A new troodontid (Theropoda : Troodontidae) from the Lower Cretaceous Yixian Formation of western Liaoning, China

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	A new troodontid (Theropoda : Troodontidae) from the Lower Cretaceous Yixian Formation of western Liaoning, China
	Xu, X; Wang, XL; Xu, X (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China.
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2004
卷号	78 期号:1 页码:22-26
关键词	Early Cretaceous Yixian Formation Troodontidae Western Liaoning China
ISSN号	1000-9515
文献子类	Article
英文摘要	A specimen collected from the Lower Cretaceous Yixian Formation of western Liaoning, China, represents a new genus and species of troodontid theropod. The new taxon is named and described on the basis of the holotype and the only known specimen, which comprises an articulated skeleton with the presacral vertebral, shoulder girdle and forelimbs missing as preserved. Diagnostic features of the new species include nasals that are sinusoid in lateral view, absence of a passage connecting the antorbital and maxillary fenestrae, relatively large teeth, plate-like chevrons forming a band along most of the length of the tail, and a long neck between the femoral head and shaft. The temporal constraints of the three paravian groups (Troodontidae, Dromaeosauridae and Aves) combined with the character distributions among the earliest known troodontids indicate a rapid evolution at the base of the Troodontidae.; A specimen collected from the Lower Cretaceous Yixian Formation of western Liaoning, China, represents a new genus and species of troodontid theropod. The new taxon is named and described on the basis of the holotype and the only known specimen, which comprises an articulated skeleton with the presacral vertebral, shoulder girdle and forelimbs missing as preserved. Diagnostic features of the new species include nasals that are sinusoid in lateral view, absence of a passage connecting the antorbital and maxillary fenestrae, relatively large teeth, plate-like chevrons forming a band along most of the length of the tail, and a long neck between the femoral head and shaft. The temporal constraints of the three paravian groups (Troodontidae, Dromaeosauridae and Aves) combined with the character distributions among the earliest known troodontids indicate a rapid evolution at the base of the Troodontidae.
WOS关键词	REPUBLIC-OF-CHINA ; EARLY EVOLUTION ; DINOSAUR ; MONGOLIA ; STENONYCHOSAURUS ; SPECIMEN ; ORIGIN ; BIRDS
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000221717300005
公开日期	2013-11-27
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/3678]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Xu, X (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China.
作者单位	Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Xu, X,Wang, XL,Xu, X . A new troodontid (Theropoda : Troodontidae) from the Lower Cretaceous Yixian Formation of western Liaoning, China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2004,78(1):22-26.
APA	Xu, X,Wang, XL,&Xu, X .(2004).A new troodontid (Theropoda : Troodontidae) from the Lower Cretaceous Yixian Formation of western Liaoning, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,78(1),22-26.
MLA	Xu, X,et al."A new troodontid (Theropoda : Troodontidae) from the Lower Cretaceous Yixian Formation of western Liaoning, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 78.1(2004):22-26.