symmetricus, Astyanax Eigenmann [C. H.] 1908:95 [Bulletin of the Museum of Comparative Zoology v. 52 (no. 6); ref. 1221] Rio Solimões at Tabatinga, Amazonas, Brazil. Holotype (unique): MCZ 20768. •Valid as Astyanax symmetricus Eigenmann 1908 -- (Buckup in Reis et al. 2003:112 [ref. 27061], Garutti & Venere 2009:378 [ref. 30493], Barriga Salazar 2014:106 [ref. 35745], Meza-Vargas et al. 2021:17 [ref. 39298]). Current status: Valid as Astyanax symmetricus Eigenmann 1908. Acestrorhamphidae: Acestrorhamphinae. Distribution: South America: upper Amazon River basin (Brazil, Ecuador and Peru). Habitat: freshwater.