Classification of Frick 1937
†Dicrocerus tehuanus Cope 1877
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†Dicrocerus trilateralis Cope 1877
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†Merycodus grandis Hay 1924
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†Merycodus necatus Leidy 1854
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G. †Merycodus Leidy 1854
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G. †Yumaceras Frick 1937
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†Yumaceras falkenbachi Frick 1937
†Yumaceras figginsi Frick 1937
Fm. Camelidae Gray 1821 [camel]
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Fm. †Protoceratidae Marsh 1891 [protoceratid]
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G. †Protoceras Marsh 1891
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†Protoceras consors Marsh 1897
†Protoceras cristatus Marsh 1894
Invalid names: Calops Marsh 1894 [synonym]
G. †Synthetoceras Stirton 1932
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Subg. †Synthetoceras (Prosynthetoceras) Frick 1937
†Synthetoceras francisi Frick 1937
†Synthetoceras rileyi Frick 1937
†Synthetoceras siouxensis Frick 1937
G. †Hypertragulus Cope 1874
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†Hypertragulus calcaratus Cope 1873
†Hypertragulus dakotensis Frick 1937
†Hypertragulus minor Frick 1937
†Hypertragulus planiceps Sinclair 1905
Invalid names: Allomeryx Sinclair 1905 [synonym]
G. †Hypisodus Cope 1873
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G. †Nanotragulus Lull 1922
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†Nanotragulus albanensis Frick 1937
†Nanotragulus lulli Frick 1937
†Nanotragulus ordinatus Matthew 1907
G. †Leptomeryx Leidy 1853
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†Leptomeryx minimus Frick 1937
†Leptomeryx transmontanus Douglass 1903
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Invalid names: Leptomeryx drummondanus Matthew 1926 [synonym]
Fm. †Gelocidae Schlosser 1886
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G. †Pseudoceras Frick 1937
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†Pseudoceras klausi Frick 1937
†Pseudoceras potteri Frick 1937
†Pseudoceras skinneri Frick 1937
†Pseudoceras wilsoni Frick 1937
Fm. †Dromomerycidae Frick 1937
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G. †Barbouromeryx Frick 1937
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†Barbouromeryx americanus Douglass 1899
†Barbouromeryx madisonius Douglass 1899
†Barbouromeryx milleri Frick 1937
†Barbouromeryx nebrascensis Frick 1937
†Barbouromeryx pawniensis Frick 1937
†Barbouromeryx pseudonebrascensis Frick 1937
†Barbouromeryx submilleri Frick 1937
†Barbouromeryx supernebrascensis Frick 1937
G. †Rakomeryx Frick 1937
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†Rakomeryx gazini Frick 1937
†Rakomeryx jorakianus Frick 1937
†Rakomeryx raki Frick 1937
†Rakomeryx yermonensis Frick 1937
G. †Sinclairomeryx Frick 1937
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†Sinclairomeryx riparius Matthew 1924
†Sinclairomeryx sinclairi Frick 1937
†Sinclairomeryx tedi Frick 1937
G. †Aletomeryx Lull 1920
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†Aletomeryx lugni Frick 1937
†Aletomeryx marshi Lull 1920
†Aletomeryx marslandensis Frick 1937
†Aletomeryx scotti Matthew 1924
G. †Cranioceras Matthew 1918
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†Cranioceras clarendonensis Frick 1937
†Cranioceras dakotensis Frick 1937
†Cranioceras granti Frick 1937
†Cranioceras kinseyi Frick 1937
†Cranioceras mefferdi Frick 1937
†Cranioceras pawniensis Frick 1937
†Cranioceras teres Cope 1874
†Cranioceras texanus Hay 1924
G. †Dromomeryx Douglass 1909
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Subg. †Dromomeryx (Subdromomeryx) Frick 1937
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†Dromomeryx (Subdromomeryx) scotti Frick 1937
†Dromomeryx (Subdromomeryx) wilsoni Frick 1937
†Dromomeryx antilopinus Scott 1893
†Dromomeryx borealis Cope 1877
†Dromomeryx pawniensis Frick 1937
Fm. Moschidae Gray 1821 [musk deer]
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G. †Longirostromeryx Frick 1937
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†Longirostromeryx blicki Frick 1937
†Longirostromeryx clarendonensis Frick 1937
†Longirostromeryx merriami Frick 1937
†Longirostromeryx novomexicanus Frick 1937
†Longirostromeryx serpentis Frick 1937
†Longirostromeryx vigoratus Hay 1924
†Longirostromeryx wellsi Matthew 1904
G. †Parablastomeryx Frick 1937
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†Parablastomeryx advena Matthew 1907
†Parablastomeryx falkenbachi Frick 1937
†Parablastomeryx galushi Frick 1937
