langei, Deuterodon Travassos [H.] 1957:81, Figs. 9-10 [Anais da Academia Brasileira de Ciências v. 29 (no. 1); ref. 12121] Córrego da Divisa, Pôrto de Cima, Paraná, Brazil. Holotype: MNRJ 8534. Paratypes: MNRJ 8532 (1), 8535 (1), 8610 (1, allotype), 8611-14 (4), 8877-79 (3). •Valid as Deuterodon langei Travassos 1957 -- (Lucena & Lucena 1992:134 [ref. 21970], Lucena & Lucena 2002:129 [ref. 26205], Lucena et al. in Reis et al. 2003:127 [ref. 27061], Mirande 2010:502 [ref. 31006], Reis et al. 2020:459 [ref. 38364]). Current status: Valid as Deuterodon langei Travassos 1957. Acestrorhamphidae: Stygichthyinae. Distribution: South America: coastal basins between Cubatão (northern) River, Santa Catarina State and the Njundiaquara River basin in Paraná State (Brazil). Habitat: freshwater.