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Scaling of Anatomically Derived Maximal Bite Force in Primates.

Ashley R Deutsch1, Edwin Dickinson2, Kaitlyn C Leonard2

  • 1Department of Anthropology, University of Florida, Gainesville, Florida.

Anatomical Record (Hoboken, N.J. : 2007)
|October 7, 2019
PubMed
Summary

Maximum bite force in primates scales with body size, but diet shows no significant effect. Platyrrhine primates have a more mechanically advantageous jaw system than catarrhines.

Keywords:
biomechanicsdietary correlatesmechanical advantagephysiological cross-sectional areaskull measurement

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Area of Science:

  • Primate anatomy
  • Biomechanics
  • Paleontology

Background:

  • Understanding primate masticatory function is crucial for evolutionary studies.
  • Previous research explored muscle architecture and diet but lacked integrated biomechanical analysis.

Purpose of the Study:

  • To estimate maximum bite force in catarrhine and platyrrhine primates.
  • To investigate how bite force scales with body size and diet.
  • To compare the mechanical advantage of masticatory systems between primate parvorders.

Main Methods:

  • Combined muscle physiological cross-sectional area with jaw lever arm lengths.
  • Estimated bite force at the incisor, canine, and paracone.
  • Analyzed scaling relative to cranial geometric mean and body mass.

Main Results:

  • Bite force scales with positive allometry relative to cranial geometric mean and body mass.
  • Platyrrhines exhibit positive allometry, while catarrhines show isometric scaling.
  • No statistically significant effect of diet on bite force scaling was detected.

Conclusions:

  • Dietary signals in muscle architecture are undetectable when integrated with biomechanical leverages.
  • The platyrrhine masticatory system appears more mechanically advantageous than the catarrhine system.