gymnoventris, Cynolebias Amato [L. H.] 1986:2, Pl. 1 (figs. 1-2) [Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo v. 11 (no. 162); ref. 9170] Floodlands of India Muerta Creek, 150 meters from the bridge on route 13, near Velázquez, Rocha, Uruguay. Holotype: MHNM 2460. Paratypes: MHNM 2444 (7), 2461-63 (1, 7, 14), 2472 (2), 2475 (2); MZUSP 36450-51 (1, 1). Type catalog: Loureiro et al. 2016:412 [ref. 35150]. •Valid as Cynolebias gymnoventris Amato 1986 -- (Malabarba 1989:158 [ref. 14217], Costa 1995:68 [ref. 22097], Costa 1999:301 [ref. 24229], Costa 1999:93 [ref. 24131]). •Valid as Austrolebias gymnoventris (Amato 1986) -- (Costa 1998:75 [ref. 23792], Lazara 2001:61 [ref. 25711], Costa & Cheffe 2001:180 [ref. 25851], Costa & Cheffe 2002:86 [ref. 26518], Costa 2002:917 [ref. 26505], Costa in Reis et al. 2003:527 [ref. 27061], Costa 2006:21 [ref. 28708], Costa 2009:188 [ref. 30417], Costa 2011:100 [ref. 31504], Loureiro et al. 2011:341 [ref. 31392], Litz & Koerber 2014:30 [ref. 33622], Bertaco et al. 2016:424 [ref. 34561], Nión et al. 2016:42 [ref. 35565], Loureiro et al. 2018:11 [ref. 36240], Loureiro et al. 2023:169 [ref. 40506]). •Valid as Gymnolebias gymnoventris (Amato 1986) -- (Alonso et al. 2023:10 [ref. 40292], Koerber et al. 2023:10 [ref. 40355]). Current status: Valid as Gymnolebias gymnoventris (Amato 1986). Rivulidae: Cynolebiinae. Distribution: South America: Laguna dos Patos basin (Uruguay). Habitat: freshwater.