inaequipinnatus, Simpsonichthys Costa [W. J. E. M.] & Brasil [G. C.] 2008:246, Figs. 1-2 [Ichthyological Exploration of Freshwaters v. 19 (no. 3); ref. 29968] Seasonal pool in the right bank floodplains of the Tocantins River, 5°20'12"S, 47°51'36"W, Município de Cidelândia, Estado do Maranhão, Brazil. Holotype: UFRJ 6617. Paratypes: UFRJ 6618 (7), 6619 (2, c&s). •Valid as Simpsonichthys inaequipinnatus Costa & Brasil 2008. •Valid as Spectrolebias inaequipinnatus (Costa & Brazil 2008) -- (Nielsen 2013:81 [ref. 32696], Nielsen & Brousseau 2013:116 [ref. 32794], Costa & Amorim 2018:365 [ref. 36019], Koerber et al. 2022:76 [ref. 39235]). Current status: Valid as Spectrolebias inaequipinnatus (Costa & Brasil 2008). Rivulidae: Cynolebiinae. Distribution: South America: Tocantins River basin (northeastern Brazil). Habitat: freshwater.