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We report the first Brazilian record of Leiostracus demerarensis (L. Pfeiffer, 1861) from Pará and Maranhão states. The distribution of this species now comprises Guyana, Suriname, French Guiana, and northern Brazil. Furthermore, given the uncertainty in generic and familial allocation of this species (either Bostryx Troschel, 1847, Bulimulidae, or Leiostracus Albers, 1850, Simpulopsidae), we used the barcoding segment of the COI gene to ascertain its classification in Simpulopsidae, retaining it as Leiostracus demerarensis. Moreover, Simpulopsis luteolus (Ancey, 1901) is also reported for the first time from Pará state.