abbreviatus, Xiphorhamphus Cope [E. D.] 1878:687 [Proceedings of the American Philosophical Society v. 17 (no. 101); ref. 945] Nauta, Amazon River basin, Peru. Lectotype: ANSP 21532. Paralectotypes: ANSP 21105-07 (3), 21982-83 (1, 1). Type catalog: Böhlke 1984:42 [ref. 13621] as holotype and paratypes. Lectotype established by Fowler 1907:461, Fig. 49 [ref. 1374]. •Valid as Acestrorhynchus abbreviatus (Cope 1878) -- (Menezes 1992:46 [ref. 21389], Menezes in Reis et al. 2003:231 [ref. 27061], Toledo-Piza 2007:754 [ref. 29426], Barriga Salazar 2014:109 [ref. 35745], Sarmiento et al. 2014:183 [ref. 35004], DoNascimiento et al. 2017:45 [ref. 35633], Meza-Vargas et al. 2021:15 [ref. 39298]). Current status: Valid as Acestrorhynchus abbreviatus (Cope 1878). Acestrorhynchidae: Acestrorhynchinae. Distribution: South America: upper Amazon and Madeira River basins (Brazil, Colombia, Bolivia, Ecuador and Peru). Habitat: freshwater.