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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.

First record of Leiostracus demerarensis (L. Pfeiffer, 1861) from Brazil (Gastropoda, Orthalicoidea), with a taxonomic reassessment