solitarius, Oligosarcus Menezes [N. A.] 1990:6, Fig. 1 [Boletim de Zoologia, Universidad de São Paulo v. II [for 1987]; ref. 20060] Lagoa Carioca, Vale do Rio Doce, Minas Gerais State, about 20°S, 43°W, Brazil. Holotype: MZUSP 37377. Paratypes: MZUSP 28952 (43), 28973 (38), 28982 (39), 36638 (11), 37401 (7); USNM 289216 (5). Type catalog: Oyakawa 1996:489-490 [ref. 23140]. •Valid as Oligosarcus solitarius Menezes 1990 -- (Menezes in Reis et al. 2003:152 [ref. 27061], Ribeiro et al. 2007:52 [ref. 29321], Ribeiro & Menezes 2015:79 [ref. 33768] dated as 1991, Wendt et al. 2019:5 [ref. 36952], Menezes & Camelier 2024:245 [ref. 40817] dated 1987, Vieira-Guimarães et al. 2024:39 [ref. 41258]). Current status: Valid as Oligosarcus solitarius Menezes 1990. Acestrorhamphidae: Acestrorhamphinae. Distribution: South America: Doce River basin, Minas Gerais (Brazil). Habitat: freshwater.