Trisha Shetty (Editor)

Otarocyon

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Kingdom
  
Family
  
Phylum
  
Chordata

Order
  
Carnivores

Class
  
Subfamily
  
Rank
  
Genus

Otarocyon httpsuploadwikimediaorgwikipediacommonsthu

Similar
  
Archaeocyon, Cynarctoides, Cormocyon, Osbornodon, Enhydrocyon

Otarocyon ("large eared dog") is an extinct genus of the family Borophaginae ("bone-crushing dog"). It was a terrestrial canine which was small in size endemic to North America during the Orellan and Geringian stages of the Oligocene epoch, about 33.3—20.6 Ma (million years ago).

Contents

Taxonomy

Otarocyon was a small borophagine characterized by a short, broad skull, a specialized middle ear, simple, tall premolar teeth, and molars that are incipiently adapted to a hypocarnivore diet. Despite its Oligocene age, the skull of Otarocyon shows several striking similarities to the living fennec fox (Vulpes zerda), particularly in the structure of its middle ear. The similarities are probably convergent, but they suggest that Otarocyon may have been similar in its appearance and habits.

Morphology

Fossil specimens of two individuals' body mass were examined by Legendre and Roth.

  • Specimen 1: 0.689 kg (1.5 lb)
  • Specimen 2: 0.747 kg (1.6 lb)
  • Species

  • O. macdonaldi from the early Oligocene (2 mya, Orellan stage. Two specimens weighed 0.703 kg (1.5 lb) and 0.761 kg (1.7 lb)).
  • O. cooki from the late Oligocene (6 mya, Arikareean stage. Two specimens weighed 0.558 kg (1.2 lb) and 0.761 kg (1.7 lb)).
  • In addition to its earlier age, O. macdonaldi differs from O. cooki in being smaller and in showing lesser development of the specializations that characterize the genus. O. macdonaldi is also the earliest known member of the subfamily Borophaginae, although the later appearing Archaeocyon was more primitive.

    Sister genera

    Archaeocyon, Oxetocyon and Rhizocyon.

    Fossil distribution

  • Cooper Gulch Locality No .1, Toston Formation, Lewis and Clark County, Montana ~33.9—33.3 Ma.
  • Big Muddy Creek Site, Goshen County, Wyoming ~30.8—20.6 Ma.
  • Godsell Ranch Site (SDSM V-5410), Sharps Formation, Oglala Lakota County, South Dakota ~30.8—26.3 Ma.
  • Sharps Site (SDSM V-5359), Sharps Formation, Shannon County, South Dakota. ~30.8—26.3 Ma.
  • Little Muddy Creek Site, Niobrara County, Wyoming, ~30.8—20.6 Ma.
  • References

    Otarocyon Wikipedia


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