The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs
文献类型：期刊论文
| 作者 | Sullivan, Corwin; Hone, David W. E.; Xu, Xing; Zhang, Fucheng; csullivan@ivpp.ac.cn |
| 刊名 | PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
 |
| 出版日期 | 2010-07-07 |
| 卷号 | 277期号:1690页码:2027-2033 |
| 关键词 | Theropoda Maniraptora Aves Carpus Radiale Feathers |
| ISSN号 | 0962-8452 |
| 文献子类 | Article |
| 英文摘要 | In extant birds, the hand is permanently abducted towards the ulna, and the wrist joint can bend extensively in this direction to fold the wing when not in use. Anatomically, this asymmetric mobility of the wrist results from the wedge-like shape of one carpal bone, the radiale, and from the well-developed convexity of the trochlea at the proximal end of the carpometacarpus. Among the theropod precursors of birds, a strongly convex trochlea is characteristic of Coelurosauria, a clade including the highly derived Maniraptora in addition to tyrannosaurs and compsognathids. The shape of the radiale can be quantified using a 'radiale angle' between the proximal and distal articular surfaces. Measurement of the radiale angle and reconstruction of ancestral states using squared-change parsimony shows that the angle was small (15 degrees) in primitive coelurosaurs but considerably larger (25 degrees) in primitive maniraptorans, indicating that the radiale was more wedge-shaped and the carpal joint more asymmetric. The radiale angle progressively increased still further within Maniraptora, with concurrent elongation of the forelimb feathers and the forelimb itself. Carpal asymmetry would have permitted avian-like folding of the forelimb in order to protect the plumage, an early advantage of the flexible, asymmetric wrist inherited by birds. |
| URL标识 | 查看原文 |
| WOS关键词 | CHINA ; FLIGHT ; OSTEOLOGY ; FEATHERS ; FORELIMB ; ELEMENTS ; WRIST |
| WOS研究方向 | Life Sciences & Biomedicine - Other Topics ; Environmental Sciences & Ecology ; Evolutionary Biology |
| 语种 | 英语 |
| WOS记录号 | WOS:000278056400011 |
| 公开日期 | 2013-11-27 |
| 源URL | [http://119.78.100.205/handle/311034/4548]  |
| 专题 | 古脊椎动物与古人类研究所_图书馆1 |
| 通讯作者 | csullivan@ivpp.ac.cn |
| 作者单位 | Chinese Acad Sci, Inst Vertebrate Palaeontol & Palaeoanthropol, Key Lab Evolutionary Systemat Vertebrates, Beijing 100044, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sullivan, Corwin,Hone, David W. E.,Xu, Xing,et al. The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs[J]. PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES,2010,277(1690):2027-2033. |
| APA | Sullivan, Corwin,Hone, David W. E.,Xu, Xing,Zhang, Fucheng,&csullivan@ivpp.ac.cn.(2010).The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs.PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES,277(1690),2027-2033. |
| MLA | Sullivan, Corwin,et al."The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs".PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES 277.1690(2010):2027-2033. |
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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