pacu, Salmo Natterer [J.] in Diesing 1841:256 [Annalen des Wiener Museums der Naturgeschichte v. 1 (no. 11); ref. 18472] Not available, no distinguishing characters mentioned. Name spelled paccu on p. 251. •Unavailable name -- (Toledo-Piza et al. 2024:445 [ref. 40817]). Nomen Nudum. Current status: Synonym of Piaractus. Serrasalmidae: Colossomatinae.