mesembrinus, Diplomystes viedmensis Ringuelet [R. A.] 1982:349, Figured (p. 350) [Limnobios (La Plata) v. 2 (no. 5); ref. 8984] Mouth of Senguer River, 45°60'S, 49°10'W, Province of Chubut, Argentina. Holotype (unique): MLP 8452. Type catalog: Ferraris 2007:166 [ref. 29155], Koerber 2007:2 [ref. 29776] with corrections, Miquelarena & Nadalin 2014:10 [ref. 33466]. •Valid as Olivaichthys mesembrinus (Ringuelet 1982) -- (Ferraris in Reis et al. 2003:256 [ref. 27061], Ferraris 2007:166 [ref. 29155]). •Valid as Diplomystes mesembrinus Ringuelet 1982 -- (Azpelicueta 1994:231 [ref. 22312], Azpelicueta 1994:13 [ref. 22377], Burgess & Finley 1996:163 [ref. 22901], Azpelicueta & Gosztonyi 1998:902 [ref. 25377], López et al. 2002:60 [ref. 26808], López et al. 2003:37 [ref. 27366], Lundberg et al. 2004:72 [ref. 27673], Menni 2004:79 [ref. 28131], Muñoz-Ramírez et al. 2014:146 [ref. 33192], Mirande & Koerber 2015:27 [ref. 35117], Muñoz-Ramírez et al. 2023:8 [ref. 40526]). Current status: Valid as Diplomystes mesembrinus (Ringuelet 1982). Diplomystidae. Distribution: South America: Baker, Chubut and Senguer River basins, Argentina. Habitat: freshwater.