amazonum, Petalosoma Regan [C. T.] 1911:659, Fig. (p. 660) [Annals and Magazine of Natural History (Series 8) v. 8 (no. 47); ref. 14807] Amazon River at Obidos, Pará state, Brazil. Syntypes: BMNH 1911.10.28.1-2 (2). The correct spelling of this species is amazonum, a noun that does not decline (see note under Curimatus amazonum). •Synonym of Alfaro cultratus (Regan 1908) -- (Rosen & Bailey 1963:43 [ref. 7067], Lucinda in Reis et al. 2003:555 [ref. 27061], Meyer 2015:13 [ref. 34698], Huber 2019:47 [ref. 36941]). Current status: Synonym of Alfaro cultratus (Regan 1908). Poeciliidae: Poeciliinae. Habitat: freshwater.