obscurus, Tetragonopterus Hensel [R.] 1870:86 [Archiv für Naturgeschichte v. 36 (pt. 1); ref. 18277] Rio Cadea [Cadeia] above large waterfall [Santa Maria do Herval], Rio Grande do Sul, southern Brazil. Syntypes: ZMB 7478 (3). •Treated as a synonym of Astyanax aff. fasciatus (Cuvier 1819) and a synonym of Astyanax aeneus (Hensel 1870) -- (Malabarba 1989:129 [ref. 14217]). •Valid as Astyanax obscurus (Hensel 1870) -- (Buckup in Reis et al. 2003:111 [ref. 27061], de Melo & Buckup 2006:46 [ref. 28622], Abilhoa & Duboc 2007:45 [ref. 29285], Bertaco & Lucena 2010:8 [ref. 30750], Tagliacollo et al. 2011:41 [ref. 31138], Oliveira et al. 2013:292 [ref. 32756], Lucena et al. 2013:231 [ref. 32870], Bertaco et al. 2016:412 [ref. 34561], Oliveira et al. 2017:180 [ref. 35587], da Graça et al. 2017:13 [ref. 35556], Lucena et al. 2017:6 [ref. 35607]). Current status: Valid as Astyanax obscurus (Hensel 1870). Acestrorhamphidae: Acestrorhamphinae. Distribution: Rio Jacuí drainage, Laguna dos Patos drainage, Rio Grande do Sul, Brazil. Habitat: freshwater.