luna, Metynnis Cope [E. D.] 1878:692 [Proceedings of the American Philosophical Society v. 17 (no. 101); ref. 945] Amazon River basin, Peru. Holotype (unique): ANSP 21443. Type catalog: Böhlke 1984:50 [ref. 13621]. •Valid as Metynnis luna Cope 1878 -- (Géry 1972:189 [ref. 1594], Ortega & Vari 1986:8 [ref. 9708], Taphorn 1992:260 [ref. 23654], Zarske & Géry 1999:181 [ref. 23984], Jégu in Reis et al. 2003:184 [ref. 27061], Barriga Salazar 2014:108 [ref. 35745], Sarmiento et al. 2014:89, 187 [ref. 35004], Ota et al. 2016:11 [ref. 35002], DoNascimiento et al. 2017:37 [ref. 35633], Careaga et al. 2020:76 [ref. 37774], Meza-Vargas et al. 2021:17 [ref. 39298], Taphorn et al. 2022:28 [ref. 41297], Ota et al. 2024:409 [ref. 40817]). Current status: Valid as Metynnis luna Cope 1878. Serrasalmidae: Serrasalminae. Distribution: South America: Amazon River basin (Bolivia, Brazil, Colombia, Ecuador, Guyana and Peru). Habitat: freshwater.