Related Experiment Videos
Early hominin limb proportions
Brian G Richmond1, Leslie C Aiello, Bernard A Wood
1Department of Anthropology, George Washington University, 2110 G St, NW, Washington, DC 20052, USA. brich@gwu.edu
Journal of Human Evolution
|October 24, 2002
Summary
Hominin limb proportions are complex, with early species showing varied traits. This study suggests it
Area of Science:
- Paleoanthropology
- Primate Anatomy
- Evolutionary Biology
Background:
- Hominin limb proportion evolution is complex, involving reversals and decoupling.
- Intraspecific variation is crucial for understanding fossil limb proportions.
Purpose of the Study:
- To statistically assess limb proportion differences among four early hominin fossil skeletons.
- To compare fossil limb proportions to those of extant great apes and humans.
Main Methods:
- Utilized exact randomization methods for statistical comparisons.
- Analyzed limb length and midshaft circumference data from fossil and extant species.
- Accounted for intraspecific variation within Gorilla gorilla, Pan troglodytes, Pongo pygmaeus, and Homo sapiens.
Main Results:
- Humerofemoral proportions of OH 62 and AL 288-1 are rarely different, but midshaft circumferences are common.
- BOU-VP-12/1 shows significant humerofemoral index differences from OH 62 and AL 288-1, but not KNM-WT 15000.
- BOU-VP-12/1 exhibits unique relative forearm length, exceeding African apes and resembling Pongo.
Conclusions:
- It may be premature to classify Homo (or Australopithecus) habilis as having more apelike limb proportions than Australopithecus afarensis.
- Australopithecus africanus displays derived limb proportions compared to Australopithecus afarensis, not simply inherited arboreal traits.
- The primitive body design of Homo habilis is underscored by limb proportions similar to Australopithecus afarensis.