Metynnis is a genus of serrasalmid fish from tropical and subtropical South America. They are herbivorous or omnivorous, and inhabit a wide range of freshwater habitats, ranging from rivers and streams (both fast- and slow-flowing), to floodplains, flooded forests, lakes, pools and reservoirs.[1] They generally reach NaNabbr=onNaNabbr=on in standard length,[1] although a few species may reach up to 18abbr=onNaNabbr=on. The genus contains many of the species known as silver dollars in the aquarium trade.
There are currently 15 recognized species in this genus:
| Metynnis altidorsalis C. G. E. Ahl, 1923 | ||
| Metynnis argenteus (silver dollar)C. G. E. Ahl, 1923 | ||
| Metynnis cuiaba Pavanelli, Ota & Petry, 2009 | ||
| Metynnis fasciatus C. G. E. Ahl, 1931 | ||
| Metynnis guaporensis C. H. Eigenmann, 1915 | ||
| Metynnis hypsauchen (silver dollar)(J. P. Müller & Troschel, 1844) | ||
| Metynnis lippincottianus (spotted silver dollar)(Cope, 1870) | ||
| Metynnis longipinnis (silver dollar)Zarske & Géry, 2008 | ||
| Metynnis luna Cope, 1878 | ||
| Metynnis maculatus (spotted metynnis)(Kner, 1858) | ||
| Metynnis melanogrammus Ota, Rapp Py-Daniel & Jégu, 2016[2] | ||
| Metynnis mola C. H. Eigenmann & C. H. Kennedy, 1903 | ||
| Metynnis orinocensis (Steindachner, 1908) | ||
| Metynnis otuquensis C. G. E. Ahl, 1923 | ||
| Metynnis polystictus (silver dollar)Zarske & Géry, 2008 |