amazonum, Curimatus Humboldt [F. H. A. von] in Humboldt & Valenciennes 1821:165, Pl. 45 (fig. 2) [Voyage de Humboldt et Bonpland v. 2 (Title page 1833); ref. 5612] Rio Marañón, Cachoeira de Rentema, provincia de Saint-Jean de Bracamoros, Peru. No types known. The epithet amazonum [of the amazons, women warriors after which the Amazon River was named] is a noun in the genitive plural and should not be treated as amazonus or amazona. The adjectival form is amazonicus, -a, -um. There is no adjective amazonus, -a, -um. [On advice from Dan H. Nicolson, NMNH, Sept. 2004.] •Valid as Hemiodus amazona (Humboldt 1821) -- (Ortega & Vari 1986:10 [ref. 9708], Nico 2001:140 [ref. 25828]). •Valid as Hemiodus amazonum (Humboldt 1821) -- (Langeani in Reis et al. 2003:97 [ref. 27061], Langeani & Moreira 2013:1267 [ref. 32535], Barriga Salazar 2014:106 [ref. 35745], Sarmiento et al. 2014:186 [ref. 35004], DoNascimiento et al. 2017:38 [ref. 35633], Nogueira et al. 2020:[5] [ref. 38050]). Current status: Valid as Hemiodus amazonum (Humboldt 1821). Hemiodontidae. Distribution: South America: Marañón and Ucayali River basins (Ecuador, Bolivia, Peru and Colombia). Habitat: freshwater.