Systematics of putative euparkeriids (Diapsida: Archosauriformes) from the Triassic of China

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	Systematics of putative euparkeriids (Diapsida: Archosauriformes) from the Triassic of China
	Sookias, Roland B.1,2; Sullivan, Corwin 3; Liu, Jun3 ; Butler, Richard J.1,2
	2014-11-25
发表期刊	PEERJ
卷号	2 期号:000 页码:37
文章类型	Article
摘要	The South African species Euparkeria capensis is of great importance for understanding the early radiation of archosauromorphs (including archosaurs) following the Permo-Triassic mass extinction, as most phylogenetic analyses place it as the sister taxon to crown group Archosauria within the clade Archosauriformes. Although a number of species from Lower-Middle Triassic deposits worldwide have been referred to the putative clade Euparkeriidae, the monophyly of Euparkeriidae is controversial and has yet to be demonstrated by quantitative phylogenetic analysis. Three Chinese taxa have been recently suggested to be euparkeriids: Halazhaisuchus qiaoensis, `Turfanosuchus shageduensis', and Wangisuchus tzeyii, all three of which were collected from the Middle Triassic Ermaying Formation of northern China. Here, we reassess the taxonomy and systematics of these taxa. We regard Wangisuchus tzeyii as a nomen dubium, because the holotype is undiagnostic and there is no convincing evidence that the previously referred additional specimens represent the same taxon as the holotype. We also regard `Turfanosuchus shageduensis' as a nomen dubium as we are unable to identify any diagnostic features. We refer the holotype to Archosauriformes, and more tentatively to Euparkeriidae. Halazhaisuchus qiaoensis and the holotype of `Turfanosuchus shageduensis' are resolved as sister taxa in a phylogenetic analysis, and are in turn the sister taxon to Euparkeria capensis, forming a monophyletic Euparkeriidae that is the sister to Archosauria+Phytosauria. This is the first quantitative phylogenetic analysis to recover a non-monospecific, monophyletic Euparkeriidae, but euparkeriid monophyly is only weakly supported and will require additional examination. Given their similar sizes, stratigraphic positions and phylogenetic placement, the holotype of `Turfanosuchus shageduensis' may represent a second individual of Halazhaisuchus qiaoensis, but no apomorphies or unique character combination can be identified to unambiguously unite the two. Our results have important implications for understanding the species richness and palaeobiogeographical distribution of early archosauriforms.
关键词	Euparkeriidae Archosauriformes China Triassic Euparkeria
WOS标题词	Science & Technology
关键词[WOS]	EXTANT BIRDS NEORNITHES ; PHYLOGENETIC-RELATIONSHIPS ; BASAL ARCHOSAURIFORM ; SOFT-TISSUES ; SOUTH-AFRICA ; EVOLUTION ; DINOSAURS ; OSTEOLOGY ; ORIGIN ; REDESCRIPTION
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:000347626900001
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/7404
专题	古低等脊椎动物研究室
作者单位	1.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England 2.Univ Munich, GeoBioctr, Munich, Germany 3.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Sookias, Roland B.,Sullivan, Corwin,Liu, Jun,et al. Systematics of putative euparkeriids (Diapsida: Archosauriformes) from the Triassic of China[J]. PEERJ,2014,2(000):37.
APA	Sookias, Roland B.,Sullivan, Corwin,Liu, Jun,&Butler, Richard J..(2014).Systematics of putative euparkeriids (Diapsida: Archosauriformes) from the Triassic of China.PEERJ,2(000),37.
MLA	Sookias, Roland B.,et al."Systematics of putative euparkeriids (Diapsida: Archosauriformes) from the Triassic of China".PEERJ 2.000(2014):37.

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