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Geometric morphometric analysis of the crown morphology of the lower first premolar of hominins, with special attention to Pleistocene Homo

Gómez Robles, Aida and Martinón Torres, María and Bermúdez de Castro, José María and Prado Simón, Leyre and Sarmiento Pérez, Susana and Arsuaga, Juan Luis (2008) Geometric morphometric analysis of the crown morphology of the lower first premolar of hominins, with special attention to Pleistocene Homo. Journal of Human Evolution, 55 (4). pp. 627-638. ISSN 0047-2484

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Abstract

This article is the third of a series that explores hominin dental crown morphology by means of geometric
morphometrics. After the analysis of the lower second premolar and the upper first molar crown
shapes, we apply the same technique to lower first premolar morphology. Our results show a clear
distinction between the morphology seen in earlier hominin taxa such as Australopithecus and African
early Homo, as well as Asian H. erectus, and more recent groups such as European H. heidelbergensis, H.
neanderthalensis, and H. sapiens. The morphology of the earlier hominins includes an asymmetrical
outline, a conspicuous talonid, and an occlusal polygon that tends to be large. The morphology of
the recent hominins includes a symmetrical outline and a reduced or absent talonid. Within this later
group, premolars belonging to H. heidelbergensis and H. neanderthalensis tend to possess a small and
mesiolingually-displaced occlusal polygon, whereas H. sapiens specimens usually present expanded and
centered occlusal polygons in an almost circular outline. The morphological differences among Paranthropus,
Australopithecus, and African early Homo as studied here are small and evolutionarily less
significant compared to the differences between the earlier and later homin taxa. In contrast to the lower
second premolar and the upper first molar crown, the inclusion of a larger hominin sample of lower first
premolars reveals a large allometric component.


Item Type:Article
Uncontrolled Keywords:Middle Pleistocene European populations; Dental anthropology; Procrustes superimposition; Allometry
Subjects:Sciences > Geology > Paleontology
ID Code:12239
Deposited On:14 Feb 2011 11:44
Last Modified:29 Sep 2014 09:17

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