota: Synapsida)".JOURNAL OF MAMMALIAN EVOLUTION 17.3(2010):151-176.

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