megaloplax, Hisonotus Carvalho [T. P.] & Reis [R. E.] 2009:18, Figs. 5C, 6C, 11, 12 [Zootaxa No. 2113; ref. 30193] Arroio Caraguatá on secondary road to highway BR-153 between Passo Fundo and Ipiranga, 28°07'55"S, 52°20'56"W, Coxilha, Rio Grande do Sul, Brazil. Holotype: MCP 42577. Paratypes: ANSP 187474 (4); MCP 31765 (2), 31779 (9 + 3 c&s), 41352 (6) •Valid as Hisonotus megaloplax Carvalho & Reis 2009 -- (Garvalho & Reis 2011:35 [ref. 31240], Roxo et al. 2015:138 [ref. 33763], Zawadzki et al. 2016:381 [ref. 34367], Roxo et al. 2016:236 [ref. 34426], Bertaco et al. 2016:418 [ref. 34561], Calegari et al. 2017:244 [ref. 35203], Roxo et al. 2018:[12] [ref. 35900], Dias et al. 2018:583 [ref. 36235]). Current status: Valid as Hisonotus megaloplax Carvalho & Reis 2009. Loricariidae: Hypoptopomatinae. Distribution: Rio Passo Fundo drainage, upper rio Uruguay basin, Brazil. Habitat: freshwater.