Pirarara Agassiz [L.] in Spix & Agassiz 1829:23, pl. 6 Fem. Silurus hemioliopterus Bloch & Schneider 1801. Type by monotypy. Appeared first as name in synonymy under Phractocephalus (see also legend for Pl. 6); made available by Bleeker 1862:11 [ref. 393] and 1863:100 [ref. 401] back to Agassiz; type perhaps Phractocephalus bicolor Agassiz in Spix & Agassiz, not Silurus hemiolopterus Bloch & Schneider as given by Bleeker. See Kottelat 1988:78, 80 [ref. 13380]. •Synonym of Phractocephalus Agassiz 1829 -- (Kottelat 1989 [ref. 14233], Lundberg & Littmann in Reis et al. 2003:438 [ref. 27061], Ferraris 2007:336 [ref. 29155], Grant 2021:81 [ref. 38702]). Current status: Synonym of Phractocephalus Agassiz 1829. Pimelodidae.