Hisonotus yasi is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armoured catfishes, and the subfamily Hypoptopomatinae, the cascudinhos. This catfish is found in the drainage system of the Iguazu River in Argentina and Brazil.
References
López, H.L., A.M. Miquelarena and J. Ponte Gómez, 2005. Biodiversidad y distribución de la ictiofauna Mesopotámica. Miscelánea 14:311-354.