The bluespotted corydoras, blacksail corydoras, blackspotted corydoras, dotted corydoras, Guiana cat, or Guiana corydoras, Corydoras melanistius, is a tropical freshwater fish belonging to the Corydoradinae sub-family of the Callichthyidae family. It originates in inland waters in South America, and is found in the coastal rivers of French Guiana, Guyana, and Suriname. It was originally described by C. Tate Regan in 1912. The specific epithet melanistius means black sail, referring to the dorsal fin. The bluespotted corydoras is of commercial importance in the aquarium trade industry.