prognathus, Cynolebias Amato [L. H.] 1986:7, Pl. 4 (fig. 7) [Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo v. 11 (no. 162); ref. 9170] Floodlands of Maravillas, 13 kilometers from route 9, La Coronilla, Rocha, Uruguay. Holotype: MHNM 2609 [not 2577 on Pl. 4]. Paratypes: MHNM 2446 (1), 2598 (2), 2605 (9). Type catalog: Loureiro et al. 2016:413 [ref. 35150]. •Valid as Cynolebias prognathus Amato 1986 -- (Malabarba 1989:159 [ref. 14217], Costa 1995:76 [ref. 22097], Berkenkamp et al. 1997:33 [ref. 23147]). •Valid as Megalebias prognathus (Amato 1986) -- (Costa 1998:76 [ref. 23792], Lazara 2001:204 [ref. 25711], Costa 2002:917 [ref. 26505], Costa in Reis et al. 2003:531 [ref. 27061]). •Valid as Titanolebias prognathus (Amato 1986) -- (Alonso et al. 2023:11 [ref. 40292], Koerber et al. 2023:11 [ref. 40355]). •Valid as Austrolebias prognathus (Amato 1986) -- (Costa 2006:52 [ref. 28708], Costa 2009:188 [ref. 30417], Lanés et al. 2014:17 [ref. 33234], Litz & Koerber 2014:30 [ref. 33622], Bertaco et al. 2016:424 [ref. 34561], Nión et al. 2016:43 [ref. 35565], Loureiro et al. 2018:11 [ref. 36240], Loureiro et al. 2023:170 [ref. 40506]). Current status: Valid as Austrolebias prognathus (Amato 1986). Rivulidae: Cynolebiinae. Distribution: South America: Lagoa Mirim basin and adjacent coastal basins, Laguna dos Patos system (southern Brazil and eastern Uruguay). Habitat: freshwater.