lacustris, Gymnogeophagus Reis [R. E.] & Malabarba [L. R.] 1988:282, Fig. 24 [Revista Brasileira de Zoologia v. 4 (no. 4); ref. 6638] Canal between Lagoa da Cerquinha and Lagoa da Rondinha, Pinhal, Tramandai, Rio Grande do Sul State, Brazil. Holotype: MZUSP 28462. Paratypes: USNM 270289 (1); MCP 8664-73 (10), 8676-8 (3), 8412 (1); MAPA 2216-23 (3, 1, 1, 1, 4, 3, 1, 1); DZUFRGS 1010-1 (1, 1), 1017 (1), 3171 (1); NRM 18007 (1) •Valid as Gymnogeophagus lacustris Reis & Malabarba 1988 -- (Wimburger et al. 1998:513 [ref. 23857], Kullander in Reis et al. 2003:635 [ref. 27061], Staeck 2006:104 [ref. 29421], Malabarba et al. 2015:660 [ref. 34105], Bertaco et al. 2016:426 [ref. 34561], Figueiredo et al. 2021:6 [ref. 38935]). Current status: Valid as Gymnogeophagus lacustris Reis & Malabarba 1988. Cichlidae: Cichlinae. Distribution: South America: coastal drainages in Rio Grande do Sul State (Brazil). Habitat: freshwater.