A new Lower Cretaceous bird from China and tooth reduction in early avian evolution

IVPP-IR > 中科院古脊椎所（2000年以后）

	A new Lower Cretaceous bird from China and tooth reduction in early avian evolution
	Zhou, Zhonghe(周忠和); Li, Fucheng Zhang Zhiheng(张福成); zhonghe@yeah.net
	2010
发表期刊	P ROY SOC B-BIOL SCI
ISSN	0962-8452
卷号	277 期号:1679 页码:219—227
摘要	A new avian genus and species, Zhongjianornis yangi gen. et sp. nov., is reported from the Lower Cretaceous lacustrine deposits of the Jiufotang Formation in Liaoning, northeast China. The new taxon is characterized by possessing the following combination of features: upper and lower jaws toothless, snout pointed, humerus with large and robust deltopectoral crest, second phalanx of the major manual digit longer than the first phalanx, unguals of the alular and major digits of similar length and significantly shorter than the corresponding penultimate phalanges, tibiotarsus slender and more than twice the length of the tarsometatarsus, and metatarsal IV longer than the other metatarsals. Phylogenetic analysis indicates that Zhongjianornis is phylogenetically basal to Confuciusornis and the dominant Mesozoic avian groups, Enantiornithes and Ornithurae, and therefore provides significant new information regarding the diversification of birds in the Early Cretaceous. It also represents the most basal bird that completely lacks teeth, suggesting that tooth loss was more common than expected in early avian evolution and that the avian beak appeared independently in several avian lineages, most probably as a response to selective pressure for weight reduction. Finally, the presence of a significantly enlarged humeral deltopectoral crest suggests that Zhongjianornis shares with other basal birds such as Jeholornis, Sapeornis and Confuciusornis a distinctive mode of adaptation for flight contrasting with that seen in more advanced birds, which instead possess an elongated sternum and a prominent keel.
关键词	Enantiornithine Bird Ornithurine Bird Morphology Insight Anatomy Flight Aves
URL	查看原文
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4613
专题	中科院古脊椎所（2000年以后）
通讯作者	zhonghe@yeah.net
推荐引用方式 GB/T 7714	Zhou, Zhonghe,Li, Fucheng Zhang Zhiheng,zhonghe@yeah.net. A new Lower Cretaceous bird from China and tooth reduction in early avian evolution[J]. P ROY SOC B-BIOL SCI,2010,277(1679):219—227.
APA	Zhou, Zhonghe,Li, Fucheng Zhang Zhiheng,&zhonghe@yeah.net.(2010).A new Lower Cretaceous bird from China and tooth reduction in early avian evolution.P ROY SOC B-BIOL SCI,277(1679),219—227.
MLA	Zhou, Zhonghe,et al."A new Lower Cretaceous bird from China and tooth reduction in early avian evolution".P ROY SOC B-BIOL SCI 277.1679(2010):219—227.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
A new Lower Cretaceo（1258KB）			开放获取	--	浏览下载