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Morphoarchitectural variation in South African fossil cercopithecoid endocasts

Beaudet, Amélie and Dumoncel, Jean and de Beer, Frikkie and Duployer, Benjamin and Durrleman, Stanley and Gilissen, Emmanuel and Hoffman, Jakobus and Tenailleau, Christophe and Thackeray, John Francis and Braga, José Morphoarchitectural variation in South African fossil cercopithecoid endocasts. (2016) Journal of Human Evolution, vol. 101. pp. 65-78. ISSN 0047-2484

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Official URL: http://dx.doi.org/10.1016/j.jhevol.2016.09.003

Abstract

Despite the abundance of well-preserved crania and natural endocasts in the South African Plio-Pleistocene cercopithecoid record, which provide direct information relevant to the evolution of their endocranial characteristics, few studies have attempted to characterize patterns of external brain morphology in this highly successful primate Superfamily. The availability of non-destructive penetrating radiation imaging systems, together with recently developed computer-based analytical tools, allow for high resolution virtual imaging and modeling of the endocranial casts and thus disclose new perspectives in comparative paleoneurology. Here, we use X-ray microtomographic-based 3D virtual imaging and quantitative analyses to investigate the endocranial organization of 14 cercopithecoid specimens from the South African sites of Makapansgat, Sterkfontein, Swartkrans, and Taung. We present the first detailed comparative description of the external neuroanatomies that characterize these Plio-Pleistocene primates. Along with reconstruction of endocranial volumes, we combine a semi-automatic technique for extracting the neocortical sulcal pattern together with a landmark-free surface deformation method to investigate topographic differences in morphostructural organization. Besides providing and comparing for the first time endocranial volume estimates of extinct Plio-Pleistocene South African cercopithecoid taxa, we report additional information regarding the variation in the sulcal pattern of Theropithecus oswaldi subspecies, and notably of the central sulcus, and the neuroanatomical condition of the colobine taxon Cercopithecoides williamsi, suggested to be similar for some aspects to the papionin pattern, and discuss potential phylogenetic and taxonomic implications. Further research in virtual paleoneurology, applied to specimens from a wider geographic area, is needed to clarify the polarity, intensity, and timing of cortical surface evolution in cercopithecoid lineages.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at http://www.sciencedirect.com/science/article/pii/S0047248416301129
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche en Informatique et en Automatique - INRIA (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Université de Toulouse > Université de Toulouse I-Sciences Sociales - UT1 (FRANCE)
Other partners > Université Libre de Bruxelles - ULB (BELGIUM)
Other partners > South African Nuclear Energy Corporation - NECSA (SOUTH AFRICA)
Other partners > Royal Museum for Central Africa - RMCA - (BELGIUM)
Other partners > University of Pretoria (SOUTH AFRICA)
Other partners > University of the Witwatersrand - WITS (SOUTH AFRICA)
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Deposited By: cirimat webmestre
Deposited On:20 Jul 2017 08:08

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