jacuiensis, Heterocheirodon Malabarba [L. R.] & Bertaco [V. A.] 1999:95, Figs. 3-5 [Comunicações do Museu de Ciências da PUCRS, Série Zoologia v. 12; ref. 24149] Lagoon at left margin of Rio Jacui, near bridge of road BR 290, Cachoeira do Sul, Brazil. Holotype: MCP 23670. Paratypes: MCP 9027 (3), 11279 (1, c&s), 11280 (1, c&s), 11283-84 (11, 16), 11358 (1), 11427 (1), 12203 (1), 19417 (39), 19505 (2), 19513 (2); MNRJ 18631 (25); MZUSP 18985 (25), 18993 (10); UFRGS 3825-26 (10, 9 [c&s]); USNM 356386 (25). •Valid as Heterocheirodon jacuiensis Malabarba & Bertaco 1999 -- (Malabarba in Reis et al. 2003:217 [ref. 27061], Litz & Koerber 2014:12 [ref. 33622], Bertaco et al. 2016:413 [ref. 34561], Loureiro et al. 2023:60 [ref. 40506]). Current status: Valid as Heterocheirodon jacuiensis Malabarba & Bertaco 1999. Characidae: Cheirodontinae. Distribution: South America: Laguna dos Patos drainage (Brazil and Uruguay). Habitat: freshwater.