A NEW BASAL BEAKED ORNITHURINE BIRD FROM THE LOWER CRETACEOUS OF WESTERN LIAONING, CHINA

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	A NEW BASAL BEAKED ORNITHURINE BIRD FROM THE LOWER CRETACEOUS OF WESTERN LIAONING, CHINA
	Zhou Shuang; Zhou Zhonghe; OConnor Jingmai K
	2012
发表期刊	古脊椎动物学报
ISSN	1000-3118
卷号	50 期号:1 页码:9
摘要	We report a new species of basal ornithurine bird,Schizooura lii gen.et sp.nov.,based on a well-preserved specimen from the Lower Cretaceous Jiufotang Formation in Jianchang,western Liao-ning,China.Phylogenetic analysis indicates that it is more derived than Jianchangornis and Archaeorhynchus,but more basal than all other known Jehol ornithurines.The new specimen preserves a unique suite of characters that differentiate it from other known taxa,including several features previously unreported in Early Cretaceous ornithurines,including a V-shaped furcula with a short hypocleidium,a rostrocaudally elongate unperforated sternum with deep caudal notches absent,and a deltopectoral crest that extends for half the length of the humerus.The specimen preserves a nearly perfectly articulated skull that indicates the species was beaked and preserves details of the skull anatomy such as the premaxilla-frontal articulation.The most notable feature of this new specimen is the preservation of a feathered tail morphology previously unknown among Mesozoic birds.It is the second tail morphology known among early ornithurines,which have until now only preserved fan-shaped tails.The new specimen preserves a forked tail composed of elongate rectrices medially separated by a deep notch.This tail feather morphology in modern birds decreases aerodynamic efficiency relative to the fan-shaped tail,but increases chance of sexual reproduction.This discovery suggests that this tradeoff convergently evolved in basal members of Ornithurae,and is consistent with the wooded environment inferred for the Jehol.
语种	英语
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/15068
专题	中国科学院古脊椎动物与古人类研究所
作者单位	中国科学院古脊椎动物与古人类研究所
第一作者单位	中国科学院古脊椎动物与古人类研究所
推荐引用方式 GB/T 7714	Zhou Shuang,Zhou Zhonghe,OConnor Jingmai K. A NEW BASAL BEAKED ORNITHURINE BIRD FROM THE LOWER CRETACEOUS OF WESTERN LIAONING, CHINA[J]. 古脊椎动物学报,2012,50(1):9.
APA	Zhou Shuang,Zhou Zhonghe,&OConnor Jingmai K.(2012).A NEW BASAL BEAKED ORNITHURINE BIRD FROM THE LOWER CRETACEOUS OF WESTERN LIAONING, CHINA.古脊椎动物学报,50(1),9.
MLA	Zhou Shuang,et al."A NEW BASAL BEAKED ORNITHURINE BIRD FROM THE LOWER CRETACEOUS OF WESTERN LIAONING, CHINA".古脊椎动物学报 50.1(2012):9.

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