parananus, Pterygoplichthys (Ancistrus) Peters [W. (C. H.)] 1881:17 [Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 1881 (no. 2) (for 15 Feb. 1881); ref. 18546] Río Paraná at La Paz, Entre-Ríos, Argentina. Holotype (unique): ZMB 11328. Type catalog: Ferraris 2007:272 [ref. 29155]. •Valid as Pterygoplichthys parananus Peters 1881 -- (Isbrücker 1980:42 [ref. 2303], Burgess 1989:433 [ref. 12860]). •Valid as Megalancistrus parananus (Peters 1881) -- (Isbrücker et al. 2001:30, 32 [ref. 25653], Isbrücker 2002:23 [ref. 27178], Fisch-Muller in Reis et al. 2003:390 [ref. 27061], López et al. 2003:53 [ref. 27366], Menni 2004:81 [ref. 28131], Ferraris 2007:272 [ref. 29155], Litz & Koerber 2014:25 [ref. 33622], Mirande & Koerber 2015:42 [ref. 35117], Bertaco et al. 2016:419 [ref. 34561], Nión et al. 2016:32 [ref. 35565], Koerber et al. 2017:64 [ref. 35267], Reis et al. 2020:467 [ref. 38364], Loureiro et al. 2023:113 [ref. 40506]). Current status: Valid as Megalancistrus parananus (Peters 1881). Loricariidae: Hypostominae. Distribution: South America: Paraguay, Paraná and Uruguay River basins (Argentina, Brazil, Paraguay and Uruguay). Habitat: freshwater.