spixi, Melanorivulus Costa [W. J. E. M.] 2016:132, Fig. 20 [Ichthyological Exploration of Freshwaters v. 27 (no. 2) for Oct.; ref. 34900] Swamp close to road MT-240, 7 km east of Água Boa, between Água Boa and road MT-100, Município de Água Boa, Mato Grosso, Brazil, 14°01'00"S, 52°05'48"W, elevation about 480 meters. Holotype: UFRJ 6869. Paratypes: UFRJ. Plus additional non-type material. •Valid as Melanorivulus spixi Costa 2016 -- (Nielsen 2017:66 [ref. 35340], Nielsen & Britzke 2019:41 [ref. 36525]). Current status: Valid as Melanorivulus spixi Costa 2016. Rivulidae: Rivulinae. Distribution: Rio Araguaia drainage, Brazil. Habitat: freshwater.