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Range DescriptionAlouatta nigerrima occurs south of the Rio Amazonas in Brazil, west from the rios TapajÃ³s and Juruena, to the Rios Madeira and AripuanÃ£, to about 9ÂºS. There are outlying populations north of the Rio Amazonas in the region of OriximinÃ¡ and Ãbidos on the lower Rio Trombetas (Napier, 1976) and just south of the Rio Amazonas-SolimÃµes, midway between the rios Maderia and Purus, at the Lago JanauacÃ¡ (A. Rylands, pers. obs.; Langguth et al. 1987; Bonvincino et al. 1989; Gregorin 2006).