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Range DescriptionAccording to van Roosmalen et al. (2002), Callicebus baptista has a disjunct distribution, occurring in central Brazilian Amazonia, south of the Rio Amazonas, east of the Rio Madeira in the state of Amazonas streching almost as far as the state of ParÃ¡, and north of the ParanÃ¡ do CanumÃ£, ParanÃ¡ do UrariÃ¡, and ParanÃ¡ do Ramos (van Roosmalen et al. 2002). It was first seen in the wild on the west (left) bank of the Rio UÃra-CurupÃ¡, and is believed to have crossed over the ParanÃ¡ do Ramos west of the town of Parintins forming an enclave population in the lower Rio UÃra-CurupÃ¡-AndirÃ¡ interfluve. Further surveys are rquired in this area to establish the exact range.
M.G.M. van Roosmalen (pers. comm.) has also observed populations of entirely pale yellowish to almost white colour morphs of Callicebus hoffmannsi along the Rio MamurÃº, one river further to the east, and classic yellowish-white and gray Callicebus hoffmannsi on both banks of the middle and upper Rio AndirÃ¡.