Otothyropsis dialeukos is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Hypoptopomatinae, the cascudinhos. This catfish is known only from its type locality of Arroyo Ita, a tributary to the Embalse de Acaray in the upper Paraná River basin in Paraguay. This species reaches a standard length of .
References