Ontogenetic study of allometric variation in Homo and Pan mandibles

The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology
Nandini Singh

Abstract

Investigating ontogenetic variation and allometry in the mandible can provide valuable insight and aid in addressing questions related to the ontogeny of the skull. Here, patterns of ontogenetic shape change and allometric trajectories were examined in the mandible of 187 sub-adult and adult humans, bonobos, and chimpanzees. Procrustes-based geometric morphometrics was employed to quantify and analyze mandibular form. Thirty three-dimensional landmarks were used to capture the overall morphology of the mandible, and the landmarks were analyzed as a whole and subdivided into separate anterior and posterior units. Principal component analyses in Procrustes shape-space and form-space, and multivariate regressions were used to examine patterns of ontogenetic and allometric shape change. Results suggest that humans are distinct from Pan both in their mandibular morphology, particularly in the anterior-alveolar region, and direction of allometric trajectory. Chimpanzees and bonobos have parallel ontogenetic trajectories, but also show differences in mandibular shape. Species-specific features and adult mandibular shape are established before or by the eruption of the deciduous dentition. This suggests that developmental processes pri...Continue Reading

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Citations

Jun 20, 2020·American Journal of Physical Anthropology·Ricardo Miguel GodinhoCélia Gonçalves
Aug 18, 2020·American Journal of Physical Anthropology·Hyunwoo JungNoreen von Cramon-Taubadel
Dec 12, 2018·American Journal of Physical Anthropology·M Kathleen Pitirri, David Begun
May 2, 2018·Journal of Human Evolution·Claire E TerhuneChris A Robinson

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