最早的周周动植物 (perissodactyls) 揭示了在PETM期间的大规模分散
Jérémy Tissier1,2,3, Thierry Smith1,4
1Directorate Earth and History of life, Royal Belgian Institute of Natural Sciences, Brussels 1000, Belgium.
概括
早期的甲动物,或奇爪动物,在北半球迅速多样化. 新的遗传学分析揭示了比以前想象的更少的属性,并表明这个哺乳动物群体的印度-巴基斯坦起源.
科学领域:
- 古生物学的古生物学
- 哺乳动物进化 哺乳动物进化
- 人类遗传学 是一个学科.
背景情况:
- 太古时代的虫多样化,但现在很少见.
- 由于化石证据有限,人们对它们的早期进化和多样化知之甚少.
- 现有的分类表明了复杂的早期多样化模式.
研究的目的:
- 为了研究虫的早期进化和多样化.
- 为了创建一个新的,扩展的早期perissodactyl物种的族系.
- 为了澄清早期perissodactyl属的分类学地位和关系.
主要方法:
- 对一组新数据集的分析,该数据集涵盖了早期的百里索达克提类物种.
- 构建一个庞大的家族遗传树.
- 化石种类的比较分析和形态观测.
主要成果:
- 几种先前公认的早期perissodactyls的属是同义词,减少了估计的属数.
- 属 *Pliolophus* 和 *Cardiolophus* 在北方大陆迅速扩散.
- 这种类型学支持Perissodactyls在印度-巴基斯坦地区的潜在起源.
- 许多从历史上被归类为"马"或"Hyracotherium*/*Eohippus*"的物种都是基底,与现代马没有密切的关系.
结论:
- 早期虫的进化图片比以前假设的要简单.
- 对于早期的生虫属的分类学过高估计需要重新评估.
- 快速分散和印度-巴基斯坦的起源是早期perissodactyl进化的关键特征.
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