Ontogeny of the orbits of Pan troglodytes: structural and functional implications.

Authors

  • Guillermo Germán Joosten División Antropología, Museo de La Plata
  • María Mercedes Gould División Antropología, Museo de La Plata
  • Marisol Anzelmo División Antropología, Museo de La Plata CONICET, Argentina
  • Fernando Ramírez Rozzi UPR 2147 CNRS, Dynamique de l'évolution humaine, Paris , Francia
  • Marina Laura Sardi División Antropología, Museo de La Plata CONICET, Argentina

DOI:

https://doi.org/10.24215/25456377e061

Keywords:

Supraorbital torus Skull, Chimpanzee, Vision,

Abstract

The orbits of Haplorrhini primates are distinct among mammals because they are completely separated from the temporal fenestra and surrounded by bone; they are also convergent and frontalized, and provide the basis for the development of a notorious supraorbital torus. These characteristics have been described both as adaptations to their life habits and as resulting from structural rearrangements of the skull functional matrices. The goal of this work is to analyze morphological changes of the orbits in a transversal ontogenetic sample of Pan troglodytes and their association with adjacent structures in order to discuss structural and functional implications of these changes. We used 52 computerized tomography images of Pan troglodytes skulls ranging in age from 8 months to adults. Landmarks were recorded; in addition, volumetric and linear measurements were taken to extract angular variables and proportions. ANOVA, linear and partial regressions and Principal Component Analysis were performed. Our results indicate that the adaptive (functional) traits of the orbits in Pan troglodytes are set early in ontogeny and do not vary during the postnatal period, whereas their relationship with adjacent structures undergoes major changes.

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Published

2018-07-26

Issue

Vol. 3 No. 2 (2018)

Section

Artículos

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