paipayensis, Hemigrammus Pearson [N. E.] in Eigenmann & Myers 1929:533 [Memoirs of the Museum of Comparative Zoology v. 43 (pt 5); ref. 1263] Río Paipay, Río Crisnejas drainage, Amazonas system, Andes of northern Peru. Syntypes: CAS 44467 [ex IU 17643] (now 1). Additional original material: CAS 44468 [ex IU 17643] (now 216), ZMA [ex IU 17643] 114207 (1). Type catalog: Nijssen et al. 1982:19 [ref. 19236]. •Valid as Bryconacidnus paipayensis (Pearson 1929) -- (Ortega & Vari 1986:7 [ref. 9708], Pavanelli in Reis et al. 2003:115 [ref. 27061], Barriga Salazar 2014:106 [ref. 35745], Thomaz et al. 2015:Add. 5 [ref. 33893], Netto-Ferreira 2024:115 [ref. 40817]). Current status: Valid as Bryconacidnus paipayensis (Pearson 1929). Stevardiidae: Diapominae. Distribution: South America: western Amazon basin, Peru and Ecuador. Habitat: freshwater.