argenteus, Metynnis Ahl [E.] 1924:24 [Mitteilungen aus dem Zoologischen Museum in Berlin v. 11 (no. 1); ref. 19929] Rio Tapajos, near de Borin, Amazon system, Brazil. Holotype (unique): ZMB 20676. Types mentioned: Paepke 1995:92 [ref. 21847]. •Questionably a synonym of Metynnis altidorsalis Ahl 1924 -- (Géry 1972:192 [ref. 1594]). •Valid as Metynnis argenteus Ahl 1924 -- (Taphorn 1992:254 [ref. 23654], Zarske & Géry 1999:201 [ref. 23984], Jégu in Reis et al. 2003:183 [ref. 27061], Zarske & Géry 2008:175 [ref. 29917], Sarmiento et al. 2014:89, 186 [ref. 35004], Ota et al. 2016:10 [ref. 35002], DoNascimiento et al. 2017:36 [ref. 35633], Urbano-Bonilla et al. 2018:84 [ref. 35773], Meza-Vargas et al. 2021:15 [ref. 39298], Ota et al. 2024:406 [ref. 40817]). Current status: Valid as Metynnis argenteus Ahl 1924. Serrasalmidae: Serrasalminae. Distribution: South Amrica: Amazon and Orinoco river basins (Brazil, Bolivia, Colombia and Peru). Habitat: freshwater.