marginatus, Nannostomus Eigenmann [C. H.] 1909:41 [Annals of the Carnegie Museum v. 6 (no. 1); ref. 1222] Maduni Creek, Guyana. Holotype: FMNH 53550 [ex CM 1171]. Paratypes: (45, CM and IU) BMNH 1911.10.31.167-168 (2), 1912.1.31.5 (1); CAS 62108-14 [ex IU 11696-702] (4, 2, 1, 1, 2, 1, 5); FMNH 7562 (1), 52776-80 (4, 2, 2, 0, 6), 52790 (1), 53551 (1); MCZ 29933 (1), 29937 (1); CAS-SU 21941 (1); USNM 66252 (1), 165450 (1); ZMA 100991 (1). Type catalog: Henn 1928:56 [ref. 12305], Böhlke 1953:25 [ref. 12291], Nijssen et al. 1982:23 [ref. 19236], Ibarra & Stewart 1987:59 [ref. 12367], Vari & Howe 1991:31 [ref. 19022]. •Valid as Nannostomus marginatus Eigenmann 1909 -- (Weitzman 1966:32 [ref. 12368], Weitzman & Cobb 1975:25 [ref. 7134], Paepke & Arendt 2001:147 [ref. 26010], Weitzman & Weitzman in Reis et al. 2003:245 [ref. 27061], Zarske 2009:11 [ref. 30197], Zarske 2011:296 [ref. 31670], Barriga Salazar 2014:110 [ref. 35745], DoNascimiento et al. 2017:45 [ref. 35633], Meza-Vargas et al. 2021:15 [ref. 39298], Marinho 2024:387 [ref. 40817]). Current status: Valid as Nannostomus marginatus Eigenmann 1909. Lebiasinidae: Pyrrhulininae. Distribution: South America: Amazon and Orinoco River basins (Brazil, Ecuador, Colombia, Guyana, Peru, Suriname and Venezuela). Habitat: freshwater.