nielseni, Simpsonichthys Costa [W. J. E. M.] 2005:58, Figs. 1-2 [Zootaxa No. 1039; ref. 28575] Temporary pool in Pirapora, São Francisco Rver floodplains, 17°21'59.6"S, 44°56'32.3"W, Estado de Minas Gerais, Brazil, elevation 500 meters. Holotype: UFRJ 6060. Paratypes: MCP 37306 (2); UFRJ 6061 (7), 6062 (5, c&s). •Valid as Simpsonichthys nielseni Costa 2005 -- (Costa 2006:17 [ref. 28620], Costa 2007:64 [ref. 29445]). •Valid as Hypsolebias nielseni (Costa 2005) -- (based on generic placement in Costa 2011 [ref. 31654]). Current status: Valid as Hypsolebias nielseni (Costa 2005). Rivulidae: Cynolebiinae. Distribution: Middle São Francisco River floodplains, Minas Gerais State, Brazil. Habitat: freshwater.