retropinnis, Yaci de Buen [F.] 1953:52, Figs. 31-33 [Boletim do Instituto Oceanografico, São Paulo v. 4 (no. 1-2); ref. 694] Embalse del Río Negro, Durazno, Uruguay. Holotype: MHNM CI 1809 [ex VT 1048]. Paratypes: (1). Type catalog: Olazarri et al. 1970:7 [ref. 23527], Loureiro et al. 2016:413 [ref. 35150]. •Valid as Odontesthes retropinnis (de Buen 1953) -- (Dyer 1998:535 [ref. 23858], Gállego et al. 1998:105 [ref. 25010], Dyer & Gosztonyi 1999:215 [ref. 24265], Dyer 2000:108 [ref. 26677], Bemvenuti 2002:280 [ref. 26202], Malabarba & Dyer 2002:269 [ref. 26538], Dyer in Reis et al. 2003:522 [ref. 27061], López et al. 2003:68 [ref. 27366], Menezes et al. in Menezes et al. 2003:66 [ref. 27192], Menni 2004:85 [ref. 28131], Dyer 2006:76 [ref. 30646], Litz & Koerber 2014:29 [ref. 33622], Mirande & Koerber 2015:50 [ref. 35117], Bertaco et al. 2016:423 [ref. 34561], Nión et al. 2016:42 [ref. 35565], Wingert et al. 2017:525 [ref. 35244], Carvalho-Filho 2023:95 [ref. 40480], Loureiro et al. 2023:164 [ref. 40506]). Current status: Valid as Odontesthes retropinnis (de Buen 1953). Atherinopsidae: Atherinopsinae. Distribution: South America: La Plata and Uruguay River basins and Lagoa Mirim basin (Argentina, Brazil and Uruguay). Habitat: freshwater.