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贝叶斯总证据约会回顾惰的族系和生物地理学:对形态时钟分析的警告故事
Julia V Tejada1,2, Pierre-Olivier Antoine2, Philippe Münch3
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
Systematic biology
|December 2, 2023
概括
这项研究整合了化石和遗传数据来重建的进化,揭示了显著的形态趋同,并挑战了关于加勒比关系的先前想法. 这些发现强调了完整的化石记录对于准确的进化见解的重要性.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 系统学 系统学 系统学
- 人类遗传学 是一个学科.
背景情况:
- Sloths (哺乳动物: Folivora) 呈现出高度的形态融合,使进化研究复杂化.
- 现有的分子数据只捕获了一小部分惰动物物种丰富度.
- 整合形态和分子数据对于理解具有不完整化石记录的克拉德至关重要.
研究的目的:
- 提出一个替代性的假设的进化强调形态趋同.
- 重建现存和化石惰动物的遗传学和时间框架.
- 评估化石记录的完整性和分类型采样对遗传学和生物地理学推断的影响.
主要方法:
- 贝叶斯总证据约会结合了形态和分子特征.
- 使用不同的时钟模型和形态数据集进行分析.
- 后期删除高百分比缺失字符的类型,以评估拓分辨率.
主要成果:
- 现存的惰动物Bradypus和Choloepus一直被分别放置在Megatherioidea和Mylodontoidae中.
- 加勒比 sloths (Megalocnoidea) 形成一个单体的姐妹类 Megatherioidea,与之前的假设相矛盾.
- "Megalonychidae"的多重性进一步得到了支持,在五个不同的类中发现了成员.
结论:
- 综合证据分析显示",Megalonychidae"的显著形态趋同和多重性.
- 加勒比海的殖民化与阿维斯山脊沿线的地质事件保持一致.
- 不完整的化石记录和分类型采样引入了偏见,强调了宏观进化研究中需要强有力的数据的需要.
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