Sexual dimorphism in canine length of woolly spider monkeys (Brachyteles arachnoides,E. Geoffroy 1806) |
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Authors: | Rosa M Lemos de Sá Theresa R Pope Thomas T Struhsaker Kenneth E Glander |
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Institution: | (1) Department of Wildlife and Range Sciences, University of Florida, 32611 Gainesville, Florida;(2) Department of Biological Anthropology and Anatomy, Duke University, 27706 Durham, North Carolina |
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Abstract: | We measured canine teeth from 28 woolly spider monkeys (Brachyteles arachnoides) to assess sexual dimorphism and population differences. The specimens are from the Brazilian states of Bahia, Minas Gerais, Espírito Santo, Rio de Janeiro, and São Paulo. We found strong sexual dimorphism in canine length for individuals belonging to populations south of 22°00 latitude but no sexual dimorphism in canine length from individuals of populations north of 21°00 latitude. Canine length did not vary among females of northern and southern populations. However, southern males had significantly longer canines than northern males. This geographical difference in canine morphology, together with the presence or absence of thumbs and published accounts of differences in genetics and social structure between northern and southern populations, suggests thatBrachyteles arachnoides may be composed of at least two subspecies, which appear to be separated by the rivers Grande and Paraiba do Sul and the Serra da Mantiqueira. |
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Keywords: | Brachyteles canine sexual dimorphism subspecies |
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