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Related Experiment Video

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Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face
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Basicranium and face: Assessing the impact of morphological integration on primate evolution.

Dimitri Neaux1, Gabriele Sansalone2, Justin A Ledogar1

  • 1Function, Evolution & Anatomy Research Lab, Zoology Division, School of Environmental and Rural Science, University of New England, NSW, 2351, Armidale, Australia.

Journal of Human Evolution
|April 3, 2018
PubMed
Summary
This summary is machine-generated.

The primate face and basicranium are integrated but evolve differently. Morphological integration influences primate cranial shape evolution, driven by brain size and locomotion.

Keywords:
Cranial baseDisparityEvolutionary ratesGeometric morphometricsModularity

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Primate paleontology

Background:

  • The basicranium and facial skeleton are key primate structures with diverse forms.
  • Morphological integration significantly impacts their evolution, but this is not fully understood.
  • Understanding craniofacial integration is crucial for primate evolutionary hypotheses.

Purpose of the Study:

  • To analyze how integration affects basicranial and facial evolutionary pathways in primates.
  • To quantify integration and modularity between primate basicranium and face.
  • To assess the influence of integration on evolutionary rates and disparity.

Main Methods:

  • Phylogenetically-informed partial least squares analyses to quantify integration and modularity.
  • Time-calibrated phylogenetic tree to analyze evolutionary rates.
  • Comparison of morphological disparity with Brownian motion models.
  • Correlation analysis with endocranial volume, positional behavior, and diet.

Main Results:

  • The face and basicranium, though integrated, exhibit distinct evolutionary rates.
  • Morphological integration was found to significantly impact primate craniofacial shape disparity over time.
  • Endocranial volume and positional behavior are key drivers of cranial evolution, influenced by integration.

Conclusions:

  • Craniofacial integration plays a critical role in shaping primate evolutionary trajectories.
  • Despite integration, basicranial and facial components evolve at different rates.
  • Brain size and locomotion are significant factors in primate cranial evolution, modulated by integration.