Classification of Galbreath 1953
†Protohippus labrosus Cope 1874
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Fm. Testudinidae Batsch 1788
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G. Gopherus Rafinesque 1832 [gopher tortoise]
G. Testudo Linnaeus 1758
Fm. Anguidae Gray 1825
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G. †Glyptosaurus Marsh 1871
G. †Peltosaurus Cope 1873
G. †Xestops Cope 1873
Fm. Phalacrocoracidae Reichenbach 1850 [cormorant]
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G. Phalacrocorax Brisson 1760 [cormorant]
G. †Peratherium Aymard 1850
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†Peratherium fugax Cope 1873
†Peratherium huntii Cope 1873
Invalid names: Herpetotherium Cope 1873 [synonym]
G. †Domnina Cope 1873
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†Domnina compressa Galbreath 1953
Invalid names: Miothen Cope 1873 [synonym], Protosorex Scott 1894 [synonym]
G. †Palaeogale von Meyer 1846
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†Palaeogale lagophaga Cope 1873
Invalid names: Bunaelurus Cope 1873 [synonym]
G. †Plionictis Matthew 1924
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†Plionictis ogygia Matthew 1901
†Plionictis parviloba Cope 1873
Fm. †Amphicyonidae Haeckel 1886 [bear-dog]
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Fm. †Allomyidae Marsh 1877
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G. †Pelycomys Galbreath 1953
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†Pelycomys placidus Galbreath 1953
†Pelycomys rugosus Galbreath 1953
Fm. †Entelodontidae Lydekker 1883
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G. †Archaeotherium Leidy 1850
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†Archaeotherium crassum Marsh 1873
†Archaeotherium mortoni Leidy 1850
†Archaeotherium potens Marsh 1893
Invalid names: Pelonax Cope 1873 [synonym]
Fm. †Merycoidodontidae Cook 1912 [oreodont]
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G. †Merycoidodon Leidy 1848
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†Merycoidodon culbertsonii Leidy 1848
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Invalid names: Merycoidodon periculorum Cope 1884 [synonym]
†Merycoidodon gracilis Leidy 1851
G. †Protolabis Cope 1876
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†Protolabis angustidens Cope 1874
†Protolabis fissidens Cope 1876
†Protolabis heterodontus Cope 1874
G. †Merycodus Leidy 1854
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†Merycodus furcatus Leidy 1869
†Merycodus warreni Leidy 1858
Invalid names: Cosoryx Leidy 1869 [synonym]
G. †Merychippus Leidy 1856
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†Merychippus eoplacidus Osborn 1918
†Merychippus paniensis Cope 1874
†Merychippus proplacidus Osborn 1918
†Merychippus sphenodus Cope 1889
G. †Megacerops Leidy 1870
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†Megacerops acer Cope 1873
Invalid names: Megaceratops Cope 1873 [synonym]
G. †Hyracodon Leidy 1856
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†Hyracodon nebraskensis Leidy 1850
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Invalid names: Hyracodon apertus Sinclair 1922 [synonym], Hyracodon arcidens Cope 1873 [synonym], Hyracodon leidyanus Troxell 1921 [synonym], Hyracodon selenidens Troxell 1921 [synonym]
G. †Aphelops Owen 1845
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†Aphelops megalodus Cope 1873
†Aphelops profectus Matthew 1899
†Domnina gradata Cope 1873
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Invalid names: Miothen crassigenis Cope 1873 [synonym], Protosorex crassus Scott 1894 [synonym]
†Ischyromys typus Leidy 1856
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Invalid names: Ischyromys pliacus Troxell 1922 [synonym]
†Merycochoerus proprius Leidy 1858
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Invalid names: Merycochoerus magnus Loomis 1924 [synonym]
G. †Protomeryx Leidy 1856
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G. †Pseudocynodictis Schlosser 1902
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†Pseudocynodictis gregarius Cope 1873
†Pseudocynodictis lippincottianus Cope 1873
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Invalid names: Cynodictis hylactor Hay 1899 [synonym]
†Pseudocynodictis paterculus Matthew 1903
†Pseudocynodictis temnodon Wortman and Matthew 1899
G. †Serridentinus Osborn 1923
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†Serridentinus proavus Cope 1873
†Serridentinus productus Cope 1874
†Subhyracodon occidentalis Leidy 1850
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Invalid names: Hyracodon quadriplicatus Cope 1873 [synonym]
†Trigonias osborni Lucas 1900
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Invalid names: Trigonias cooki Wood 1931 [synonym], Trigonias hypostylus Gregory and Cook 1928 [synonym], Trigonias precopei Gregory and Cook 1928 [synonym], Trigonias preoccidentalis Gregory and Cook 1928 [synonym], Trigonias taylori Gregory and Cook 1928 [synonym]
Fm. Cathartidae Lafresnaye 1839 [New World vulture]
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G. †Palaeogyps Wetmore 1927
G. †Phasmagyps Wetmore 1927