cyanopterus, Rivulus Costa [W. J. E. M.] 2005:73, Figs. 3-4 [Neotropical Ichthyology v. 3 (no. 1); ref. 28192] Jaciara, swamp close to rio Tenente Amaral, tributary to upper rio São Lourenço, rio Paraguay basin, 15°58;48.9"S, 54°57'20.0"W, elevation 246 meters. Holotype: UFRJ 5911. Paratypes: MCP 36121 (8); UFRJ 5912 (3), 5913 (36), 5914 (5, c&s). •Valid as Rivulus cyanopterus Costa 2005 -- (Costa 2006:162 [ref. 28875] in subgenus Melanorivulus). •Valid as Melanorivulus cyanopterus (Costa 2005) -- (Costa 2011:241 [ref. 31655], Costa 2017:68 [ref. 35046], Deprá et al. 2017:121 [ref. 35503]). Current status: Valid as Melanorivulus cyanopterus (Costa 2005). Rivulidae: Rivulinae. Distribution: Upper Sao Lourenço River drainage, Paraguay River basin, Brazil. Habitat: freshwater.