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一个特里亚斯时代的类爬行动物的起源
Ricardo N Martínez1, Tiago R Simões2,3, Gabriela Sobral4
1Instituto y Museo de Ciencias Naturales, Centro de Investigaciones de la Geósfera y la Biósfera, Universidad Nacional de San Juan, San Juan, Argentina. martinez@unsj.edu.ar.
Nature
|August 26, 2021
概括
在阿根廷发现的Taytalura alcoberi揭示了最早的类爬行动物,揭示了早期的类进化. 这一发现表明,类的关键特征起源于更早的时期,而类动物在三叠纪时期更为普遍.
科学领域:
- 古生物学
- 进化生物学
- 脊椎动物学
背景情况:
- 类爬行动物的早期进化显示了类爬行动物和类爬行动物之间的巨大知识差距.
- 早期的类动物 (,蛇,) 的化石记录很少,只有很少的不确定的化石,主要来自欧洲.
研究的目的:
- 报告发现了一种新的爬行动物化石,
- 确定T. alcoberi在虫爬行动物中的基因位置及其对Lepidosauromorph进化的影响.
主要方法:
- 使用各种数据类型和最佳性标准进行基因组学分析.
- 化石头骨的微型计算机断层扫描 (CT) 以揭示内部和外部解剖细节.
主要成果:
- 泰塔鲁拉·阿尔科贝里 (Taytalura alcoberi) 被认为是南美洲发现的最早的进化型类动物.
- 电脑扫描显示,以前被认为是牙动物特有的特征实际上起源于较早的类动物进化.
- 这项研究表明,虫的骨结构是所有类动物的形形态 (祖先).
结论:
- 发现Taytalura alcoberi显著增强了我们对早期类动物进化和头骨形态的理解.
- 这表明三叠纪时期的茎状和冠状类动物共存,而早期的类动物的地理分布比之前所认为的更广.
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