Harttia guianensis is a species of armored catfish endemic to French Guiana where it is found in the Sinnamary and Approuague River basins. This species grows to a length of SL. References guianensis Catfish of South America Fish of French Guiana Endemic fauna of French Guiana Taxa named by Lúcia Helena Rapp Py-Daniel Taxa named by Edinbergh Caldas de Oliveira Fish described in 2001