laevior, Hisonotus Cope [E. D.] 1894:95, Pl. 8 [7] (figs. 12, 12a-b) [Proceedings of the American Philosophical Society v. 33; ref. 965] Rio Jacuhy [Jacuí] , Rio Grande do Sul, Brazil. Holotype (unique): ANSP 21563. Type catalog: Böhlke 1984:123 [ref. 13621], Ferraris 2007:248 [ref. 29155]. •Valid as Otocinclus laevior (Cope 1894) -- (Isbrücker 1980:83 [ref. 2303], Burgess 1989:438 [ref. 12860]). •Valid as Microlepidogaster laevior (Cope 1894) -- (Malabarba 1989:149 [ref. 14217]). •Valid as Hisonotus laevior Cope 1894 -- (Isbrücker 2001:28 [ref. 25653], Aquino et al. 2001:9 [ref. 25673], Isbrücker 2002:17 [ref. 27178], Schaefer in Reis et al. 2003:322 [ref. 27061], Almirón & Azpelicueta 2006:93 [ref. 28713], Casciotta et al. 2006:150 [ref. 28758], Britski & Garavello 2007:414 [ref. 29429], Ferraris 2007:248 [ref. 29155], Carvalho et al. 2008:515 [ref. 29799], Garvalho & Reis 2011:12 [ref. 31240], Roxo et al. 2015:138 [ref. 33763], Zawadzki et al. 2016:380 [ref. 34367], Roxo et al. 2016:236 [ref. 34426], Bertaco et al. 2016:418 [ref. 34561], Calegari et al. 2017:243 [ref. 35203], Roxo et al. 2018:[12] [ref. 35900], Giora & Wingert 2023:45 [ref. 41026]). Current status: Valid as Hisonotus laevior Cope 1894. Loricariidae: Hypoptopomatinae. Distribution: Jacuí River basin, Brazil. Habitat: freshwater.