Abstract
On the basis of taxonomic, ecological and geological data, a hypothesis is presented on the trends of evolutionary radiation of the Tonkin leafmonkey (Presbytis francoisi). The ancestral form was mainly black likeP. f. hatinhensis and located in the limestone hilly regions of Northern Annam. The range expanded at the end of the upper Pleistocene, and subspeciation occurred at the beginning of the recent epoch (about 9000 years ago). The direction of evolution of this leafmonkey was northeastwards, and the trend of colour change was the progressive whitening of the black body adapted to the more or less denuded rocky substrate.
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Van Tien, D. On the trends of the evolutionary radiation on the Tonkin leafmonkey (Presbytis francoisi, primates: cercopithecidae). Hum. Evol. 4, 501–507 (1989). https://doi.org/10.1007/BF02436297
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DOI: https://doi.org/10.1007/BF02436297