Freshwater prawns are distributed in rivers and streams of inland and brackish waters throughout America.In Brazilian waters are registered 35 species into 4 families (Atyidae, Euryrhynchidae, Palaemonidae, and Sergestidae).Information about the geographic distribution of this fauna is scattered in the literature and frequently not founded ondocumented data in scientific collections. Here we examined a series of specimens and detected several new recordsand extension of the known distribution of some freshwater shrimps in Brazil.