rossoi, Rivulus Costa [W. J. E. M.] 2005:74, Fig. 5 [Neotropical Ichthyology v. 3 (no. 1); ref. 28192] Stream at road BR-060, 21.5 kilometers southwest from Campo Grande, Inhanduí drainage, rio Paraná basin, about 20°40'S, 54°40'W, Estado de Mato Grosso do Sul, Brazil, elevation about 500 meters. Holotype: UFRJ 5976. Paratypes: MCP 36122 (2); UFRJ 5923 (1), 5977 (7), 5978 (4, c&s). •Valid as Rivulus rossoi Costa 2005 -- (Costa 2006:162 [ref. 28875] in subgenus Melanorivulus). •Valid as Melanorivulus rossoi (Costa 2005) -- (Costa 2011:241 [ref. 31655], Volcan et al. 2018:280 [ref. 35895]). Current status: Valid as Melanorivulus rossoi (Costa 2005). Rivulidae: Rivulinae. Distribution: Inhanduí River drainage, Paraná River basin, Brazil. Habitat: freshwater.