Interspecific allometry of the mandible,dental arch,and molar area in anthropoid primates: Functional morphology of masticatory components |
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Authors: | Eisaku Kanazawa A L Rosenberger |
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Institution: | (1) Department of Anatomy, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho, Nishi, Matsudo, 271 Chiba, Japan;(2) Department of Anthropology, University of Illinois at Chicago, 60680 Chicago, Illinois, U.S.A. |
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Abstract: | Allometric equations relating the lengths and widths of the mandible and dental arch, and of molar area, were obtained in
a wide range of anthropoid primates grouped into four subsets, pongids, cercopithecids, nonmarmoset platyrrhines, and marmosets.
Mandibular width is negatively allometric against length across anthropoids but cercopithecids had relatively wider mandibles
than nonmarmosets of the same size class. Mandibular length relative to dental arch length was isometric within and between
the four groups but dental arch width scaled negatively against all the other dimensions examined in this study, indicating
a functional dissociation between the dental arcade and the bony mandible. Molar area showed various scaling patterns relative
to mandibular length (isometry) and width (positive). There were no parameters that scaled positively against body weight
across groups, except for molar area in cercopithecids (strongly) and nonmarmoset (moderately). Notable functional specializations
include relatively long dental arches in cercopithecoids, related to large, elongate bilophodont molars, and the tendency
to increase relative jaw length across the range of anthropoid sizes, reflecting negative allometry of the brain (cranial
bicondylar width). We caution that various allometry and functional patterns may be masked by generalizing from broad taxonomic
comparison involving a large sweep of adaptative patterns. |
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Keywords: | Masticatory apparatus Primate dentition Mandible Allometry Regression Anthropoids |
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