来自埃塞俄比亚的新型人类足迹显示了多种新纪双脚适应
Yohannes Haile-Selassie1, Beverly Z Saylor, Alan Deino
1The Cleveland Museum of Natural History, Cleveland, Ohio 44106, USA. yhailese@cmnh.org
Nature
|March 31, 2012
概括
来自东非的新型人类足化石揭示了一种以前未知的物种,它有一个可对立的大脚,这表明人类祖先在普略纪晚期的运动方式多样化.
科学领域:
- 古人类学古人类学.
- 人类进化人类进化
- 古生物学的古生物学
背景情况:
- 东非的早期普略纪晚期 (大约340万年前) 对于理解人类进化至关重要.
- 现有的化石记录表明,一个主导的原始人物种,奥斯拉洛皮塞克斯 (Australopithecus afarensis),具有特定的运动适应性.
研究的目的:
- 为了分析东非新发现的人类踏板元素.
- 确定这些化石与已知的人类物种相关的分类学和运动学影响.
主要方法:
- 对新发现的人类足骨的形态分析.
- 与化石原始人类进行比较分析,包括Ardipithecus ramidus和Australopithecus afarensis.
- 化石元素的放射测年.化石元素的放射测年.
主要成果:
- 发现的踏板元件属于一个不同于澳大利亚罗皮铁克斯 (Australopithecus afarensis) 的人类物种.
- 这种新物种表现出一个对立的大脚,这种特征以前与早期的原始人如Ardipithecus ramidus有关.
- 这些化石表明,Ardipithecus ramidus类的机 locomotive 适应在代晚期仍然存在.
结论:
- 多种具有不同运动策略的原始人物种在普略纪晚期开始时在东非共存.
- 这一发现挑战了以前关于人类多样性和在这一时期适应性的假设.
- 这一发现突显了人类进化的马赛克性质,以及后来的人类物种保留了原始特征.
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