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Range DescriptionField research since the publications of Hershkovitz (1977) and Rylands et al. (1993) has diminished the supposed distribution of the SantarÃ©m marmoset. Hershkovitzâs (1977) range is now divided into four, being occupied by marmosets now considered distinct species: M. mauesi, M. saterei and M. acariensis besides M. humeralifer. According to our current understanding, M. humeralifer occurs south of the Rio Amazonas, between the Rio MauÃ©s (and possibly its tributary the Rio Parauari) in the west, and the Rio TapajÃ³s in the east. The southern limit is not known, but may be in the region of the Rio Paracari. The southernmost locality for the SantarÃ©m marmoset plotted by Hershkovitz (1977) was Vila Braga, 4Âº25'S, on the Transamazon highway, just north of the Amazonia National Park.