Oblique human symphyseal angle is associated with an evolutionary rate-shift early in the hominin clade

Bibliographic Collection: 
Publication Type: Journal Article
Authors: Pampush, James D.; Scott, Jill E.; Robinson, Chris A.; Delezene, Lucas K.
Year of Publication: 2018
Volume: 123
Pagination: 84 - 95
Date Published: 2018/10/01/
Publication Language: eng
ISBN Number: 0047-2484
Keywords: Hypofunction hypothesis, Mandibular integration, Phylogenetic trend, Preoral processing, Spandrel, ‘AUTEUR’ (R package)

The rate of change in primate mandibular symphyseal angles was modeled with particular aim of locating a rate-shift within the hominin clade. Prior work noted that the human symphyseal angle must have experienced a rapid rate of change in order to assume the modern human form, suggestive of the non-random work of natural selection. This study indicates that the rate of symphyseal evolution rose dramatically between Australopithecus anamensis and Australopithecus afarensis and continued throughout the diversification of the hominin clade. Noting the timing of this event, we speculate as to what ecological factors could have been at play in driving this rearrangement of the anterior mandible, contributing to the eventual appearance of the human chin.

Short Title: Journal of Human Evolution