Species that contain: Brycon and opalinus [ 3 ] records

bahiensis, Brycon Günther [A.] 1864:334 [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Bahia, Brazil. Holotype (unique): BMNH 1862.11.23.26. •Valid as Brycon bahiensis Günther 1864 -- (Howes 1982:10 [ref. 14201]). •Synonym of Brycon opalinus (Cuvier 1819) -- (Lima in Reis et al. 2003:177 [ref. 27061], Lima 2017:67 [ref. 35071]). Current status: Synonym of Brycon opalinus (Cuvier 1819). Bryconidae: Bryconinae. Habitat: freshwater.

nattereri, Brycon Günther [A.] (ex Kner) 1864:334 [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Irisanga, Brazil [= Brazil, São Paulo, Oriçanga (now Estiva Gerbi, 22°16'S, 46°57'W), rio Grande basin on ref. 35071]. Holotype (unique): NMW 16396. Based on Chalceus opalinus of Kner 1860:10 [ref. 7130]. •Valid as Brycon nattereri Günther 1864 -- (Howes 1982:36 [ref. 14201], Géry & Mahnert 1992:814 [ref. 27146], Lima in Reis et al. 2003:177 [ref. 27061], Lima 2004:286 [ref. 27858], Lima 2017:75 [ref. 35071], Koerber et al. 2017:27 [ref. 35267] needs verification for Paraguay, Reis et al. 2020:457 [ref. 38364]). Current status: Valid as Brycon nattereri Günther 1864. Bryconidae: Bryconinae. Distribution: South America: upper Paraná, upper Tocantins and upper São Francisco River basins (Brazil). Habitat: freshwater.

opalinus, Chalceus Cuvier [G.] 1819:351, Pl. 26 (fig. 1) [Mémoires du Muséum National d'Histoire Naturelle, Paris (N. S.) (Série A) Zoologie v. 5; ref. 1017] Rio de Janeiro State, Brazil [probably rio Paraíba do Sul, Andrade Pinto, 22°14'S, 43°25'W]. Holotype (unique): MNHN A-8613 (dry). Type catalog: Bertin 1948:14 [ref. 19577]. •Valid as Brycon opalinus (Cuvier 1819) -- (Howes 1982:38 [ref. 14201], Géry & Mahnert 1992:813 [ref. 27146], Lima in Reis et al. 2003:177 [ref. 27061], Lima 2017:67 [ref. 35071], see DoNascimiento et al. 2017:[13] [ref. 35679], Rodrigues et al. 2021:147 [ref. 38829]). Current status: Valid as Brycon opalinus (Cuvier 1819). Bryconidae: Bryconinae. Distribution: South America: Paraíba do Sul River and Doce River basin (Rio de Janeiro) and Rio Itapemirim (Espírito Santo, eastern Brazil). Habitat: freshwater.