nasutus, Acestrorhynchus Eigenmann [C. H.] 1912:411, Pl. 61 (fig. 4) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Rockstone, Guyana. Holotype (unique): FMNH 53475 [ex CM 1959]. Type catalog: Henn 1928:70 [ref. 12305], Ibarra & Stewart 1987:5 [ref. 12367]. •Valid as Acestrorhynchus nasutus Eigenmann 1912 -- (Menezes & Géry 1983:590 [ref. 8307], Chang & Ortega 1995:2 [ref. 24302], Menezes in Reis et al. 2003:232 [ref. 27061], López-Fernández & Winemiller 2003:204 [ref. 27386], Toledo-Piza 2007:693, 755 [ref. 29426], DoNascimiento et al. 2017:45 [ref. 35633], Meza-Vargas et al. 2021:15 [ref. 39298], Taphorn et al. 2022:10 [ref. 41297]). Current status: Valid as Acestrorhynchus nasutus Eigenmann 1912. Acestrorhynchidae: Acestrorhynchinae. Distribution: South America: Amazon and Orinoco River basins and rivers of Guyana (Brazil, Colombia, Guyana, Peru and Venezuela). Habitat: freshwater.