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

IVPP-IR > 中科院古脊椎所（2000年以后）

	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.
	2004
发表期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN	1000-9515
卷号	78 期号:1 页码:22-26
文章类型	Article
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.
关键词	Early Cretaceous Yixian Formation Troodontidae Western Liaoning China
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	REPUBLIC-OF-CHINA ; EARLY EVOLUTION ; DINOSAUR ; MONGOLIA ; STENONYCHOSAURUS ; SPECIMEN ; ORIGIN ; BIRDS
收录类别	SCI ; ISTP
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000221717300005
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3677
专题	中科院古脊椎所（2000年以后）
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.

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