Hisonotus montanus Carvalho & Reis 2009

Hisonotus montanus can be distinguished from other congeners, except Hisonotus aky and Hisonotus iota by having an infraorbital canal entering the infraorbital series via the compound pterotic vs.infraorbital canal entering the infraorbital series via the sphenotic. It is distinguished from Hisonotus aky and Hisonotus iota by having wider light stripes on the dorsal surface of head extending from snout tip to posterior end of compound pterotic, and by the presence of white marks on dorsal surface of head vs. narrow light stripes on dorsal surface of head extending from snout tip to posterior end of compound pterotic, and absence of white marks on dorsal surface of head (Ref. 80996).

Dorsal spines (total): 2; Dorsal soft rays (total): 7; Anal spines: 1; Analsoft rays: 5

Inhabits median flow watercourses, with clear waters ofsandy and rocky bottom and is found associated with marginal vegetation composed mainly of grass. Hisonotus montanus is found at high altitudes, about 850 m above the sea level, and represents the species of Hisonotus occurring in the most elevated portions of the rio Uruguai basin (Ref. 80996).

Hisonotus montanus is found at high altitudes, about 850 m above the sea level, and represents the species ofHisonotus occurring in the most elevated portions of the rio Uruguai basin (Ref. 80996).

Hisonotus montanus is a species of catfish in the family Loricariidae. It is known only from the Canoas River drainage in Brazil and reaches 4.5 cm (1.8 inches) 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.