longirostris, Oligosarcus Menezes [N. A.] & Géry [J.] 1983:576, Fig. 4 [Revue Suisse de Zoologie v. 90 (no. 3); ref. 8307] Rio Iguaçu (Paraná basin) at Porto Lupion, Paraná State, Brazil. Holotype: MZUSP 25841. Paratypes: MHNG 2098.8-9 (2), MZUSP 25842-48 (7), USNM 228080 (2). Type catalog: Vari & Howe 1991:32 [ref. 19022], Oyakawa 1996:486 [ref. 23140]. Not treated in Menezes in Reis et al. 2003:152 [ref. 27061], added in Corrigenda (2005). •Valid as Oligosarcus longirostris Menezes & Géry 1983 -- (Menezes 1987:28 [ref. 20060], Braga 1994:18 [ref. 27878], Gómez & Chebez 1996:47 [ref. 23791], López et al. 2003:29 [ref. 27366], Casciotta et al. 2003:88 [ref. 28130], Menni 2004:74 [ref. 28131], Ribeiro et al. 2007:52 [ref. 29321], Almirón et al. 2015:589 [ref. 33673], Ribeiro & Menezes 2015:77 [ref. 33768], Mirande & Koerber 2015:25 [ref. 35117], Wendt et al. 2019:5 [ref. 36952], Reis et al. 2020:459 [ref. 38364], Menezes & Camelier 2024:244 [ref. 40817]). Current status: Valid as Oligosarcus longirostris Menezes & Géry 1983. Acestrorhamphidae: Acestrorhamphinae. Distribution: South America: Iguaçu River basin (Argentina and Brazil). Habitat: freshwater.