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Characterising early Homo: cladistic, morphological and metrical analyses of the original Plio-Pleistocene specimens

Published online by Cambridge University Press:  04 June 2019

Sandrine Prat
Affiliation:
UPR 2147 du CNRS, 44 rue de l'Admiral Mouchez, 75014 Paris, France
Francesco d'Errico
Affiliation:
George Washington University, Washington DC
Lucinda Backwell
Affiliation:
University of the Witwatersrand, Johannesburg
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Summary

Abstract

Since the discovery in 1959 of the first specimens allocated to Homo habilis in the Olduvai Gorge, no consensus has been achieved concerning the status of the species Homo habilis, and the taxonomic allocation of the specimens of early Homo. Four hypotheses have been expressed: (1) the specimens from Olduvai, East Turkana and Omo belong to the same palaeo-species: Homo habilis sensu lato; (2) the hypodigm is heterogeneous: two species could be defined in that group, Homo habilis sensu stricto and Homo rudolfensis; (3) these species do not belong to the genus Homo but to the genus Australopithecus; or (4) it would be more appropriate to include the specimens of Homo rudolfensis in the genus Kenyanthropus. The goal of this study is to re-evaluate the hypotheses concerning the taxonomy of the specimens attributed to early Homo, and to test whether they belong anatomically to the genus Homo or to another genus.

A morphological comparative study, a craniofacial variation study and numerical cladistic analyses were carried out on the original Plio-Pleistocene specimens. The Operational Taxonomic Unit used in this analysis is defined by the specimen and not by the species (as often used) in the absence of consensus on the content of the hypodigm of the species Homo habilis.

The results of this analysis show that based on the cranial specimens: (1) two species can be distinguished: habilis and rudolfensis; (2) the specimens belonging to these two taxa are included in the Homo clade; (3) the conclusions concerning the revision of the genus Homo and the inclusion of the specimens of Homo habilis and Homo rudolfensis in the genus Australopithecus or Kenyanthropus are questionable.

Résumé

Il n'existe actuellement aucun consensus concernant la taxinomie et la constitution de l'hypodigme de Homo habilis Leakey et al., 1964. Quatre hypothèses majeures sont aujourd'hui avancées à partir des restes crâniens et mandibulaires attribués classiquement à Homo habilis sensu lato: (1) tous les spécimens appartiennent à un seul et même taxon : Homo habilis; (2) deux espèces peuvent être identifiées dans ce groupe : Homo habilis sensu stricto et Homo rudolfensis; (3) ces spécimens n'appartiennent pas au genre Homo mais au genre Australopithecus; (4) les spécimens de l'espèce rudolfensis devraient être mis dans le genre Kenyanthropus.

Type
Chapter
Information
From Tools to Symbols
From Early Hominids to Modern Humans
, pp. 198 - 228
Publisher: Wits University Press
Print publication year: 2005

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