一个卡尔尼亚类热足动物,其特征出乎意料地源自第一个恐龙辐射期间的特征
Ricardo N Martínez1, Carina E Colombi2,3, Martín D Ezcurra4,5
1Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, San Juan, Argentina. martinez@unsj.edu.ar.
Nature ecology & evolution
|October 14, 2025
概括
早期的恐龙多样化显示出比以前所知的更高的多样性,包括像Anteavis crurilongus这样的新物种. 这种多样化受到卡尔尼亚时代气候变化的影响.
科学领域:
- 古生物学的古生物学
- 脊椎动物古生物学 脊椎动物古生物学
- 在平流体学上,平流体学是平流体学.
背景情况:
- 恐龙在陆地生态系统中的主导地位始于三叠纪/罗纪的边界 (约1.02亿年前).
- 了解早期恐龙的多样化是中生代生态系统建立的关键.
- 卡尔尼亚时代 (大约233-227亿年前) 的有限的连续化石数据阻碍了对最初的恐龙多样化的理解.
研究的目的:
- 用新的化石数据调查恐龙的早期多样化.
- 为了分析Ischigualasto形成中的恐龙多样性和丰富性.
- 了解气候变化对早期恐龙动物群的影响.
主要方法:
- 从石基瓜拉斯托 (Ischigualasto) 形成 (231.4-225.9亿年前) 的地层学上几乎连续的化石记录的分析.
- 新种类的描述,包括Anteavis crurilongus gen. et sp. 的描述. 在新的一年里.
- 脊椎动物组合的古生物学分析,以评估恐龙的多样性和丰富性.
主要成果:
- 在Ischigualasto形成的恐龙的多样性和丰富性比以前被认为的要高.
- 发现了Anteavis crurilongus,这是一种具有原始特征的早期分离的热足动物,表明了小型至中型恐龙的显著多样性.
- 多样化发生在转向半干旱条件的过程中,随后恐龙记录中出现了一个差距,并恢复到潮湿条件.
结论:
- 早期恐龙的多样化很可能是气候驱动的动物周转.
- 伊斯奇古拉斯托形成提供了关键的洞察力,了解卡尔尼亚纪晚期恐龙的进化.
- 随后在中期诺里亚的复苏显示了体型较大的恐龙物种,表明了显著的进化变化.
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