onca, Gymnotus Albert [J. S.] & Crampton [W. G. R.] 2001:256, Fig. 12 [Ichthyological Exploration of Freshwaters v. 12 (no. 3); ref. 25031] Cano do Lago Rato, Mamirauá Reserve, 3°02'36"S, 64°51'02"W, Amazonas, Brazil. Holotype (unique): INPA 11512. Type catalog: Ferraris et al. 2017:[19] [ref. 35236]. •Valid as Gymnotus onca Albert & Crampton 2001 -- (Crampton et al. 2003:2 [ref. 27064], Albert & Crampton 2003:3 [ref. 27077], Campos-da-Paz in Reis et al. 2003:485 [ref. 27061], Crampton & Albert 2003:2 [ref. 27433], Maldonado-Ocampo & Albert 2004:2 [ref. 27978], Crampton et al. 2005:99 [ref. 28092], Milhomem et al. 2012:804 [ref. 31815], Ferraris et al. 2017:[19] [ref. 35236], Craig et al. 2019:95 [ref. 37060] in subgenus Tigrinus). Current status: Valid as Gymnotus onca Albert & Crampton 2001. Gymnotidae: Gymnotinae. Distribution: Mamirauá Lake system, upper Amazon basin, Brazil. Habitat: freshwater.