一种新的蒙古暴龙和Eutyrannosauria的演变
Jared T Voris1, Darla K Zelenitsky2, Yoshitsugu Kobayashi3
1Department of Earth, Energy and Environment, University of Calgary, Calgary, Alberta, Canada. jared.voris@ucalgary.ca.
Nature
|June 11, 2025
概括
一个新的恐龙,Khankhuuluu mongoliensis, 揭示了大型捕食恐龙的进化过程. 这一发现揭示了亚洲类动物如何扩散到北美,
科学领域:
- 古生物学
- 进化生物学
- 脊椎动物学
背景情况:
- 在亚洲和北美的白纪晚期,尤提拉诺龙是主要的大型捕食者.
- 由于化石证据有限,人们对 eutyrannosaurians 从体型较小的 tyrannosauroids 的起源知之甚少.
- 之前的理解表明阿里奥拉米尼是eutyrannosaurians中的基层血统.
研究的目的:
- 描述一个新型的恐龙, 蒙古的Khankhuuluu mongoliensis.
- 提供有关 eutyrannosaurian 恐龙起源和演变的新见解.
- 重新评估阿里奥拉米尼的遗传位置及其与龙的进化关系.
主要方法:
- 使用形态数据进行了基因分析.
- 考察了来自上白纪下层沉积物的Khankhuuluu mongoliensis化石遗骸.
- 使用比较解剖学来分析形态和身体的优雅性.
主要成果:
- 汉克鲁鲁蒙古人群位于欧特拉诺类的外面,可以看到早期的类动物进化.
- 泰拉诺类和阿里奥拉米类被确定为欧泰拉诺类中高度衍生的姐妹类.
- 阿里奥拉米尼表现出幼态特征 (保留青少年特征),挑战其以前的基底血统分类.
- 亚洲类恐龙散落到北美,导致欧恐龙起源于白纪中期.
- 阿里奥拉米尼和龙之间的形态差异与明显的异常趋势 (paedomorphosis和peramorphosis) 相关,使得区分成为可能.
结论:
- Khankhuuluu mongoliensis提供了关于eutyrannosaurians早期演变的重要数据.
- 异构性,特别是阿里奥拉米尼的足形和其他类型的形,在它们的多样化中发挥了重要作用.
- 这项研究完善了类动物的生物地理史,包括亚洲和北美之间的分散事件.
- 了解这些进化机制可以解释不同类型龙的共存和生态上的成功.
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