juanlangi, Austrolebias Costa [W. J. E. M.], Cheffe [M. M.], Salvia [H.] & Litz [T.] in Costa 2006:86, Fig. 34 [Zootaxa No. 1213; ref. 28708] Temporary swamp near banhado do Minuano, road BR-153, Rio Jaguão basin, a tributary of lagoa Mirim, laguna dos Patos System, 31°40'48"S, 54°08'45"W, Jaguarão, Rio Grande do Sul, Brazil. Holotype: UFRJ 6199. Paratypes: Many lots at CIMC, MCP, MUNH [MUNHIN], UFRJ. Plus non-type material. •Valid as Austrolebias juanlangi Costa, Cheffe, Salvia & Litz 2006 -- (Costa 2009:188 [ref. 30417], Litz & Koerber 2014:30 [ref. 33622], Bertaco et al. 2016:424 [ref. 34561], Nión et al. 2016:42 [ref. 35565], Volcan et al. 2017:150 [ref. 35644], Loureiro et al. 2018:11 [ref. 36240], Loureiro et al. 2023:166 [ref. 40506]). •Valid as Matilebias juanlangi (Costa, Cheffe, Salvia & Litz 2006) -- (Alonso et al. 2023:9 [ref. 40292], Koerber et al. 2023:11 [ref. 40355]). Current status: Valid as Matilebias juanlangi (Costa, Cheffe, Salvia & Litz 2006). Rivulidae: Cynolebiinae. Distribution: South America: Lake Mirim basin and upper Negro River basin (Brazil and Uruguay). Habitat: freshwater.