formosensis, Rivulus Costa [W. J. E. M.] 2008:86, Figs. 1-2 [Ichthyological Exploration of Freshwaters v. 19 (no. 1); ref. 29717] Formoso River floodplains near Santa Amélia farm, upper Corrente River drainage, a part of the Paranaíba River drainage, Município de Chapadão do Céu, Estado de Goiás, Brazil. Holotype: UFRJ 6543. Paratypes: UFRJ 6544 (9), 6545 (4, 2 c&s), 5387 (2). •Valid as Melanorivulus formosensis (Costa 2008) -- (Nielsen et al. 2016:87 [ref. 34407], Volcan et al. 2017:92 [ref. 35156], Costa 2018:25 [ref. 35717], Volcan et al. 2018:275 [ref. 35895]). Current status: Valid as Melanorivulus formosensis (Costa 2008). Rivulidae: Rivulinae. Distribution: Formoso River floodplains, upper Corrente River drainage, upper Paraná River basin, central Brazil. Habitat: freshwater.