Platynematichthys notatus, the coroatá or striped catfish, is a species of catfish of the monotypic genus Platynematichthys of the family Pimelodidae. It is native to the Amazon and Orinoco Basins in South America. In the Orinoco this distinctly spotted species reaches up to 1 m (3.3 ft) in standard length, but it reportedly only reaches about half that size in the Amazon.