gigas, Chaetostomus Boulenger [G. A.] 1895:526 [Proceedings of the Zoological Society of London 1895 (pt 3); ref. 14576] Paraguay. Holotype (unique): BMNH 1895.5.17.72. Type catalog: Ferraris 2007:272 [ref. 29155]. Original genus is correctly Chaetostoma. •Valid as Megalancistrus gigas (Boulenger 1895) -- (Isbrücker 1980:52 [ref. 2303], Burgess 1989:434 [ref. 12860]). •Synonym of Megalancistrus parananus (Peters 1881) -- (Isbrücker 2001:26 [ref. 25653], Isbrücker 2002:14 [ref. 27178], Fisch-Muller in Reis et al. 2003:390 [ref. 27061], Ferraris 2007:272 [ref. 29155], Litz & Koerber 2014:25 [ref. 33622], Mirande & Koerber 2015:42 [ref. 35117], Koerber et al. 2017:64 [ref. 35267]). Current status: Synonym of Megalancistrus parananus (Peters 1881). Loricariidae: Hypostominae. Habitat: freshwater.