Insight into the early evolution of the avian sternum from juvenile enantiornithines
文献类型：学位论文
| 作者 | Zheng, Xiaoting; Wang, Xiaoli; O'Connor, Jingmai; Zhou, Zhonghe; jingmai.oconnor@gmail.com |
| 答辩日期 | 2012 |
| ISSN号 | 2041-1723 |
| 关键词 | Ossification Sequence Bone Microstructure Birds China Phylogeny Skeleton Theropoda Anatomy Growth Fowl |
| 卷号 | 3 |
| 英文摘要 | The sternum is one of the most important and characteristic skeletal elements in living birds, highly adapted for flight and showing a diverse range of morphologies. New exceptional material of young juvenile specimens from the Early Cretaceous Jehol Group in northeastern China reveals the unique sequence of development in the sternum of Enantiornithes, the dominant clade of Cretaceous birds. We recognize six ossifications that together form the sternum, three of which were previously unknown. Here we show that although basal living birds apparently have retained the dinosaurian condition in which the sternum develops from a bilateral pair of ossifications ( present in paravian dinosaurs and basal birds), the enantiornithine sternal body primarily develops from two unilateral proximo-distally arranged ossifications. This indicates that although superficially similar, the sternum formed very differently in enantiornithines and ornithuromorphs, suggesting that several ornithothoracine sternal features may represent parallelism. This highlights the importance of ontogenetic studies for understanding homology and the evolution of skeletal features in palaeontology. |
| 公开日期 | 2013-11-27 |
| 页码 | 0—0 |
| URL标识 | 查看原文 |
| 出处 | NAT COMMUN |
| 源URL | [http://119.78.100.205/handle/311034/4254]  |
| 专题 | 古脊椎动物与古人类研究所_古低等脊椎动物研究室 |
| 通讯作者 | jingmai.oconnor@gmail.com |
| 推荐引用方式 GB/T 7714 | Zheng, Xiaoting,Wang, Xiaoli,O'Connor, Jingmai,et al. Insight into the early evolution of the avian sternum from juvenile enantiornithines[D]. 2012. |
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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