wallacei, Melanorivulus Costa [W. J. E. M.] 2016:140, Fig. 26 [Ichthyological Exploration of Freshwaters v. 27 (no. 2) for Oct.; ref. 34900] Stream tributary of the Rio Joao Aires, road TO-010, Rio Tocantins drainage, Município de Palmeirante, Tocantins, Brazil, 7°46'15"S, 48°03'31"W, elevation about 210 meters. Holotype: UFRJ 6871. Paratypes: UFRJ. Plus additional non-type material. •Valid as Melanorivulus wallacei Costa 2016 -- (Nielsen 2017:66 [ref. 35340], Nielsen & Britzke 2019:42 [ref. 36525]). Current status: Valid as Melanorivulus wallacei Costa 2016. Rivulidae: Rivulinae. Distribution: Middle Tocantins river drainage, Brazil. Habitat: freshwater.