The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China

IVPP-IR > 中科院古脊椎所（2000年以后）

	The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China
	Benson, Roger B. J.1; Xing, Xu 3; rbb27@cam.ac.uk
	2008-11-01
发表期刊	GEOLOGICAL MAGAZINE
ISSN	0016-7568
卷号	145 期号:6 页码:778-789
文章类型	Article
摘要	There is little consensus on the systematic position of the colossal theropod dinosaur Chilantaisaurus tashuikouensis from the Cretaceous (Aptian-?Albian or Upper Cretaceous) Ulansuhai Formation of Inner Mongolia, which has been recovered as a derived member of both Allosauroidea and Spinosauroidea by numerical phylogenetic analyses. Redescription of the type material of C. tashuikouensis reveals an unusual combination of morphological features that render determination of its systematic position problematic. It possesses anatomical features that have been proposed as synapomorphies of Neotetanurae: a preacetabular fossa on the ilium, and a wedge-shaped cross-section of the shaft of the third metatarsal. It also shares some features with specific allosauroid taxa: a pronounced ulnar epicondyle on the humerus, and a prominent medial shelf bounding the preacetabular fossa on the ilium (also present in tyrannosauroids). However, it lacks some features that are present in all other allosauroids: a marked depression on the anterior surface of the distal humerus adjacent to the ulnar condyle, and a humerus that is less than 0.4 times the length of the femur; it furthermore possesses a tibial astragalar facet that is approximately 10 % of the tibial length, which suggests a more basal position within Tetanurae. Chilantaisaurus shares certain features with some spinosauroids: an enlarged and elongated first manual ungual, and a suprastragalar buttress that has been modified to a vertical ridge, but these characters are not unique to spinosauroids. A highly reduced fourth trochanter may be an autapomorphy of Chilantaisaurus, as has previously been suggested, or unite the taxon with Coelurosauria in an entirely novel grouping. On the basis of these observations it is likely that Chilantaisaurus is a neotetanuran, but unlikely that it is an allosauroid. Chilantaisaurus may belong to an alternative lineage of very large theropods that continued into the Cretaceous from the diversification of basal neotetanurans during the Middle Jurassic.
关键词	Chilantaisaurus Theropod Dinosaur Ulansuhai Formation Cretaceous
WOS标题词	Science & Technology ; Physical Sciences
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关键词[WOS]	EVOLUTION ; ARGENTINA ; PATAGONIA
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000260918600003
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4797
专题	中科院古脊椎所（2000年以后）
通讯作者	rbb27@cam.ac.uk
作者单位	1.Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England 2.Nat Hist Museum, London SW7 5BD, England 3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Benson, Roger B. J.,Xing, Xu,rbb27@cam.ac.uk. The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China[J]. GEOLOGICAL MAGAZINE,2008,145(6):778-789.
APA	Benson, Roger B. J.,Xing, Xu,&rbb27@cam.ac.uk.(2008).The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China.GEOLOGICAL MAGAZINE,145(6),778-789.
MLA	Benson, Roger B. J.,et al."The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China".GEOLOGICAL MAGAZINE 145.6(2008):778-789.

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