melanocheilus, Loricariichthys Reis [R. E.] & Pereira [E. H. L.] 2000:1042, Fig. 9 [Copeia 2000 (no. 4); ref. 25021] Mouth of rio Ijuí-Mirim, tributary of rio Ijuí, Pirapó, Rio Grande do Sul, río Uruguay drainage, 28°03'S, 55°11'W, Brazil. Holotype: MCP 16961. Paratypes: MACN 7941 (3); MCP 11782 (1), 12389 (1), 12446 (1), 13030 (2), 13229 (5), 13517 (2), 13521 (2), 14276 (6), 15381 (3); MLP 9097 (3); MZUSP 41012 (2), 46769 (5). Type catalog: Ferraris 2007:271 [ref. 29155], Miquelarena & Nadalin 2014:13 [ref. 33466]. •Valid as Loricariichthys melanocheilus Reis & Pereira 2000 -- (Isbrücker et al. 2001:30 [ref. 25653], Isbrücker 2002:23 [ref. 27178], Ferraris in Reis et al. 2003:339 [ref. 27061], López et al. 2003:46 [ref. 27366], Menni 2004:81 [ref. 28131], Ferraris 2007:271 [ref. 29155], Litz & Koerber 2014:26 [ref. 33622], Mirande & Koerber 2015:45 [ref. 35117], Bertaco et al. 2016:419 [ref. 34561], Nión et al. 2016:31 [ref. 35565], Loureiro et al. 2023:96 [ref. 40506]). Current status: Valid as Loricariichthys melanocheilus Reis & Pereira 2000. Loricariidae: Loricariinae. Distribution: South America: lower Paraná and Uruguay River basins (Argentina, Brazil and Uruguay). Habitat: freshwater.