brevioris, Oligosarcus Menezes [N. A.] 1990:10, Fig. 2 [Boletim de Zoologia, Universidad de São Paulo v. II [for 1987]; ref. 20060] Arroio Cachoeirinha, bacia do Rio Pelotas, Munic. Vacaria, Rio Grande do Sul, about 28°40'S, 50°40'W, Brazil. Holotype: MZUSP 37508. Paratypes: MCP 6486 (17), 10968 (5); MZUSP 36489 (19), 36492-93 (4, 2); USNM 278960 (17), 278965 (2). Type catalog: Oyakawa 1996:486 [ref. 23140]. •Valid as Oligosarcus brevioris Menezes 1990 -- (Braga 1994:19 [ref. 27878], Gómez & Chebez 1996:48 [ref. 23791], Miquelarena et al. 2002:76 [ref. 26517], Menezes in Reis et al. 2003:151 [ref. 27061], López et al. 2003:29 [ref. 27366], Menni 2004:74 [ref. 28131], Ribeiro et al. 2007:52 [ref. 29321], Litz & Koerber 2014:15 [ref. 33622], Almirón et al. 2015:589 [ref. 33673], Ribeiro & Menezes 2015:77 [ref. 33768], Mirande & Koerber 2015:25 [ref. 35117], Bertaco et al. 2016:414 [ref. 34561], Wendt et al. 2019:5 [ref. 36952], Menezes & Camelier 2024:243 [ref. 40817] dated 1987). Current status: Valid as Oligosarcus brevioris Menezes 1990. Acestrorhamphidae: Acestrorhamphinae. Distribution: South America: upper Uruguay River basin, Argentina and Brazil. Habitat: freshwater.