TY - JOUR AU - Carlson, Keely B. AU - de Ruiter, Darryl J. AU - DeWitt, Thomas J. AU - McNulty, Kieran P. AU - Carlson, Kristian J. AU - Tafforeau, Paul AU - Berger, Lee R. PY - 2016/07/26 Y2 - 2024/03/29 TI - Developmental simulation of the adult cranial morphology of Australopithecus sediba JF - South African Journal of Science JA - S. Afr. J. Sci. VL - 112 IS - 7/8 SE - Research Article DO - 10.17159/sajs.2016/20160012 UR - https://sajs.co.za/article/view/3571 SP - 9 AB - <p>The type specimen of&nbsp;<em>Australopithecus sediba&nbsp;</em>(MH1) is a late juvenile, prompting some commentators to suggest that had it lived to adulthood its morphology would have changed sufficiently so as to render hypotheses regarding its phylogenetic relations suspect. Considering the potentially critical position of this species with regard to the origins of the genus&nbsp;<em>Homo</em>, a deeper understanding of this change is especially vital. As an empirical response to this critique, a developmental simulation of the MH1 cranium was carried out using geometric morphometric techniques to extrapolate adult morphology using extant male and female chimpanzees, gorillas and humans by modelling remaining development. Multivariate comparisons of the simulated adult&nbsp;<em>A. sediba&nbsp;</em>crania with other early hominin taxa indicate that subsequent cranial development primarily reflects development of secondary sexual characteristics and would not likely be substantial enough to alter suggested morphological affinities of&nbsp;<em>A. sediba</em>. This study also illustrates the importance of separating developmental vectors by sex when estimating ontogenetic change. Results of the ontogenetic projections concur with those from mandible morphology, and jointly affirm the taxonomic validity of&nbsp;<em>A. sediba</em>.</p> ER -