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Range DescriptionCentral Amazon, south of the Rio Amazonas. In the original description, the MauÃ©s Marmoset was known only from the immediate vicinity of the type locality, but local people informed that it occurred along the Rio MauÃ©s to the south of the type locality and to the west as far as the ParanÃ¡ UrariÃ¡ and Rio Abacaxis. Silva Jr. and Noronha (1995) reported a further locality: Santa Maria, on the right of the lower Rio Abacaxis, municipality of Nova Olinda do Norte, state of Amazonas (3Âº54'S, 58Âº46'W). They also obtained reports of M. mauesi occurring in the vicinity of the town of Abacaxis, right bank of the Rio Abacaxis (3Âº55'S, 58Âº45'W) a few kilometers downriver from Santa Maria. It was reported not to occur at SÃ£o JoÃ£o on the left bank of the Rio Marimari, near its confluence with the Rio Abacaxis (3Âº57'S, 58Âº48'W), nor at two other localities on the west bank of the Rio Abacaxis. Silva Jr. and Noronha (1995) reported the occurrence of a bare-eared marmoset on the west bank of the Rio Abacaxis, which they later described (1998) as Callithrix saterei.
A recent survey has increased further still the range of M. mauesi, at the expense of M. humeralifer.