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Middle Pliocene hominin diversity: Australopithecus deyiremeda and Kenyanthropus platyops

Spoor, F; Leakey, MG; O'Higgins, P; (2016) Middle Pliocene hominin diversity: Australopithecus deyiremeda and Kenyanthropus platyops. Philosophical Transactions of the Royal Society B , 371 (1698) 10.1098/rstb.2015.0231. Green open access

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Abstract

Geometric morphometric shape analyses are used to compare the maxillae of the Kenyanthropus platyops holotype KNM-WT 40000, the Australopithecus deyiremeda holotype BRT-VP-3/1 and other australopiths. The main aim is to explore the relationship between these two specimens and contemporary Australopithecus afarensis. Five landmarks placed on lateral views of the maxillae quantify key aspects of the morphology. Generalised Procrustes analyses and principal component analyses of the resulting shape coordinates were performed. The magnitudes of differences in shape and their significances were assessed using Procrustes and Mahalanobis’ distances, respectively. Both KNM-WT 40000 and BRTVP- 3/1 show statistically significant differences in maxillary shape from A. afarensis, but do so in dissimilar ways. Moreover, the former differs more from A. afarensis than the latter. KNM-WT 40000 has a more anteriorly positioned zygomatic process with a transversely flat, and more orthognathic subnasal clivus. BRT-VP-3/1 has a more inferiorly positioned zygomatic process, a slightly retracted dental arcade, but without shortening of the anterior maxilla. These findings are consistent with previous conclusions that the two fossils should be attributed to separate species, rather than to A. afarensis, and with the presence of three contemporary hominin species in the middle Pliocene of eastern Africa.

Type: Article
Title: Middle Pliocene hominin diversity: Australopithecus deyiremeda and Kenyanthropus platyops
Open access status: An open access version is available from UCL Discovery
DOI: 10.1098/rstb.2015.0231
Publisher version: http://dx.doi.org/10.1098/rstb.2015.0231
Language: English
Additional information: Copyright © 2016 The Royal Society. All rights reserved. The final publication is available at The Royal Society via http://dx.doi.org/10.1098/rstb.2015.0231
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Anthropology
URI: https://discovery.ucl.ac.uk/id/eprint/1485909
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