anewbasalbeakedornithurinebirdfromthelowercretaceousofwesternliaoningchina
文献类型：期刊论文
| 作者 | Zhou Shuang; Zhou Zhonghe ; OConnor Jingmai K
|
| 刊名 | 古脊椎动物学报
 |
| 出版日期 | 2012 |
| 卷号 | 50期号:1页码:9 |
| ISSN号 | 1000-3118 |
| 英文摘要 | 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 |
| 源URL | [http://119.78.100.205/handle/311034/15067]  |
| 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 |
| 推荐引用方式 GB/T 7714 | Zhou Shuang,Zhou Zhonghe,OConnor Jingmai K. anewbasalbeakedornithurinebirdfromthelowercretaceousofwesternliaoningchina[J]. 古脊椎动物学报,2012,50(1):9. |
| APA | Zhou Shuang,Zhou Zhonghe,&OConnor Jingmai K.(2012).anewbasalbeakedornithurinebirdfromthelowercretaceousofwesternliaoningchina.古脊椎动物学报,50(1),9. |
| MLA | Zhou Shuang,et al."anewbasalbeakedornithurinebirdfromthelowercretaceousofwesternliaoningchina".古脊椎动物学报 50.1(2012):9. |
入库方式： OAI收割
来源：古脊椎动物与古人类研究所
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