flexilis, Otocinclus Cope [E. D.] 1894:97, Pl. 8 [7] (figs. 13, 13a-b) [Proceedings of the American Philosophical Society v. 33; ref. 965] Rio Jacuhy [Jacuí], Rio Grande do Sul, Brazil. Lectotype: ANSP 21756. Paralectotypes: ANSP 21622-26 (5), 21757-67 (11). Type catalog: Böhlke 1984:122 [ref. 13621], Ferraris 2007:271 [ref. 29155]. Intended Pl. 7 was reversed with Pl. 8. Lectotype selected by Schaefer 1997:53 [ref. 23213]. •Valid as Macrotocinclus flexilis (Cope 1894) -- (Isbrücker et al. 2001:20 [ref. 25649], Isbrücker et al. 2001:30 [ref. 25653], Isbrücker 2002:23 [ref. 27178], Menni 2004:79 [ref. 28131], Ferraris 2007:271 [ref. 29155], Chiachio et al. 2008:610 [ref. 30127]). •Valid as Otocinclus flexilis Cope 1894 -- (Isbrücker 1980:82 [ref. 2303], Malabarba 1989:150 [ref. 14217], Burgess 1989:438 [ref. 12860], Schaefer 1991:6 [ref. 18926], Aquino 1994:218 [ref. 22311], Aquino 1996:13 [ref. 22664], Schaefer 1997:49 [ref. 23213], Gómez & Chebez 1996:62 [ref. 23791], Britto & Moreira 2002:1067 [ref. 26512], Britto et al. 2002:735 [ref. 26546], Schaefer in Reis et al. 2003:324 [ref. 27061], López et al. 2003:44 [ref. 27366], Axenrot & Kullander 2003:256 [ref. 27393], Lehmann A. et al. 2010:60 [ref. 30756], Koerber 2011:5 [ref. 31122], Litz & Koerber 2014:24 [ref. 33622], Bertaco et al. 2016:419 [ref. 34561], Nión et al. 2016:31 [ref. 35565], Delapieve et al. 2018:23 [ref. 35713], Loureiro et al. 2023:117 [ref. 40506]). Current status: Valid as Otocinclus flexilis Cope 1894. Loricariidae: Hypoptopomatinae. Distribution: South America: Rio Jacuí, Laguna dos Patos system, Rio Grande do Sul (Brazil) and Uruguay. Habitat: freshwater.