melanostomus, Pomolobus Eigenmann [C. H.] 1907:452, Pl. 23 (fig. 6) [Proceedings of the Washington Academy of Sciences v. 8 (for 1906); ref. 10024] Buenos Aires [Ensenada, Buenos Aires Province], Argentina. Holotype: Princeton Univ. (not located). Paratypes: CAS-SU 36026 (7), CAS [ex IU 11364] (7?, missing) Type catalog: Böhlke 1953:12 [ref. 12291]. As Pomolobus? melanostomus originally. Type locality see Calviño & Waldbillig 2020:1 [ref. 37512]. •Valid as Ramnogaster melanostomus (Eigenmann 1907) -- (Whitehead 1985:124 [ref. 5141], Cione et al. 1998:340 [ref. 23325], Sverlij et al. 1998:10 [ref. 27632], Kullander & Ferraris in Reis et al. 2003:37 [ref. 27061], López et al. 2003:9 [ref. 27366], Casciotta et al. 2003:71 [ref. 28130], Menni 2004:71 [ref. 28131], Mirande & Koerber 2015:9 [ref. 35117], Calviño & Waldbillig 2020:1 [ref. 37512]). •Valid as Ramnogaster melanostoma (Eigenmann 1907) -- (Litz & Koerber 2014:6 [ref. 33622] with question, Nión et al. 2016:26 [ref. 35565], Canales-Aguirre et al. 2021:3 [ref. 38579], Loureiro et al. 2023:28 [ref. 40506]). Current status: Valid as Ramnogaster melanostoma (Eigenmann 1907). Clupeidae. Distribution: South America: lower portions of rivers along margin of La Plata River (Argentina and Uruguay). Habitat: freshwater, brackish.