Classification of Kelly and Lander 1988
†Merychyus euryops Cope 1899
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G. †Stylonus Cope 1878
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†Stylonus calamarius Cope 1875
†Stylonus californicus Merriam 1915
†Stylonus carrizoensis Dougherty 1940
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Invalid names: Merychippus tehachapiensis Buwalda and Lewis 1955 [synonym]
†Stylonus missouriensis Douglass 1908
†Stylonus quintus Osborn 1918
†Stylonus sejunctus Cope 1874
†Stylonus seversus Cope 1878
†Stylonus stylodontus Merriam 1919
Fm. †Merycoidodontidae Cook 1912 [oreodont]
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G. †Brachycrus Matthew 1901
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†Brachycrus laticeps Douglass 1900
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Invalid names: Brachycrus vaughani rioosoensis Schultz and Falkenbach 1968 [synonym], Merycochoerus altiramus Douglass 1901 [synonym], Merycochoerus buwaldi Merriam 1919 [synonym], Merycochoerus elrodi Douglass 1901 [synonym], Merycochoerus madisonius Douglass 1901 [synonym], Pronomotherium siouense Sinclair 1915 [synonym]
†Brachycrus rusticus Leidy 1870
G. †Ticholeptus Cope 1878
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†Ticholeptus zygomaticus Cope 1878
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Invalid names: Merycochoerus obliquidens Cope 1886 [synonym], Poatrephes paludicola Douglass 1903 [synonym], Ticholeptus hypsodus Loomis 1924 [synonym], