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], Vieira-Guimarães et al. 2024:36 [ref. 41258]). 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.