prognathus, Anacyrtus Boulenger [G. A.] 1895:529 [Proceedings of the Zoological Society of London 1895 (pt 3); ref. 14576] Paraguay. Holotype (unique): BMNH 1895.5.17.238. •Valid as Roeboides prognathus (Boulenger 1895) -- (Lucena 1988:37 [ref. 22126], Gómez & Chebez 1996:47 [ref. 23791], Britski et al. 1999:55 [ref. 24147], Lucena 2000:155 [ref. 25162], Lucena & Menezes in Reis et al. 2003:206 [ref. 27061], López et al. 2003:17 [ref. 27366], Menni 2004:74 [ref. 28131], Nión et al. 2016:28 [ref. 35565]). •Synonym of Roeboides affinis (Günther 1868) -- (Lucena 2007:119 [ref. 29256], Koerber 2014:3 [ref. 33621], Litz & Koerber 2014:11 [ref. 33622], Mirande & Koerber 2015:18 [ref. 35117], Koerber et al. 2017:29 [ref. 35267]). Current status: Synonym of Roeboides affinis (Günther 1868). Characidae: Characinae. Distribution: Paraguay, middle and lower Paraná, and Uruguay River basins: Argentina, Brazil, Paraguay and Uruguay [if valid]. Habitat: freshwater.