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Related Experiment Video

Updated: Jul 6, 2025

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Hypoconulid loss in cercopithecins: Functional and developmental considerations.

Keegan R Selig1

  • 1Department of Evolutionary Anthropology, Duke University, Biological Sciences Building, 130 Science Drive, Durham, NC, 27708, USA.

Journal of Human Evolution
|January 5, 2024
PubMed
Summary
This summary is machine-generated.

Cercopithecins lack a specific molar cusp (hypoconulid), leading to reduced dental topography. This loss is explained by the patterning cascade model, not the inhibitory cascade model, suggesting a holistic approach to molar development.

Keywords:
Dirichlet normal energyInhibitory cascade modelOrientation patch countPatterning cascade modelRelief index

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Area of Science:

  • Primate Paleontology
  • Dental Morphology
  • Developmental Biology

Background:

  • Cercopithecins lack a M3 hypoconulid, unlike papionins, with unclear functional and developmental consequences.
  • Previous studies suggest cercopithecines do not fit the inhibitory cascade model for molar development.

Purpose of the Study:

  • Quantify shape variation in cercopithecin M3s using dental topographic analysis.
  • Investigate the functional and developmental effects of hypoconulid loss in cercopithecins.
  • Test the applicability of the patterning cascade and inhibitory cascade models to hypoconulid loss.

Main Methods:

  • Dental topographic analysis of cercopithecin and Macaca M3s.
  • Virtual cropping of Macaca M3s to simulate hypoconulid loss.
  • Comparison of observed molar variation with predictions from developmental cascade models.

Main Results:

  • Hypoconulid loss in cercopithecins correlates with reduced dental topography.
  • The patterning cascade model successfully explains hypoconulid loss.
  • Hypoconulid loss accounts for the apparent lack of support for the inhibitory cascade model in cercopithecines.

Conclusions:

  • Hypoconulid loss impacts cercopithecin M3 morphology and topography, potentially linked to diet.
  • The patterning cascade model provides a better framework for understanding molar variation in cercopithecines.
  • A holistic approach integrating functional, developmental, and morphological data is crucial for studying primate molar evolution.