Mesocyon

Mesocyon Temporal range: Early Oligocene–Early Miocene PreЄ Є O S D C P T J K Pg N
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Skull
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Family:	Canidae
Subfamily:	†Hesperocyoninae
Genus:	†Mesocyon Scott, 1890
Type species
†Temnocyon coryphaeus
Species
†M. brachyops †M. coryphaeus †M. temnodon

Mesocyon is an extinct genus of terrestrial carnivore within the family Canidae, subfamily Hesperocyoninae, which inhabited North America from the Early Oligocene 33.9—20.6 Ma, existing for approximately 18 million years.

Though a carnivore, dentition suggests this animal was a hypercarnivore or mesocarnivore.

Taxonomy

Mesocyon was the most basal member of a clade that also includes the genera Cynodesmus, Sunkahetanka, Philotrox, and Enhydrocyon. Mesocyon was named by Scott (1890). It was synonymized subjectively with Enhydrocyon by Swisher (1982). It was assigned to Canidae by Scott (1890), Carroll (1988) and Stevens (1991).

Morphology

File:Turtle Cove mural - Roger Witter.jpg

Restoration of Mesocyon (right) and other animals from the Turtle Cove Formation

Two specimens were examined by Legendre and Roth with the first specimen's mass being estimated at 7.4 kg (16.3 lbs). The second specimen's mass was estimated at 7.19 kg (15.8 lbs).

Fossil distribution

Fossils were uncovered on two sites in north central Oregon. Also, 10 other sites from southern California Colorado, southern Wyoming, and western Nebraska.