Hisonotus armatus Carvalho, Lehmann A., Pereira & Reis 2008

Distinguished from all other species of Hisonotus, except Hisonotus notatus and Hisonotus leucofrenatus, by having anterior margin of the snout completely covered byodontodes vs. with a narrow or wide odontode-free; large plates in the abdominal median series, usually comprising one series of plates between the lateral abdominal plates vs. abdominal median series of plates small, with several plate series irregularly arrangedbetween the lateral abdominal ones. Can be differentiated from Hisonotus notatus and Hisonotus leucofrenatus in the presence on the caudal fin of a series of light hyaline spots, forming a vertical light bar, vs. a rounded hyaline blotch or no hyaline area in the midventral portion of caudal fin (Ref. 78747).Description: Dorsal fin with seven branched rays; anal fin with five branched rays; pectoral fin with six unbranched rays; pelvic fin with five branched rays (Ref. 78747).

Occurs in slow to moderate flowing watercourses, with clear to brown water over sandy bottom and in marginal or submerged aquatic vegetation. Sympatric with Hisonotus laevior throughout its distribution (Ref. 78747).

Hisonotus armatus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Lagoa dos Patos basin in Brazil. The species is found in slow and moderate-flowing waters over sandy substrates with submerged or marginal vegetation. It reaches 6 cm (2.4 inches) in total length and is noted to be sympatric with the species Hisonotus laevior throughout its distribution.