polychromus, Melanorivulus Nielsen [D. T. B.], Aguiar Neves [P. A. B.], Ywamoto [E. V.] & de Aguiar Passos [M.] 2016:81, Figs. 1-2 [aqua, International Journal of Ichthyology v. 22 (no. 2); ref. 34407] São Paulo, Suzanápolis, Córrego Ranchiho, tributary of rio São José dos Dourados, rio Paraná basin, Brazil, 20°31'39.50"S, 51°03'06.64"W, altitude 337 meters. Holotype: MZUSP 119054. Paratypes: MZUSP. •Valid as Melanorivulus polychromus Nielsen, Aguiar Neves, Ywamoto & de Aguiar Passos 2016 -- (Volcan et al. 2017:92 [ref. 35156], Volcan et al. 2018:275 [ref. 35895], Ywamoto et al. 2020:128 [ref. 37763]). Current status: Valid as Melanorivulus polychromus Nielsen, Aguiar Neves, Ywamoto & de Aguiar Passos 2016. Rivulidae: Rivulinae. Distribution: Rio São José dos Dourados drainage, Rio Paraná basin, Brazil. Habitat: freshwater.