Distribution and morphological diversity of Astyanax rivularis Lütken, 1874 (Teleostei Characiformes) in the upper São Francisco River basin, Brazil Rubens Pasa, Caroliny Helena Moreira Fernandes, Renan Rodrigues Rocha, Karine Frehner Kavalco Astyanax S.F. Baird et Girard, 1854 (Teleostei Characiformes) is one of the most well characterized of the neotropical ichthyofauna and is composed of fish with great […]