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Range DescriptionThe ManicorÃ© Marmoset is known from the west bank of the lower Rio AripuanÃ£ from the mouth, west as far as the Rio ManicorÃ©, south towards its headwaters. Despite the map provided by Van Roosmalen et al. (2000), it evidently does not reach the confluence with the Rio Rooseveltâthe type locality of M. marcai. The southern limits are probably marked by the headwaters of the Rio MataurÃ¡ or Rio ArauÃ¡, about 7ÂºS.