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Abstract
Among the species belonging to the genus Macrobrachium Spence Bate, 1868, M. carcinus
(Linnaeus, 1758) and M. olfersii (Wiegmann, 1836) are geographically widespread in
the western Atlantic from the Gulf Coast to southern Brazil. We describe the current
geographic distribution of M. carcinus and M. olfersii and include records of these
species in the state of Maranhão, Brazil.