kayapo, Rivulus Costa [W. J. E. M.] 2006:50, Figs. 1-2 [Zootaxa No. 1368; ref. 28876] Stream near kilometer 52 of road GO-221, Rio Bonito drainage, upper Rio Caiapó basin (itself part of araguaia basin), Estado de Goiás, Brazil, 16°41'52.4"S, 51°25'13.6"W, elevation 685 meters. Holotype: UFRJ 6380. Paratypes: MCP 40140 (3); UFRJ 6381 (12), 6382 (5, c&s). •Valid as Rivulus kayapo Costa 2006 -- (Costa 2008:85 [ref. 29717]). •Valid as Melanorivulus kayapo (Costa 2006) -- (Costa 2011:241 [ref. 31655], Costa 2012:217 [ref. 32292], Nielsen et al. 2016:87 [ref. 34407], Costa et al. 2016:270 [ref. 35405]). Current status: Valid as Melanorivulus kayapo (Costa 2006). Rivulidae: Rivulinae. Distribution: Upper Araguaia River basin, Goiás, Brazil. Habitat: freshwater.