一个亚南极的reigitheriid和这些神秘的中生代哺乳动物中碎牙的进化
Hans P Püschel1,2,3, Agustin G Martinelli1,4, Sergio Soto-Acuña1,2,3
1Millennium Nucleus Early Evolutionary Transitions of Mammals, Santiago, Chile.
Proceedings. Biological sciences
|August 5, 2025
概括
在智利发现的一种新的哺乳动物,Yeutherium压力,扩大了已知的中生纪冈多瓦纳哺乳动物的多样性. 这一发现揭示了神秘的Reigitheriidae家族独特的粉碎牙和演变.
科学领域:
- 古生物学的古生物学
- 脊椎动物动物学 脊椎动物动物学
- 进化生物学 进化生物学
背景情况:
- 来自冈德瓦纳的中生代哺乳动物的了解很少,化石证据有限.
- 南美家族Reigitheriidae只从孤立的牙中知道,主要是Reigitherium.
- 以前的理解表明,与劳拉西亚形态相比,冈多瓦纳哺乳动物存在明显的多样性.
研究的目的:
- 描述一个新的哺乳动物分类,Yeutherium压力,代表Reigitheriidae家族的第二个已知的成员.
- 为了分析在冈多瓦纳哺乳动物中Yeutherium压力体的遗传关系.
- 根据新的化石证据,定义Reigitheriidae家族的关键特征.
主要方法:
- 一种新的化石哺乳动物的描述,基于一个带有上的部分上.
- 使用和贝叶斯方法进行的家族遗传学分析.
- 牙特征的比较形态分析.牙特征的比较形态分析.
主要成果:
- 发现了Yeutherium压力器gen. et sp. 的发现. 从晚白纪多罗泰亚形成,智利.
- 遗传学分析证实了yeutherium和reigitherium之间的密切关系,支持了reigitheriidae家族.
- 识别共享的牙特征 (preparacristae,postparacristae,舌环,根际峰,质凸) 定义了Reigitheriidae.
- 尤瑟的明显的状形态和带状的发育表明,在Reigitheriidae中,压碎适应的独立进化.
- 建议对Reigitheriidae的牙科配方进行重新解释.
结论:
- 尤瑟压力器的发现强调了Reigitheriidae的专用牙作为一个重要的功能创新.
- 这一发现有助于越来越多地了解在中生代期间Gondwanan哺乳动物辐射.
- 叶体压力器扩大了我们对南半球哺乳动物多样性和进化的知识.
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