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A geometric morphometric analysis of hominin upper first molar shape

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Gómez Robles, Aida y Martinón Torres, María y Bermúdez de Castro, José María y Margvelashvili, A. y Bastir, Markus y Arsuaga, Juan Luis y Pérez Pérez, Alejandro y Estebaranz, Ferran y Martínez, Laura M. (2007) A geometric morphometric analysis of hominin upper first molar shape. Journal of Human Evolution, 53 . pp. 272-285. ISSN 0047-2484

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URL Oficial: http://www.sciencedirect.com/science/journal/00472484



Resumen

Recent studies have revealed interesting differences in upper first molar morphology across the hominin fossil record, particularly significant
between H. sapiens and H. neanderthalensis. Usually these analyses have been performed by means of classic morphometric methods, including
the measurement of relative cusp areas or the angles defined between cusps. Although these studies have provided valuable information for the
morphological characterization of some hominin species, we believe that the analysis of this particular tooth could be more conclusive for taxonomic
assignment. In this study, we have applied geometric morphometric methods to explore the morphological variability of the upper first
molar (M1) across the human fossil record. Our emphasis focuses on the study of the phenetic relationships among the European middle Pleistocene
populations (designated as H. heidelbergensis) with H. neanderthalensis and H. sapiens, but the inclusion of Australopithecus and early
Homo specimens has helped us to assess the polarity of the observed traits. H. neanderthalensis presents a unique morphology characterized by
a relatively distal displacement of the lingual cusps and protrusion in the external outline of a large and bulging hypocone. This morphology can
be found in a less pronounced degree in the European early and middle Pleistocene populations, and reaches its maximum expression with the
H. neanderthalensis lineage. In contrast, modern humans retain the primitive morphology with a square occlusal polygon associated with a round
external outline.


Tipo de documento:Artículo
Palabras clave:Neandertals; Dental anthropology; Geometric morphometrics; Maxillary molars
Materias:Ciencias > Geología > Paleontología
Código ID:26869
Depositado:30 Sep 2014 11:17
Última Modificación:11 Dic 2018 08:42

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