title: Metynnis
text: # Metynnis
  
  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. They generally reach 8–15 cm (3–6 in) in standard length, although a few species may reach up to 18 cm (7 in). The genus contains many of the species known as silver dollars in the aquarium trade.
  
  ## Species
  
  There are currently 15 recognized species in this genus:
  
  * Metynnis altidorsalis C. G. E. Ahl, 1923
  * Metynnis argenteus C. G. E. Ahl, 1923 (silver dollar)
  * Metynnis cuiaba Pavanelli, Ota & Petry, 2009
  * Metynnis fasciatus C. G. E. Ahl, 1931
  * Metynnis guaporensis C. H. Eigenmann, 1915
  * Metynnis hypsauchen (J. P. Müller & Troschel, 1844) (silver dollar)
  * Metynnis lippincottianus (Cope, 1870) (spotted silver dollar)
  * Metynnis longipinnis Zarske & Géry, 2008 (silver dollar)
  * Metynnis luna Cope, 1878
  * Metynnis maculatus (Kner, 1858) (spotted metynnis)
  * Metynnis melanogrammus Ota, Rapp Py-Daniel & Jégu, 2016
  * Metynnis mola C. H. Eigenmann & C. H. Kennedy, 1903
  * Metynnis orinocensis (Steindachner, 1908)
  * Metynnis otuquensis C. G. E. Ahl, 1923
  * Metynnis polystictus Zarske & Géry, 2008 (silver dollar)
  