Hisonotus montanus
Hisonotus montanus is a species of catfish in the family Loricariidae. It is known only from the Canoas [River (Santa Catarina)|Canoas River] drainage in Brazil and reaches 4.5 cm SL. The specific epithet of this fish, montanus, derives from its tendency to be found at altitudes of roughly 850 m or 2789 ft above sea level, marking it as the species of Hisonotus that occurs at the highest elevation of those native to the Uruguay River basin.