Antilocapridae is a family of artiodactyls endemic to North America. Their closest extant relatives are the giraffids. Only one species, the pronghorn (Antilocapra americana), is living today; all other members of the family are extinct. The living pronghorn is a small ruminant mammal resembling an antelope. It bears small, forked horns.

In most respects, antilocaprids resemble other ruminants. They have a complex, four-chambered stomach for digesting tough plant matter, cloven hooves, and a similar body shape to antelopes. Their horns resemble those of the bovids, in that they have a true horny sheath, but, uniquely, they are shed outside the breeding season, and subsequently regrown. Their lateral toes are even further diminished than in bovids, with the digits themselves being entirely lost, and only the cannon bones remaining. Antilocaprids have the same dental formula as most other ruminants:

Evolution

The antilocaprids evolved in North America, where they filled a niche similar to that of the bovids that evolved in the Old World. During the Miocene and Pliocene, they were a diverse and successful group, with many different species. Some had horns with bizarre shapes, or had four, or even six, horns. Examples include Osbornoceros, with smooth, slightly curved horns, Paracosoryx, with flattened horns that widened to forked tips, Ramoceros, with fan-shaped horns, and Hayoceros, with four horns.^[1][2]

Species

• Subfamily Antilocaprinae
  • Tribe Antilocaprini
    • Genus Antilocapra
      • Antilocapra americana - Pronghorn
        • Antilocapra americana americana Common Pronghorn
        • Antilocapra americana mexicana - Mexican Pronghorn
        • Antilocapra americana peninsularis - Lower Californian Pronghorn
        • Antilocapra americana sonoriensis - Sonoran Pronghorn
        • Antilocapra americana oregona - Oregon Pronghorn
        • Antilocapra maquinensis^{[citation needed]}
        • Antilocapra pacifica = a large trophy-sized male A. americana^{[citation needed]}
    • Genus †Texoceros
      • Texoceros altidens
      • Texoceros edensis
      • Texoceros guymonensis
      • Texoceros minorei
      • Texoceros texanus
      • Texoceros vaughani
  • Tribe †Ilingoceratini
    • Genus †Ilingoceros
      • Ilingoceros alexandrae
      • Ilingoceros schizoceros
    • Genus †Ottoceros
      • Ottoceros peacevalleyensis
    • Genus †Plioceros
      • Plioceros blicki
      • Plioceros dehlini
      • Plioceros floblairi
    • Genus †Sphenophalos
      • Sphenophalos garciae
      • Sphenophalos middleswarti
      • Sphenophalos nevadanus
  • Tribe †Proantilocaprini
    • Genus †Proantilocapra
      • Proantilocapra platycornea
    • Genus †Osbornoceros
      • Osbornoceros osborni
  • Tribe Stockoceratini
    • Genus †Capromeryx - (Jr synonym Breameryx)
      • Capromeryx arizonensis - (Jr synonyms B. arizonensis)
      • Capromeryx furcifer - (Jr synonyms B. minimus, C. minimus)
      • Capromeryx gidleyi - (Jr synonym B. gidleyi)
      • Capromeryx mexicana - (Jr synonym B. mexicana)
      • Capromeryx minor - (Jr synonym B.minor)
      • Capromeryx tauntonensis
    • Genus †Ceratomeryx
      • Ceratomeryx prenticei
    • Genus †Hayoceros
      • Hayoceros barbouri
      • Hayoceros falkenbachi
    • Genus †Hexameryx
      • Hexameryx simpsoni
    • Genus †Hexobelomeryx
      • Hexobelomeryx fricki
      • Hexobelomeryx simpsoni
    • Genus †Stockoceros
      • Stockoceros conklingi (Jr synonym S. onusrosagris)
        

        

        Stockoceros conklingi skeleton
    • Genus †Tetrameryx
      • Tetrameryx irvingtonensis
      • Tetrameryx knoxensis
      • Tetrameryx mooseri
      • Tetrameryx shuleri
      • Tetrameryx tacubayensis
• Subfamily Merycodontinae
  • Genus †Cosoryx
    • Cosoryx agilis
    • Cosoryx cerroensis
    • Cosoryx furcatus
    • Cosoryx ilfonensis
    • Cosoryx trilateralis
  • Genus †Meryceros
    • Meryceros crucensis
    • Merycerus crucianus
    • Meryceros hookwayi
    • Meryceros joraki
    • Meryceros major
    • Meryceros nenzelensis
    • Meryceros warreni
  • Genus †Merycodus
    • Merycodus furcatus
    • Merycodus grandis
    • Merycodus necatus
    • Merycodus prodromus
    • Merycodus sabulonis
  • Genus †Paracosoryx
    • Paracosoryx alticornis
    • Paracosoryx burgensis
    • Paracosoryx dawesensis
    • Paracosoryx furlongi
    • Paracosoryx loxoceros
    • Paracosoryx nevadensis
    • Paracosoryx wilsoni
  • Genus †Ramoceros
    • Ramoceros brevicornis
    • Ramoceros coronatus
    • Ramoceros marthae
    • Ramoceros merriami
    • Ramoceros osborni
    • Ramoceros palmatus
    • Ramoceros ramosus
  • Genus †Submeryceros
    • Submeryceros crucianus
    • Submeryceros minimus
    • Submeryceros minor

References

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