robustus, Oligosarcus Menezes [N. A.] 1969:26, 116, Fig. 18 [Arquivos de Zoologia (São Paulo) v. 18 (nos 1-2); ref. 7834] Rio Caí in Montenegro, Rio Grande do Sul, Rio Guaíba basin, Brazil. Holotype: DZSASP 4917. Paratypes: ANSP 21748 (1), 21918 (1); MZUSP [ex DZSASP] 4679-81 (3), 4692-93 (2), 4694 (1), 4696-4700 (5), 4917-20 (4); MCZ 849 (2), 20550 (3). Type catalog: Böhlke 1984:53 [ref. 13621], Oyakawa 1996:489 [ref. 23140]. •Valid as Oligosarcus robustus Menezes 1969 -- (Menezes & Géry 1983:589 [ref. 8307], Menezes 1987:30 [ref. 20060], Malabarba 1989:137 [ref. 14217], Menezes in Reis et al. 2003:152 [ref. 27061], Ribeiro et al. 2007:52 [ref. 29321], Ribeiro & Menezes 2015:78 [ref. 33768], Menezes & Ribeiro 2015:545 [ref. 33973], Bertaco et al. 2016:414 [ref. 34561], Petry et al. 2016:302 [ref. 34966], Wendt et al. 2019:5 [ref. 36952], Koerber et al. 2021:3 [ref. 38894], Giora & Wingert 2023:76 [ref. 41026], Koerber et al. 2023:3 [ref. 40355], Loureiro et al. 2023:70 [ref. 40506], Menezes & Camelier 2024:245 [ref. 40817]). Current status: Valid as Oligosarcus robustus Menezes 1969. Acestrorhamphidae: Acestrorhamphinae. Distribution: South America: coastal drainages of Rio Grande do Sul State (Brazil and Uruguay). Habitat: freshwater.