nioni, Cynolebias Berkenkamp [H. O.], Reichert [J. J.] & Prieto [F.] 1997:30, Fig. [Aquaristik aktuell (Germany) v. 5 (no. 3); ref. 23147] Highway 26 at kilometer 331, 32°10'S, 55°15'E, Tacuarembó, northeastern Uruguay. Holotype: SMF 18457. Paratypes: MNHNM (5) and (6); SMF 18458-59 (4, 3). •Synonym of Austrolebias vazferreirai (Berkenkamp, Etzel, Reichert & Salvia 1994) -- (Costa 2006:34 [ref. 28708], Litz & Koerber 2014:31 [ref. 33622]). •Synonym of Austrolebias robustus (Günther 1883) -- (Koerber et al. 2017:7 [ref. 35083], Koerber et al. 2017:8 [ref. 35632]). •Valid as Austrolebias nioni (Berkenkamp, Reichert & Prieto 1997) -- (Costa 1998:75 [ref. 23792], Lazara 2001:62 [ref. 25711], Costa 2002:917 [ref. 26505], Calviño 2003:11 [ref. 26595], Costa in Reis et al. 2003:528 [ref. 27061], Costa et al. 2004:15 [ref. 27657], Nión et al. 2016:43 [ref. 35565]). •Synonym of Austrolebias cinereus (Amato 1986) -- (García et al. 2019:[9] [ref. 36487]). Current status: Synonym of Austrolebias cinereus (Amato 1986). Rivulidae: Cynolebiinae. Habitat: freshwater.