rutilicaudus, Rivulus Costa [W. J. E. M.] 2005:77, Figs. 8-9 [Neotropical Ichthyology v. 3 (no. 1); ref. 28192] Município de Serranópolis, rio Verde floodplains, rio Paraná basin, road BR-060, 18°22'31.5"S, 52°00'59.5"W, Estafo de Goiás, Brazil, elevation 531 meters. Holotype: UFRJ 5965. Paratypes: MCP 36124 (2); UFRJ 5966 (11), 5967 (3, c&s). Plus non-type specimens. •Valid as Rivulus rutilicaudus Costa 2005 -- (Costa 2006:162 [ref. 28875] in subgenus Melanorivulus, Costa 2008:86 [ref. 29717], Costa 2010:197 [ref. 31043]). •Valid as Melanorivulus rutilicaudus (Costa 2005) -- (Costa 2011:241 [ref. 31655], Nielsen et al. 2016:87 [ref. 34407], Costa et al. 2016:270 [ref. 35405], Volcan et al. 2017:92 [ref. 35156], Costa 2018:25 [ref. 35717], Volcan et al. 2018:275 [ref. 35895]). Current status: Valid as Melanorivulus rutilicaudus (Costa 2005). Rivulidae: Rivulinae. Distribution: Verde River floodplains, Paraná River basin, Goiás, Brazil. Habitat: freshwater.