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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Iliac auricular surface morphofunctional study in felidae.

Jean-Pierre Pallandre1, Raphaël Cornette1, Marie-Ange Placide1

  • 1Sorbonne Université, Muséum national d'Histoire naturelle, Institut de Systématique Evolution Biodiversité (UMR 7205 MNHN/CNRNS/UPMC/EPHE), 57 Rue Cuvier, 75005, Paris, France.

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Summary

The iliac auricular surface shape in felids is influenced by body mass and prey, not locomotion. Larger cats have a more complex surface for stability when subduing large prey.

Keywords:
Auricular surfaceEvolutionFelidaeIliumJunctionLocomotionPelvisPredatory behaviorSacroiliac

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Area of Science:

  • Comparative anatomy
  • Functional morphology
  • Vertebrate paleontology

Background:

  • Felids exhibit significant variation in body mass and prey selection.
  • Body size influences hunting strategies, from rapid bites for small prey to sustained bites for large prey.
  • Sacroiliac joint morphology in relation to ecological factors is not well understood.

Purpose of the Study:

  • To investigate the morphology of the iliac auricular surface in felids.
  • To determine the influence of body mass, prey selection, and bite type on this joint.
  • To assess the role of locomotor specialization on sacroiliac morphology.

Main Methods:

  • Qualitative and quantitative analyses of the iliac auricular surface shape.
  • Comparison across felid species with varying body masses and ecological niches.
  • Biomechanical interpretation of morphological differences.

Main Results:

  • Body mass, prey selection, and bite type significantly influence auricular surface morphology.
  • Locomotor specialization showed no significant effect on the sacroiliac joint.
  • Big cats possess a more elevated, W-shaped auricular surface, while small cats have a smoother, C-shaped surface.

Conclusions:

  • The complex auricular surface in large felids enhances joint stiffness and support.
  • This adaptation aids in subduing large prey using sustained bites.
  • Morphological adaptations of the sacroiliac joint are linked to feeding ecology rather than locomotion.