期刊
AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY
卷 153, 期 1, 页码 116-123出版社
WILEY-BLACKWELL
DOI: 10.1002/ajpa.22400
关键词
Chad; early hominins; dental roots; root morphology; teeth evolution
资金
- Agence Nationale de la Recherche [ANR 05-BLAN-0235, EVAH: NT09 468 003]
- Ministere des Affaires Etrangeres (DCSUR) [FSP 2005-54]
- Ministere Francais de l'Education Nationale de l'Enseignement Superieur et de la Recherche, Universite de N'Djamena/Departement de Paleontologie, Centre National d'Appui a la Recherche-CNAR)
- Universite de Poitiers, Centre National de la Recherche Scientifique (CNRS: Departement INEE and ECLIPSE)
- de la Cooperation Franco-Tchadienne, Ambassade de Francea N'Djamena)
- Region Poitou-Charentes
- NSF program RHOI (USA)
- Armee Francaise (Mission d'Assistance Militaire and dispositif Epervier)
The evolution of the teeth in hominins is characterized by, among other characters, major changes in root morphology. However, little is known of the evolution from a plesiomorphic, ape-like root morphology to the crown hominin morphology. Here we present a study of the root morphology of the Miocene Chadian hominin Sahelanthropus tchadensis and its comparison to other hominins. The morphology of the whole lower dentition (I-1-M-3) was investigated and described. The comparison with the species Ardipithecus kaddaba and Ardipithecus ramidus indicates a global homogeneity of root morphology in early hominins. This morphology, characterized notably by a reduction of the size and number of the roots of premolars, is a composite between an ape-like morphology and the later hominin morphology. Trends for root evolution in hominins are proposed, including the transition from a basal hominoid to extant Homo sapiens. This study also illustrates the low association between the evolution of tooth root morphology and the evolution of crowns in hominins. Am J Phys Anthropol 153:116-123, 2014. (c) 2013 Wiley Periodicals, Inc.
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