beckfordi, Nannostomus Günther [A.] 1872:146 [Proceedings of the Zoological Society of London 1872 (pt 1) (art. 5) (for 6 Feb. 1872); ref. 2000] Coast of Demerara, Guyana. Holotype (unique): BMNH 1871.12.28.10. •Valid as Nannostomus beckfordi Günther 1872 -- (Weitzman 1966:12 [ref. 12368], Weitzman & Cobb 1975:14 [ref. 7134], Planquette et al. 1996:174 [ref. 22818], Keith et al. 2000:14 [ref. 24547], Géry & Zarske 2002:36 [ref. 26555], Weitzman & Weitzman in Reis et al. 2003:244 [ref. 27061], Zarske 2009:11 [ref. 30197], Zarske 2011:287 [ref. 31670], Melo et al. 2016:133 [ref. 34701], Guimarães et al. 2020:1 [ref. 37521], Silva et al. 2020:8 [ref. 37809], Koerber et al. 2022:27 [ref. 39235], Taphorn et al. 2022:26 [ref. 41297], Vieira et al. 2023:18 [ref. 40759], Marinho 2024:385 [ref. 40817]). Current status: Valid as Nannostomus beckfordi Günther 1872. Lebiasinidae: Pyrrhulininae. Distribution: South America: rivers of Guiana south to Amazon River basin and Amazon River up to Negro River (Brazil, French Guiana, Guyana and Suriname); coastal watersheds of Maranhão (Brazil); introduced elsewhere in Brazil. Habitat: freshwater.