dimerus, Acara Heckel [J. J.] 1840:351 [Annalen des Wiener Museums der Naturgeschichte v. 2; ref. 2064] Rio Cuiabá, Mato Grosso State, Brazil. Holotype: NMW 33620. •Valid as Cichlasoma dimerus (Heckel 1840) -- (Kullander 1983:193 [ref. 8319], Gómez & Chebez 1996:65 [ref. 23791], Britski et al. 1999:151 [ref. 24147], Kullander in Reis et al. 2003:622 [ref. 27061], López et al. 2003:75 [ref. 27366], Casciotta et al. 2003:158 [ref. 28130], Menni 2004:87 [ref. 28131], Ottoni 2011:336 [ref. 31675], Litz & Koerber 2014:33 [ref. 33622], Sarmiento et al. 2014:189 [ref. 35004], Mirande & Koerber 2015:56 [ref. 35117], Bertaco et al. 2016:425 [ref. 34561], Nión et al. 2016:50 [ref. 35565] with author as Heckel 1840, Koerber et al. 2017:77 [ref. 35267], DoNascimiento et al. 2017:[29] [ref. 35679], Dickens 2019:169 [ref. 37135], Hablützel & Huanto 2020:52 [ref. 37939], Reis et al. 2020:472 [ref. 38364], Loureiro et al. 2023:159 [ref. 40506]). Current status: Valid as Cichlasoma dimerus (Heckel 1840). Cichlidae: Cichlinae. Distribution: South America: Paraná and Paraguay River basins (Argentina, Brazil, Bolivia, Paraguay and Uruguay). Habitat: freshwater.