Two new foci of transmission of Schistosoma mansoni in the state of Pará are recorded, with the finding of naturally infected Biomphalaria glabrata in the municipalities of Viseu and Belém. Uninfected specimens of Biomphalaria straminea, as well as the planorbid species Biomphalaria schrammi, Drepanotrema lucidum and D. anatinum, were found in the same area.