证据表明人类是从一个手指节行走的祖先进化而来的
1Department of Anthropology, The George Washington University, Washington, DC 20052, USA. brich@gwu.edu
Nature
|April 4, 2000
概括
早期的原始人,如奥斯拉洛皮塞克斯 (Australopithecus anamensis) 和奥斯拉洛皮塞克斯 (Australopithecus afarensis),很可能是从手指节行走的祖先进化而来的. 这挑战了先前关于灵长类动物运动和双脚的起源的理论.
科学领域:
- 古人类学古人类学.
- 灵长类动物的进化
- 功能性形态学 功能性形态学
背景情况:
- 双脚是一种定义人类特征,证据可以追溯到至少410万年前.
- 双脚的进化起源和之前的运动方式是很少理解的.
- 现有的化石和解剖学数据对早期原始人运动的洞察力有限.
研究的目的:
- 为了研究早期人类化石的手腕形态.
- 为了确定人类双脚之前的祖先运动.
- 重新评估非洲猿类和人类类之间的进化关系.
主要方法:
- 在奥斯拉洛皮塞克斯 (KNM-ER 20419) 和奥斯拉洛皮塞克斯 (AL 288-1) 化石中对远端辐射形态的分析.
- 较后的人类类动物和非手节行走的人类类灵长类动物的手腕形态的比较分析.
- 基于化石证据的祖先运动行为重建.
主要成果:
- 奥斯特拉洛皮塞克斯 (Australopithecus anamensis) 和奥斯特拉洛皮塞克斯 (Australopithecus afarensis) 的化石表现出专门的手腕形态,表明手指节行走.
- 这种形态与后来的原始人和其他人类类灵长类动物的形态有很大不同.
- 这些发现表明,手指节行走是非洲猿和人类血统中衍生的特征.
结论:
- 人类双脚可能是从一个手指节行走的祖先进化而来的.
- 这种祖先可能已经适应了部分陆地生活方式.
- 这项研究驳斥了独特的泛大猩猩类的关键证据,并重新理解了早期人类进化的理解.
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