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Population systematics of chimpanzees using molar morphometrics.
1Department of Anthropology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. vpilbrow@uiuc.edu
Journal of Human Evolution
|September 13, 2006
Summary
Dental morphology effectively distinguishes chimpanzee (Pan) species and subspecies, aligning with non-dental evidence. This validates molar traits for differentiating fossil primate species.
Area of Science:
- Primatology
- Paleontology
- Evolutionary Biology
Background:
- Differentiating fossil species relies on dental morphology, yet this is rarely used for extant species.
- External morphology, ecology, and molecular data, crucial for living species, are unavailable for fossils.
Purpose of the Study:
- To evaluate the utility of dental evidence for classifying fossil hominids.
- To test if molar occlusal morphology can sort chimpanzee (Pan) populations into established species and subspecies.
Main Methods:
- Analyzed dental morphology of 341 chimpanzee individuals from 16 African populations.
- Used digital imaging to measure 15 upper and 19 lower molar occlusal traits.
- Applied discriminant analysis to size-adjusted and untransformed dental variables.
Main Results:
- Molar morphology successfully differentiated Pan troglodytes and Pan paniscus populations.
- Recognized distinct populations of P. t. verus and P. t. vellerosus.
- Observed close dental similarity between P. t. troglodytes and P. t. schweinfurthii.
Conclusions:
- Molar occlusal morphology is a reliable indicator for differentiating chimpanzee species and subspecies.
- Findings support the use of dental morphology for classifying fossil primate species with similar diversification patterns to Pan.
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