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Archaeocyon
''Archaeocyon'' ("beginning dog") is a small extinct genus of the ''Borophaginae'' within the family ''Canidae'' (terrestrial canine) which inhabited most of North America during the Whitneyan stage through Geringian stage of the Oligocene epoch 33.3—26.3 Ma 〔(PaleoBiology Database: ''Archaeocyon'' Taxonomy, Species )〕 ''Archaeocyon'' existed for approximately .
Species of ''Archaeocyon'' are among the earliest known borophagines, although a species of ''Otarocyon'' has a slightly earlier first appearance.
==Taxonomy==
''Archaeocyon'' was a comparatively small and unspecialized dog. Its dentition (teeth) suggests a slightly more hypocarnivorous (omnivorous) diet than the otherwise similar ''Hesperocyon''. The skeleton is also generalized, lacking specializations for running and retaining a plantigrade foot posture.
A few derived features of the dentition support a relationship to Borophaginae and Caninae (the subfamily that includes living canids), rather than to the basal canid subfamily Hesperocyoninae. The temporal position of ''Archaeocyon'' suggests an affinity to borophagines because the first members of Caninae appear substantially earlier.〔Wang, X., R.H. Tedford, and B.E. Taylor. 1999. (Phylogenetic systematics of the Borophaginae (Carnivora, Canidae) ). Bulletin of the American Museum of Natural History, 243:1-391.〕
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