litteratus, Rivulus Costa [W. J. E. M.] 2005:75, Figs. 6-7 [Neotropical Ichthyology v. 3 (no. 1); ref. 28192] Município de Alto córrego do Sapo, upper rio Araguaia basin, road MT-100, 31 kilometers south of Alto Araguaia, 17°33'38.5"S, 53°18'33"W, Estado de Mato grosso, Brazil, elevation 750 meters. Holotype: UFRJ 5956. Paratypes: MCP 36123 (10); MZUSP 73303 (15); UFRJ 5837 (41), 5957 (7), 5958 (6, c&s). •Valid as Rivulus litteratus Costa 2005 -- (Costa 2006:162 [ref. 28875] in subgenus Melanorivulus, Costa 2006:55 [ref. 28876], Costa 2008:85 [ref. 29717]). •Valid as Melanorivulus litteratus (Costa 2005) -- (Costa 2011:241 [ref. 31655], Costa 2012:217 [ref. 32292], Nielsen et al. 2016:87 [ref. 34407], Costa et al. 2016:270 [ref. 35405], Volcan et al. 2018:275 [ref. 35895]). Current status: Valid as Melanorivulus litteratus (Costa 2005). Rivulidae: Rivulinae. Distribution: Upper Araguaia River drainage, Brazil. Habitat: freshwater.