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Lateralized Feeding Behavior in a Paleozoic Reptile.

Robert R Reisz1, Mark J MacDougall2, Aaron R H LeBlanc3

  • 1Dinosaur Evolution Research Centre and International Centre of Future Science, Jilin University, Changchun, China; Department of Biology, University of Toronto Mississauga, Toronto, Canada.

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Summary

Fossil reptile tooth wear reveals the earliest evidence of lateralized feeding behavior. This discovery in Captorhinus aguti suggests deep evolutionary origins for directional behavior and brain lateralization in vertebrates.

Keywords:
Paleozoic reptiledentitiondifferential dental wear patternfeeding behaviorlateralitypreferential use of right side of jawtooth on tooth wear

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Vertebrate Zoology

Background:

  • Lateralized behaviors are observed in many extant vertebrates.
  • Evidence of lateralized behavior in extinct vertebrates is scarce due to preservation challenges.
  • Lateralization is often linked to hemispheric brain lateralization, offering insights into evolutionary origins.

Purpose of the Study:

  • To investigate the earliest evidence of lateralized behavior in fossil vertebrates.
  • To infer behavioral patterns from fossilized remains.
  • To explore the evolutionary history of brain lateralization in amniotes.

Main Methods:

  • Analysis of tooth wear patterns in a large sample of fossil reptile jaws (Captorhinus aguti).
  • Examination of nearly one hundred intact fossil jaws from the Early Permian period.
  • Repeatable observations to infer feeding behavior and asymmetry.

Main Results:

  • Consistent patterns of dental wear indicate a preferred side of jaw use for feeding.
  • The fossil reptile Captorhinus aguti exhibited lateralized feeding behavior, favoring the right side.
  • This represents the earliest fossil evidence of directional feeding behavior in amniotes.

Conclusions:

  • The findings provide direct evidence for deep evolutionary roots of directional behavior in ancient reptiles.
  • This discovery suggests that brain lateralization may have originated early in vertebrate evolution.
  • Lateralized feeding behavior in Captorhinus aguti offers clues about the evolutionary trajectory of brain lateralization.