| Insight into the early evolution of the avian sternum from juvenile enantiornithines | |
| Zheng, Xiaoting; Wang, Xiaoli; O'Connor, Jingmai; Zhou, Zhonghe; jingmai.oconnor@gmail.com | |
| 2012 | |
| 关键词 | Ossification Sequence Bone Microstructure Birds China Phylogeny Skeleton Theropoda Anatomy Growth Fowl |
| 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. |
| 页数 | 0—0 |
| URL | 查看原文 |
| 文献类型 | 学位论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/4253 |
| 专题 | 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. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| Insight into the ear（984KB） | 开放获取 | -- | 请求全文 | |||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论