Samples of blood taken from 2.046 primates relocated by the "Curupira project" were examined for the presence of simian malaria parasites. This project aimed to rescuing the animals that lived within the forest that began to be flooded by the Tucurui dam built in the Tocantins river, Amazon basin, Brazil. Malaria parasites similar or identical to Plasmodium brasilianum were found in seven species or subspecies: Alouatta belzebul belzebul, A. belzebul nigerrima, A. seniculus, Chiropotes satanas, Saimiri sciureaus, Callicebus moloch and Saguinus midas niger. This last species was never reported infected with malaria parasites before.