部形态学澄清了皇冠鸟类起源附近的家族遗传关系
Abi H Crane1,2, Juan Benito3, Albert Chen3
1Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom. a.crane@soton.ac.uk.
BMC ecology and evolution
|December 25, 2025
概括
化石鸟分析显示,阿斯泰里奥尼斯与形动物有亲缘关系,而不是古类动物. 这项研究强调了下.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 比较解剖学的比较解剖学
背景情况:
- 由于化石证据有限,早期鸟类的家族遗传关系仍在争论中.
- 鸟类下 (下) 包含有价值的遗传学数据,但元素融合阻碍了分析.
- 高分辨率成像可以克服融合,揭示详细的下形态.
研究的目的:
- 为了研究鸟类下内的遗传信号.
- 解决鸟类王冠群的起源附近化石鸟类的亲缘关系.
- 使用微型计算机断层扫描 (μCT) 扫描来分析下元素.
主要方法:
- 高分辨率的μCT扫描不成熟的王冠鸟和化石下.
- 分离和分析后牙复合体的个别骨元素.
- 进行比较分析以评估遗传学假设.
主要成果:
- 阿斯蒂奥里尼斯表现出下相似之处,支持galloanseran (特别是galliform) 的亲和关系,反驳了古怪的联系.
- Ichthyornis,Pelagornithidae和Vegavis表现出类似的下架构,这质疑了它们的家族遗传位置.
- 缺少将这些分类与Galloanserae联系起来的衍生特征.
结论:
- 部形态学为早期鸟类进化提供了关键的见解.
- 这项研究解决了Asteriornis的亲和关系,并提出了关于其他化石种类的新问题.
- 对下牙后复合物的详细比较研究提供了尚未开发的遗传学价值.
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