†Parablastomeryx gregorii Frick 1937
†Parablastomeryx marsa Frick 1937
†Parablastomeryx olcotti Matthew 1908
†Parablastomeryx primus Matthew 1908
†Parablastomeryx schultzi Frick 1937
†Parablastomeryx scotti Frick 1937
G. †Blastomeryx Cope 1877
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†Blastomeryx francesca Frick 1937
†Blastomeryx francescita Frick 1937
†Blastomeryx mefferdi Frick 1937
G. †Cervalces Scott 1885 [stag moose]
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†Cervalces alaskensis Frick 1937
†Cervalces scotti Lydekker 1898
G. Cervus Linnaeus 1758
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†Cervus aguangae Frick 1937
†Cervus lascrucensis Frick 1937
G. Odocoileus Rafinesque 1832
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†Odocoileus cascensis Frick 1937
†Odocoileus cooki Frick 1937
†Odocoileus dolichopsis Cope 1878
†Odocoileus ensifer Cope 1889
†Odocoileus sheridanus Frick 1937
†Odocoileus whitneyi Allen 1876
Fm. Antilocapridae Gray 1866 [pronghorn]
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G. †Meryceros Frick 1937
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†Meryceros crucensis Frick 1937
†Meryceros hookwayi Furlong 1934
†Meryceros joraki Frick 1937
†Meryceros major Frick 1937
†Meryceros minimus Frick 1937
†Meryceros minor Frick 1937
†Meryceros nenzelensis Frick 1937
G. †Plioceros Frick 1937
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†Plioceros blicki Frick 1937
†Plioceros dehlini Frick 1937
†Plioceros floblairi Frick 1937
G. †Texoceros Frick 1937
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†Texoceros altidens Matthew 1924
†Texoceros edensis Frick 1937
†Texoceros guymonensis Frick 1937
†Texoceros minorei Frick 1937
†Texoceros texanus Hesse 1935
†Texoceros vaughani Frick 1937
Invalid names: Cosorycinae Frick 1937 [empty], Ramocerotinae Frick 1937 [empty]
G. †Stockoceros Skinner 1942
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†Stockoceros conklingi Stock 1930
†Stockoceros onusrosagris Roosevelt and Burden 1934
G. Bison Hamilton-Smith 1827 [bison]
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†Bison alaskensis Rhoads 1897
†Bison arizonica Blake 1898
†Bison crampianus Cope 1894
†Bison crassicornis Richardson 1854
†Bison figginsi Hay and Cook 1928
†Bison francisi Frick 1937
†Bison latifrons Harlan 1825
†Bison occidentalis Lucas 1898
†Bison taylori Hay and Cook 1928
Invalid names: Simobison Hay and Cook 1930 [synonym], Stelabison Figgins 1933 [synonym]
G. †Euceratherium Furlong and Sinclair 1904 [shrub-ox]
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†Euceratherium americanum Gidley 1913
†Euceratherium mayfieldi Troxell 1915
†Euceratherium sinclairi Furlong 1905
Invalid names: Aftonius Hay 1913 [synonym], Preptoceras Furlong 1905 [synonym]
G. Oreamnos Rafinesque 1817 [mountain goat]
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†Oreamnos montanus Ord 1815
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Invalid names: Mazama dorsata Rafinesque 1817 [synonym], Rupicapra americana Blainville 1816 [synonym]
Invalid names: Haplocerus Wagner 1844 [synonym]
G. Ovibos Blainville 1816 [muskox]
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†Ovibos appalachicolus Rhoads 1895
†Ovibos giganteus Frick 1937
Ovibos moschatus Zimmermann 1780 [muskox]
†Ovibos zuniensis Gidley 1906
†Cranioceras unicornis Matthew 1918
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Invalid names: Cervavus sinclairi Matthew 1918 [synonym]
†Leptomeryx evansi Leidy 1853
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Invalid names: Trimerodus cedrensis Cope 1873 [synonym]
G. †Symbos Osgood 1905
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†Symbos cavifrons Leidy 1852
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Invalid names: Symbos convexifrons Barbour 1934 [synonym], Symbos promptus Hay 1920 [synonym]
†Symbos tyrelli Osgood 1905
Subg. †Drepanomeryx (Matthomeryx) Frick 1937
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†Drepanomeryx (Matthomeryx) matthewi Frick 1937
Subg. †Barbouromeryx (Probarbouromeryx) Frick 1937
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†Barbouromeryx (Probarbouromeryx) sweeti Frick 1937
Subg. †Barbouromeryx (Protobarbouromeryx) Frick 1937
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†Barbouromeryx (Protobarbouromeryx) marslandensis Frick 1937
Subg. †Barbouromeryx (Barbouromeryx) Frick 1937
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†Barbouromeryx (Barbouromeryx) trigonocorneus Barbour and Schultz 1934
Subg. †Cranioceras (Procranioceras) Frick 1937
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†Cranioceras (Procranioceras) skinneri Frick 1937