From Wikipedia, the free encyclopedia
Jump to: navigation, search
Temporal range: 23.03–5.33 Ma
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Superfamily: Chalicotherioidea
Family: Chalicotheriidae
Subfamily: Schizotheriinae
Genus: Tylocephalonyx
Species: Tylocephalonyx skinneri

Tylocephalonyx is an extinct dome-headed chalicothere from the Miocene in North America. It may have used its "dome" in the same way as the pachycephalosaurs. Tylocephalonyx is related to the modern horse, rhino, and tapir.[1]

See also[edit]


  1. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 261. ISBN 1-84028-152-9. 


  • National Geographic Prehistoric Mammals (National Geographic) by Alan Turner
  • After the Dinosaurs: The Age of Mammals (Life of the Past) by Donald R. Prothero
  • Classification of Mammals by Malcolm C. McKenna and Susan K. Bell
  • Late Cretaceous and Cenozoic Mammals of North America: Biostratigraphy and Geochronology by Michael O. Woodburne
  • Colbert's Evolution of the Vertebrates: A History of the Backboned Animals Through Time by Edwin H. Colbert, Michael Morales, and Eli C. Minkoff
  • Coombs, Margery C. (1979). "Tylocephalonyx, a new genus of North American dome-skulled chalicotheres (Mammalia, Perissodactyla)". Bulletin of the AMNH. American Museum of Natural History. 164 (article 1): 1–64. hdl:2246/1041.