Amynodontidae ("threatening tooth")[2] is a family of extinct perissodactyls related to true rhinoceroses. They are commonly portrayed as semiaquatic hippo-like rhinos[3][4] but this description only fits members of the Metamynodontini; other groups of amynodonts like the cadurcodontines had more typical ungulate proportions and convergently evolved a tapir-like proboscis. Their fossils have been found in North America, and Eurasia ranging in age from the Middle Eocene to the Early Oligocene, with a single genus (Cadurcotherium) surviving into the Late Oligocene in South Asia (Pakistan).[5] The genus Metamynodon may have survived into the early Miocene.[citation needed]

Temporal range: Late Eocene–Early Miocene
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Superfamily: Rhinocerotoidea
Family: Amynodontidae

See text

Amynodontidae range.png
Range of Amynodontidae based on fossil record
Tooth paratype of Cadurcotherium nouletiMHNT
Zaisanamynodon protheroi




  1. ^ McKenna, M. C; S. K. Bell (1997). Classification of Mammals Above the Species Level. Columbia University Press. ISBN 0-231-11012-X.
  2. ^ American Museum of Natural History, "Perissodactyls Glossary"
  3. ^ Savage, RJG; Long, MR (1986). Mammal Evolution: an illustrated guide. New York: Facts on File. pp. 194. ISBN 0-8160-1194-X.
  4. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 264. ISBN 1-84028-152-9.
  5. ^ Wall, William P. (1989). "The phylogenetic history and adaptive radiation of the Amynodontidae". In Prothero, Donald R; Schoch, Robert M. (eds.). The Evolution of perissodactyls. Oxford University Press. ISBN 9780195060393.