Document Detail


Allometric scaling of infraorbital surface topography in Homo.
MedLine Citation:
PMID:  19118866     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Infraorbital morphology is often included in phylogenetic and functional analyses of Homo. The inclusion of distinct infraorbital configurations, such as the "canine fossa" in Homo sapiens or the "inflated" maxilla in Neandertals, is generally based on either descriptive or qualitative assessments of this morphology, or simple linear chord and subtense measurements. However, the complex curvilinear surface of the infraorbital region has proven difficult to quantify through these traditional methods. In this study, we assess infraorbital shape and its potential allometric scaling in fossil Homo (n=18) and recent humans (n=110) with a geometric morphometric method well-suited for quantifying complex surface topographies. Our results indicate that important aspects of infraorbital shape are correlated with overall infraorbital size across Homo. Specifically, individuals with larger infraorbital areas tend to exhibit relatively flatter infraorbital surface topographies, taller and narrower infraorbital areas, sloped inferior orbital rims, anteroinferiorly oriented maxillary body facies, posteroinferiorly oriented maxillary processes of the zygomatic, and non-everted lateral nasal margins. In contrast, individuals with smaller infraorbital regions generally exhibit relatively depressed surface topographies, shorter and wider infraorbital areas, projecting inferior orbital rims, posteroinferiorly oriented maxillary body facies, anteroinferiorly oriented maxillary processes, and everted lateral nasal margins. These contrasts form a continuum and only appear dichotomized at the ends of the infraorbital size spectrum. In light of these results, we question the utility of incorporating traditionally polarized infraorbital morphologies in phylogenetic and functional analyses without due consideration of continuous infraorbital and facial size variation in Homo. We conclude that the essentially flat infraorbital surface topography of Neandertals is not unique and can be explained, in part, as a function of possessing large infraorbital regions, the ancestral condition for Homo. Furthermore, it appears likely that the diminutive infraorbital region of anatomically modern Homo sapiens is a primary derived trait, with related features such as depressed infraorbital surface topography expressed as correlated secondary characters.
Authors:
Scott D Maddux; Robert G Franciscus
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-12-31
Journal Detail:
Title:  Journal of human evolution     Volume:  56     ISSN:  0047-2484     ISO Abbreviation:  J. Hum. Evol.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-01-28     Completed Date:  2009-03-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0337330     Medline TA:  J Hum Evol     Country:  England    
Other Details:
Languages:  eng     Pagination:  161-74     Citation Subset:  IM    
Affiliation:
Department of Anthropology, University of Iowa, Iowa City, IA 52242, USA. scott-maddux@uiowa.edu
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MeSH Terms
Descriptor/Qualifier:
Africa
Animals
Arctic Regions
Asia
Australia
Data Interpretation, Statistical
Europe
Fossils*
Hominidae / anatomy & histology*
Humans
Maxilla / anatomy & histology
Orbit / anatomy & histology*
Paleontology / methods*
Phylogeny
Weights and Measures*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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