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Evidence that humans evolved from a knuckle-walking ancestor
1Department of Anthropology, The George Washington University, Washington, DC 20052, USA. brich@gwu.edu
Nature
|April 4, 2000
Summary
Early hominids, such as Australopithecus anamensis and Australopithecus afarensis, likely evolved from knuckle-walking ancestors. This challenges previous theories on primate locomotion and the origin of bipedalism.
Area of Science:
- Paleoanthropology
- Primate Evolution
- Functional Morphology
Background:
- Bipedalism is a defining hominid trait, with evidence dating back at least 4.1 million years.
- The evolutionary origins of bipedalism and the preceding locomotion are poorly understood.
- Existing fossil and anatomical data offer limited insight into early hominid movement.
Purpose of the Study:
- To investigate the wrist morphology of early hominid fossils.
- To determine the ancestral locomotion preceding hominid bipedalism.
- To re-evaluate the evolutionary relationships within the African ape and human clade.
Main Methods:
- Analysis of distal radial morphology in Australopithecus anamensis (KNM-ER 20419) and Australopithecus afarensis (AL 288-1) fossils.
- Comparative analysis with wrist morphology of later hominids and non-knuckle-walking anthropoid primates.
- Reconstruction of ancestral locomotor behaviors based on fossil evidence.
Main Results:
- Fossils of Australopithecus anamensis and Australopithecus afarensis exhibit specialized wrist morphology indicative of knuckle-walking.
- This morphology differs significantly from that of later hominids and other anthropoid primates.
- The findings suggest knuckle-walking is a derived trait within the African ape and human lineage.
Conclusions:
- Hominid bipedalism likely evolved from a knuckle-walking ancestor.
- This ancestor was potentially already adapted to a partially terrestrial lifestyle.
- The study refutes key evidence for a distinct Pan-Gorilla clade and reframes understanding of early hominid evolution.
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