argenteum, Hydrocyon Valenciennes [A.] 1837:Pl. 9 (fig. 1) [Voyage dans l'Amérique méridionale; ref. 20720] Buenos Aires, Argentina. Holotype (unique): MNHN A-9846. Type catalog: Bertin 1948:23 [ref. 19577]. Name available from plate, description in Valenciennes 1847:9 [ref. 5010] as Hydrocyon argenteus. Pl. 9 was published in 1837. •Valid as Cynopotamus argenteus (Valenciennes 1837) (often seen as 1836) -- (Menezes 1976:23 [ref. 7073], Menezes 1987:6 [ref. 8072], Braga 1994:12 [ref. 27878], Gómez & Chebez 1996:48 [ref. 23791], Sverlij et al. 1998:14 [ref. 27632], Britski et al. 1999:52 [ref. 24147], Lucena & Menezes in Reis et al. 2003:202 [ref. 27061], López et al. 2003:18 [ref. 27366], Menni 2004:74 [ref. 28131], Menezes 2007:60 [ref. 29297], Mirande 2010:496 [ref. 31006], Litz & Koerber 2014:11 [ref. 33622], Sarmiento et al. 2014:184 [ref. 35004], Mirande & Koerber 2015:18 [ref. 35117], Bertaco et al. 2016:413 [ref. 34561], Nión et al. 2016:28 [ref. 35565] dated 1836, Koerber et al. 2017:28 [ref. 35267], Loureiro et al. 2023:56 [ref. 40506]). Current status: Valid as Cynopotamus argenteus (Valenciennes 1837). Characidae: Characinae. Distribution: South America: Paraguay, lower Paraná and Uruguay River basins (Argentina, Brazil, Bolivia, Paraguay and Uruguay). Habitat: freshwater.