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Evaluating the "dual selection" hypothesis of canine reduction
1New York College of Osteopathic Medicine, Old Westbury, 11568, USA.
American Journal of Physical Anthropology
|March 1, 1996
Summary
The "dual selection" model for canine reduction in human evolution is not supported by comparative data. Analysis of anthropoid primate canine wear and occlusion patterns did not align with the model's predictions.
Area of Science:
- Paleoanthropology
- Primate Evolution
- Dental Morphology
Background:
- The dual selection model proposes canine reduction in hominid evolution is linked to incisal field incorporation.
- This model relies on specific wear and occlusal patterns in anthropoid primate canines, especially females.
Observation:
- A study analyzed canine wear and occlusion in 311 male and female anthropoid primates.
- The research focused on identifying tip-to-tip occlusion and "gripping and pulling" wear patterns.
Findings:
- No evidence was found for typical tip-to-tip canine occlusion in the studied primates.
- Wear patterns did not support a "gripping and pulling" function during food processing.
- The development of the mesial cristid was not compellingly associated with canine reduction.
Implications:
- The findings challenge the "dual selection" hypothesis as an explanation for canine reduction in hominid evolution.
- Further research is needed to explore alternative selective pressures driving canine size changes.