A possible long-tailed bird with a pygostyle from the Late Mesozoic Yixian Formation, Western Liaoning, China

IVPP-IR > 中科院古脊椎所（2000年以后）

	A possible long-tailed bird with a pygostyle from the Late Mesozoic Yixian Formation, Western Liaoning, China
	Lu, JC ; Hou, LH ; Lu, JC (reprint author), Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China.
	2005
发表期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN	1000-9515
卷号	79 期号:1 页码:7-10
文章类型	Article
摘要	An incomplete caudal vertebral series (IVPP V11309) from the Yixian Formation of late Mesozoic, Jianshangou area of Beipiao, western Liaoning Province, may represent a new bird. The tail is composed of at least 12 free caudal vertebrae and the most distal 5 caudal vertebrae co-ossified into a pygostyle. The pygostyle is plate-like and slightly curved dorsally. The anterior free caudals are amphiplatyan. The anterior caudal surfaces of the last three free caudals are concave, but their posterior articular surfaces are convex. The pygostyle is regarded as the first appeared flight apparatus during the evolutionary process from Archaeopteryx to neornithes. The pygostyle appeared in most early fossil birds and almost all the modern birds. Although their morphologies are different, they are basically formed by at least four last caudal vertebrae. The specimen V11309 is regarded as a bird rather than a non-avian theropod dinosaur based on the following characters: short caudal vertebrae, numerous pits present on the surfaces of the centra and, a foramen present between the basal part of the fused neural spines, which is similar to that of Struthio camelus. The discoveries of pygostyles from the therizinosauroids and oviraptorosaurs may provide strong evidence for supporting the origin of birds from small theropod dinosaurs. The structure of the pygostyle in specimen V11309 is different from those of Beipiaosaurus (Therizinosauroid) and Nomingia (oviraptorosaur). The most parsimonious interpretation is that these pygostyle-like structures are independently acquired by Beipiaosaurus and Nomingia during their evolutionary process.; An incomplete caudal vertebral series (IVPP V11309) from the Yixian Formation of late Mesozoic, Jianshangou area of Beipiao, western Liaoning Province, may represent a new bird. The tail is composed of at least 12 free caudal vertebrae and the most distal 5 caudal vertebrae co-ossified into a pygostyle. The pygostyle is plate-like and slightly curved dorsally. The anterior free caudals are amphiplatyan. The anterior caudal surfaces of the last three free caudals are concave, but their posterior articular surfaces are convex. The pygostyle is regarded as the first appeared flight apparatus during the evolutionary process from Archaeopteryx to neornithes. The pygostyle appeared in most early fossil birds and almost all the modern birds. Although their morphologies are different, they are basically formed by at least four last caudal vertebrae. The specimen V11309 is regarded as a bird rather than a non-avian theropod dinosaur based on the following characters: short caudal vertebrae, numerous pits present on the surfaces of the centra and, a foramen present between the basal part of the fused neural spines, which is similar to that of Struthio camelus. The discoveries of pygostyles from the therizinosauroids and oviraptorosaurs may provide strong evidence for supporting the origin of birds from small theropod dinosaurs. The structure of the pygostyle in specimen V11309 is different from those of Beipiaosaurus (Therizinosauroid) and Nomingia (oviraptorosaur). The most parsimonious interpretation is that these pygostyle-like structures are independently acquired by Beipiaosaurus and Nomingia during their evolutionary process.
关键词	Western Liaoning Yixian Formation Late Mesozoic Pygostyle
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	CONFUCIUSORNIS-SANCTUS ; EVOLUTION ; ENANTIORNITHINE ; OVIRAPTOROSAUR ; THEROPODA
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:000228762000002
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3573
专题	中科院古脊椎所（2000年以后）
通讯作者	Lu, JC (reprint author), Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China.
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 3.Capital Normal Univ, Dept Biol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Lu, JC,Hou, LH,Lu, JC . A possible long-tailed bird with a pygostyle from the Late Mesozoic Yixian Formation, Western Liaoning, China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2005,79(1):7-10.
APA	Lu, JC,Hou, LH,&Lu, JC .(2005).A possible long-tailed bird with a pygostyle from the Late Mesozoic Yixian Formation, Western Liaoning, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,79(1),7-10.
MLA	Lu, JC,et al."A possible long-tailed bird with a pygostyle from the Late Mesozoic Yixian Formation, Western Liaoning, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 79.1(2005):7-10.

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