jacuiensis, Oligosarcus Menezes [N. A.] & Ribeiro [A. C.] 2010:650, Figs. 1-2a [Neotropical Ichthyology v. 8 (no. 3); ref. 30976] Estrela Velha, rio Jacuí, 29°15'46"S, 53°14'05"W, Rio Grande do Sul, Brazil. Holotype: MCP 28980. Paratypes: MCP 18876 (6), 26979 (13), 37930 (4), 44405 (8); MZUSP 104604 (4). •Valid as Oligosarcus jacuiensis Menezes & Ribeiro 2010 -- (Ribeiro & Menezes 2015:77 [ref. 33768], Menezes & Ribeiro 2015:545 [ref. 33973], Bertaco et al. 2016:414 [ref. 34561], Wendt et al. 2019:5 [ref. 36952]). Current status: Valid as Oligosarcus jacuiensis Menezes & Ribeiro 2010. Characidae: Stethaprioninae. Distribution: South America: Uruguay and Jacuí river basins, southern Brazil. Habitat: freshwater.