nigrovittatus, Cynopoecilus Costa [W. J. E. M.] 2002:20, Fig. 5 [Ichthyological Exploration of Freshwaters v. 13 (no. 1); ref. 26061] Rio Caí flood-plains, about 29°45'S, 51°30'W, Montenegro, Rio Grande do Sul, Brazil. Holotype: MCP 26931. Paratypes: MCP 26932 (10); UFRJ 4820 (30), 4829 (43), 4976 (45), 4977 (23), 5012 (6, 2 c&s), 5039 (46), 5231 (6, 2 c&s). •Valid as Cynopoecilus nigrovittatus Costa 2002 -- (Costa in Reis et al. 2003:530 [ref. 27061], Ferrer et al. 2014:847 [ref. 33589], Costa et al. 2016:5 [ref. 34354], Bertaco et al. 2016:424 [ref. 34561], Costa 2016:130 [ref. 34776], Garcez et al. 2020:[3] [ref. 37602], Giora & Wingert 2023:28 [ref. 41026]). Current status: Valid as Cynopoecilus nigrovittatus Costa 2002. Rivulidae: Cynolebiinae. Distribution: South America: Lower Jacui River basin, Laguna dos Patos system (Brazil). Habitat: freshwater.