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The Interrelation Among Allometry, Phylogeny, and Diet in the Molar Cervix
1Department of Ecology, Evolution & Behavior, University of Minnesota, Saint Paul, Minnesota, USA.
American Journal of Biological Anthropology
|July 16, 2026
Summary
Investigating catarrhine primate root cervix morphology reveals limited size influence. While phylogeny and diet impact root cervix shape, their relationship requires further study to fully understand these functional signals.
Area of Science:
- Primate paleontology
- Dental morphology
- Functional anatomy
Background:
- Root surface morphology analysis offers insights into primate diet and taxonomy.
- Previous studies show variable success in interpreting functional signals from primate tooth roots.
- The root cervix, a functionally significant area, has potential for enhanced analysis.
Purpose of the Study:
- To assess if analyzing the root cervix improves understanding of catarrhine relationships.
- To investigate the influence of size on root cervix morphology.
- To determine the impact of phylogeny and diet on root cervix shape.
Main Methods:
- Collected 2D semilandmark data from cross-sections of mandibular molars in 68 extant catarrhines.
- Utilized multivariate regression, principal component analysis (PCA), and phylogenetic generalized least squares (PGLS).
- Applied phylogenetically aligned PCA (PACA) and phylogenetic PCA (pPCA) to account for evolutionary non-independence.
Main Results:
- Allometric effects (size influence) were statistically significant but weak across all molar positions.
- Phylogenetic signal was significant but lower than expected under Brownian motion.
- PGLS analysis indicated that functional signals related to diet were removed at M1, diminished at M2 and M3.
Conclusions:
- Root cervix morphology is influenced by both phylogeny and diet, though these factors are strongly interrelated.
- Size has a limited impact on root cervix morphology and does not obscure functional signals.
- Further research is necessary to disentangle the complex interplay between phylogeny and diet in shaping root cervix morphology.
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