cuia, Gymnotus Craig [J. M.], Malabarba [L. R.], Crampton [W. G. R.] & Albert [J. S.] 2018:55, Figs. 7, 9B-C [Zootaxa 4379 (no. 1); ref. 35800] Lagoa Verde, Itapuã State Park, Viamão, Lagoa, Rio Grande do Sul, Brazil, 30°22'52"S, 51°01'25"W. Holotype: UFRGS 23700. Paratypes: UFRGS. Plus additional non-type material. •Valid as Gymnotus cuia Craig, Malabarba, Crampton & Albert 2018 -- (Koerber et al. 2019:9 [ref. 36736], Craig et al. 2019:41 [ref. 37060] in subgenus Gymnotus, Koerber et al. 2020:5 [ref. 37480], Mirande & Koerber 2020:2 [ref. 37594], Koerber et al. 2021:5 [ref. 38894], Koerber et al. 2023:5 [ref. 40355], Loureiro et al. 2023:80[90] [ref. 40506]). Current status: Valid as Gymnotus cuia Craig, Malabarba, Crampton & Albert 2018. Gymnotidae: Gymnotinae. Distribution: South America: Paraná River and Uruguay River basins (Brazil, Paraguay, Uruguay and Argentina). Habitat: freshwater.