Variation in enamel thickness within the genus Homo

Smith, Tanya M. and Olejniczak, Anthony J. and Zermeno, John P. and Tafforeau, Paul and Skinner, Matthew M. and Hoffmann, Almut and Radovcic, Jakov and Toussaint, Michel and Kruszynski, Robert and Menter, Colin and Moggi-Cecchi, Jacopo and Glasmacher, Ulrich A. and Kullmer, Ottmar and Schrenk, Friedemann and Stringer, Chris and Hublin, Jean-Jacques (2012) Variation in enamel thickness within the genus Homo. Journal of Human Evolution, 62 (3). pp. 395-411. ISSN 0047-2484. (doi:https://doi.org/10.1016/j.jhevol.2011.12.004) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1016/j.jhevol.2011.12.004

Abstract

Recent humans and their fossil relatives are classified as having thick molar enamel, one of very few dental traits that distinguish hominins from living African apes. However, little is known about enamel thickness in the earliest members of the genus Homo, and recent studies of later Homo report considerable intra- and inter-specific variation. In order to assess taxonomic, geographic, and temporal trends in enamel thickness, we applied micro-computed tomographic imaging to 150 fossil Homo teeth spanning two million years. Early Homo postcanine teeth from Africa and Asia show highly variable average and relative enamel thickness (AET and RET) values. Three molars from South Africa exceed Homo AET and RET ranges, resembling the hyper thick Paranthropus condition. Most later Homo groups (archaic European and north African Homo, and fossil and recent Homo sapiens) possess absolutely and relatively thick enamel across the entire dentition. In contrast, Neanderthals show relatively thin enamel in their incisors, canines, premolars, and molars, although incisor AET values are similar to H. sapiens. Comparisons of recent and fossil H. sapiens reveal that dental size reduction has led to a disproportionate decrease in coronal dentine compared with enamel (although both are reduced), leading to relatively thicker enamel in recent humans. General characterizations of hominins as having ‘thick enamel’ thus oversimplify a surprisingly variable craniodental trait with limited taxonomic utility within a genus. Moreover, estimates of dental attrition rates employed in paleodemographic reconstruction may be biased when this variation is not considered. Additional research is necessary to reconstruct hominin dietary ecology since thick enamel is not a prerequisite for hard-object feeding, and it is present in most later Homo species despite advances in technology and food processing.

Item Type: Article
Uncontrolled keywords: Human evolution; Hominin tooth structure; Dental morphology; Early Homo; Archaic Homo; Neanderthal
Subjects: Q Science
Divisions: Faculties > Social Sciences > School of Anthropology and Conservation > Biological Anthropology
Depositing User: Matthew Skinner
Date Deposited: 15 May 2015 12:31 UTC
Last Modified: 18 May 2015 09:15 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/48519 (The current URI for this page, for reference purposes)
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