univentripinnis, Austrolebias Costa [W. J. E. M.] & Cheffe [M. M.] 2005:44, Figs. 1A-B [Zootaxa No. 1052; ref. 28356] Temporary swamp about 200 meters from rio Jaguarão river bank, laguna dos Patos system, Jaguarão, Rio Grande do Sul, Brazil. Holotype: UFRJ 6081. Paratypes: CIMC 8625 (33), 8629 (8), 8631 (12), 8635 (174), 8642 (41); UFRJ 6082 (4), 6083 (6, c&s), 6086 (28). •Valid as Austrolebias univentripinnis Costa & Cheffe 2005 -- (Costa 2006:101 [ref. 28708], Bertaco et al. 2016:424 [ref. 34561], Loureiro et al. 2018:11 [ref. 36240], Serra & Loureiro 2018:554 [ref. 36329], Volcan & Severo-Neto 2019:550 [ref. 36539], Serra et al. 2022:21 [ref. 39131], Alonso et al. 2023:10 [ref. 40292], Koerber et al. 2023:10 [ref. 40355], Loureiro et al. 2023:168 [ref. 40506]). Current status: Valid as Austrolebias univentripinnis Costa & Cheffe 2005. Rivulidae: Cynolebiinae. Distribution: South America: Lake Mirim system (Rio Grande do Sul, Brazil) and northern Uruguay. Habitat: freshwater.