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Temporal range: Geringian-Harrisonian
Cormocyon leptodus.JPG
Cormocyon leptodus
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Subfamily: Borophaginae
Tribe: Borophagini
Genus: Cormocyon
(Wang and Tedford, 1992)
  • C. haydeni
  • C. copei
Cormocyon range.png
Range of Cormocyon based on fossil distribution

Cormocyon is an extinct genus of Borophaginae canid carnivoran which inhabited most of North America during the Geringian stage through to the Harrisonian stage of the Oligocene epoch living 30.8—20.6 Mya, existing for about 10.2 million years.[1]

Cormocyon contains two species: Cormocyon copei and Cormocyon haydeni. It was first named by Xiaoming Wang and Richard L. Tedford in 1992, who described it as a primitive borophagini genus after comparing it to Nothocyon geismarianus. The period of extinction overlaps the Late Oligocene and Early Miocene supepochs according to fossil record.


Fossil specimens of two individuals' body mass were examined by Legendre and Roth. The first specimen was estimated to weigh 2.79 kg (6.1 lbs). The second specimen was estimated to weigh 2.82 kg (6.2 lbs).[2]

Sister genera

Desmocyon, Euoplocyon, Metatomarctus, Microtomarctus, Protomarctus, Psalidocyon, and Tephrocyon.


  1. ^ PaleoBiology Database: Cormocyon Taxonomy, Species
  2. ^ S. Legendre and C. Roth. 1988. Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia). Historical Biology
  • The Terrestrial Eocene-Oligocene Transition in North America By Donald R. Prothero and Robert J. Emry ISBN 0-521-43387-8
  • Flynn, J.J., 1998. Early Cenozoic Carnivora ("Miacoidea"). pp. 110–123 in C.M. Janis, K.M. Scott, and L.L. Jacobs (eds.) Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge. ISBN 0-521-35519-2

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