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Molar scaling in strepsirrhine primates
Christopher J Vinyard1, Jandy Hanna
1Department of Anatomy, NEOUCOM, Rootstown, OH 44272, USA. cvinyard@neoucom.edu
Journal of Human Evolution
|June 7, 2005
Summary
Primate molar size scales with body mass, but not as predicted by metabolic scaling. Facial skull size, not brain mass, correlates with molar area in strepsirrhines.
Area of Science:
- Primate Paleontology
- Comparative Anatomy
- Evolutionary Biology
Background:
- Understanding primate dental allometry is crucial for reconstructing evolutionary relationships and dietary habits.
- Previous studies on primate molar scaling have yielded varied results, necessitating further investigation into factors influencing these patterns.
Purpose of the Study:
- To investigate the scaling relationships of maxillary molar dimensions with body and skull size in strepsirrhine primates.
- To test the metabolic scaling hypothesis regarding primate molar area and body mass.
- To explore the influence of diet and brain mass on strepsirrhine molar scaling patterns.
Main Methods:
- Comparative analysis of maxillary molar areas and dimensions across 54 species of living and subfossil strepsirrhines.
- Statistical scaling analyses (allometry and isometry) relative to body mass and basicranial length.
- Comparison of molar scaling patterns across different dietary groups (frugivorous, folivorous, insectivorous) and infraorders (Lorisiformes, Lemuriformes).
Main Results:
- Strepsirrhine maxillary molar areas exhibit negative allometry or isometry relative to body mass, contradicting metabolic scaling predictions.
- Molar areas show positive allometry relative to basicranial length, challenging previous assumptions of isometric skull scaling.
- No significant differences in molar scaling were found among dietary groups, though folivores show distinct M1 proportions.
- Brain mass had minimal influence on molar size, while facial skull size showed a strong positive correlation with relative molar areas.
Conclusions:
- Primate molar scaling is influenced by factors beyond metabolic rate, with facial skull development playing a significant role.
- Dietary guilds do not appear to be strong drivers of molar scaling patterns in strepsirrhines.
- The observed correlations suggest shared developmental pathways between molar and facial skull elements in strepsirrhine evolution.
