chacoensis, Cynolebias Amato [L. H.] 1986:10, Pl. 5 (fig. 8), Pl. 6 (fig. 9) [Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo v. 11 (no. 162); ref. 9170] Charca Topógrafo Acevedo, Nueva Asunción, Paraguay [ca. 21°00'S, 60°00'W]. Holotype: MHNM 2577. Paratypes: MHNM 2611-13 (1, 1, 3). Type catalog: Loureiro et al. 2016:412 [ref. 35150]. •Valid as Cynolebias chacoensis Amato 1986 -- (Costa 1995:55 [ref. 22097]). •Valid as Cynolebias ("Simpsonichthys") chacoensis Amato 1986 -- (Huber 1995:11 [ref. 22880]). •Valid as Simpsonichthys chacoensis (Amato 1986) -- (Costa 1996:130 [ref. 25271], Costa 1998:75 [ref. 23792], Lazara 2001:296 [ref. 25711], Costa in Reis et al. 2003:540 [ref. 27061], Costa 2006:17 [ref. 28620], Costa 2007:48 [ref. 29445], Costa & Brasil 2008:245 [ref. 29968]). •Valid as Spectrolebias chacoensis (Amato 1986) -- (Nielsen 2013:81 [ref. 32696], Nielsen & Brousseau 2013:116 [ref. 32794], Nielsen & Pillet 2015:186 [ref. 34009], Koerber et al. 2017:71 [ref. 35267], Costa & Amorim 2018:366 [ref. 36019]). Current status: Valid as Spectrolebias chacoensis (Amato 1986). Rivulidae: Cynolebiinae. Distribution: Paraguay River basin, Paraguay and Bolivia. Habitat: freshwater.