hauxwellianus, Tetragonopterus Cope [E. D.] 1870:560 [Proceedings of the American Philosophical Society v. 11; ref. 914] Pebas, Peru. Syntypes: ANSP 8137 (Böhlke holotype), ANSP 8138-42 (5). Type catalog: Böhlke 1984:48 [ref. 13621] as holotype and paratypes. •Synonym of Ctenobrycon spilurus (Valenciennes 1850) -- (see DoNascimiento et al. 2017:[12] [ref. 35679], Benine 2024:144 [ref. 40817]). •Valid as Ctenobrycon hauxwellianus (Cope 1870) -- (Ortega & Vari 1986:8 [ref. 9708], Benine & Cassati in Reis et al. 2003:126 [ref. 27061], Benine et al. 2010:59 [ref. 31067], Barriga Salazar 2014:107 [ref. 35745], Sarmiento et al. 2014:184 [ref. 35004], Ramos et al. 2014:3 [ref. 35321], Careaga et al. 2020:75 [ref. 37774], Meza-Vargas et al. 2021:18 [ref. 39298], Koerber et al. 2022:37 [ref. 39235]). Current status: Valid as Ctenobrycon hauxwellianus (Cope 1870). Acestrorhamphidae: Acestrorhamphinae. Distribution: South America: Amazon River basin (Brazil, Ecuador, Bolivia and Peru). Habitat: freshwater.