Examinando-se o sangue de 2.046 primatas capturados durante a "Operação Curupira" encontraram-se plasmódios semelhantes ao Plasmodium brasilianum em sete espécies ou subespécies: Alouatta belzebul belzebul, Alouatta belzebul nigerrima, Alouatta seniculus, Chiropotes satanas, Callicebus moloch, Saimiri sciureus e Saguinus midas niger. Esta última espécie havia sido ainda encontrada naturalmente parasitada por plasmódios.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.