Amyzon

Amyzon is an extinct genus belonging to the sucker family Catostomidae first described in 1872 by E. D. Cope. There are 4 valid species in this genus of freshwater fishes. Amyzon are found in North American fossil sites dated from the Early Eocene in Washington the the Early Oligocene in Nevada.

Species
There are currently four valid species included in Amyzon with up to seven species having been described.
 * Amyzon aggregatum (Wilson, 1977) Early Eocene, Horsefly Beds, Horsefly, B.C.
 * Amyzon brevipinne (Cope, 1894) Early Eocene, Allenby Foramtion, Princeton, B.C.
 * Amyzon commune (Cope, 1874) late Eocene Florissant Formation, Colorado
 * Amyzon mentale (Cope, 1872) Oligocene, Osino Oil Shales, Nevada


 * A. gosiutensis Grande, Eastman, and Cavender, 1982 Eocene Green River Formation, Wyoming, Jr synonym of A. aggregatum
 * A. pandatum Cope, 1874 Eocene Florissant Formation, Jr synonym of A. commune
 * A. fusiforme Cope, 1875 Eocene Florissant Formation, Jr synonym of A. commune