arachan, Austrolebias Loureiro [M.], Azpelicueta [M. de las M.] & García [G.] 2004:23, Figs. 1-2 [Revue Suisse de Zoologie v. 111 (no. 1); ref. 27658] Pond close to Route 7 and Arroyo Chuy, Laguna Merín basin, Depart. Cerro Largo, Uruguay, about 32°15'S, 54°00'W. Holotype: ZVC-P 4336. Paratypes: MHNG 2641.88 (6); ZVC-P 4314 (3), 4317 (8, 4 c&s), 4329 (4, c&s), 4331 (21, 3 c&s), 4332 (15), 4333 (19, 8 c&s), 4335 (6), 4528 (6, 2 c&s), 4574 (14, 2 c&s). Type catalog: Loureiro et al. 2016:414 [ref. 35150]. Previously known to aquarists as Austrolebias uruguayensis, a nomen nudum. •Valid as Austrolebias arachan Loureiro, Azpelicueta & García 2004 -- (Costa 2006:113 [ref. 28708], Costa 2009:188 [ref. 30417], Loureiro et al. 2011:340 [ref. 31392], Lanés et al. 2014:17 [ref. 33234], Volcan et al. 2014:171 [ref. 33543], Litz & Koerber 2014:30 [ref. 33622], Bertaco et al. 2016:423 [ref. 34561], Nión et al. 2016:42 [ref. 35565], Loureiro et al. 2018:11 [ref. 36240], Lanés et al. 2021:514 [ref. 38189], Volcan et al. 2021:104 [ref. 38292], Loureiro et al. 2023:167 [ref. 40506]). •Valid as Garcialebias arachan (Loureiro, Azpelicueta & García 2004) -- (Alonso et al. 2023:13 [ref. 40292], Koerber et al. 2023:10 [ref. 40355]). Current status: Valid as Garcialebias arachan (Loureiro, Azpelicueta & García 2004). Rivulidae: Cynolebiinae. Distribution: South America: along the border of Uruguay and Rio Grande do Sul (Brazil and Uruguay). Habitat: freshwater.