nigripinnis, Cynolebias Regan [C. T.] 1912:508 [Annals and Magazine of Natural History (Series 8) v. 10 (no. 59); ref. 3648] Río de la Plata, Argentina. Holotype (unique): BMNH 1909.4.2.29. •Valid as Cynolebias nigripinnis Regan 1912 -- (Costa 1995:67 [ref. 22097], Costa 1999:301 [ref. 24229], Fuller et al. 1999:292 [ref. 25838]). •Valid as Austrolebias nigripinnis (Regan 1912) -- (Costa 1998:75 [ref. 23792], Lazara 2001:62 [ref. 25711], Costa 2002:917 [ref. 26505], López et al. 2003:69 [ref. 27366], Menni 2004:86 [ref. 28131], Calviño 2005:15 [ref. 28325], Calviño 2006:183 [ref. 28679], Costa 2006:67 [ref. 28708], Calviño 2007:22 [ref. 29117], Costa 2009:188 [ref. 30417], Litz & Koerber 2014:30 [ref. 33622], Mirande & Koerber 2015:51 [ref. 35117], Alonso et al. 2016:5 [ref. 34643], Calviño et al. 2016:10 [ref. 34699], Nión et al. 2016:43 [ref. 35565], Volcan et al. 2017:387 [ref. 35260], Koerber et al. 2017:70 [ref. 35267], Volcan et al. 2017:151 [ref. 35644], Loureiro et al. 2018:11 [ref. 36240], Jamandre 2023:166 [ref. 40455], Loureiro et al. 2023:165 [ref. 40506]). •Valid as Argolebias nigripinnis (Regan 1912) -- (Alonso et al. 2023:7 [ref. 40292], Koerber et al. 2023:10 [ref. 40355], Koerber et al. 2023:4 [ref. 40368], Alonso et al. 2024:304 [ref. 40863], Koerber 2024:6 [ref. 41228]). Current status: Valid as Argolebias nigripinnis (Regan 1912). Rivulidae: Cynolebiinae. Distribution: South America: lower Paraná and Uruguay River basins (Argentina, Paraguay, Uruguay and Brazil). Introduced in the Philippines. Habitat: freshwater.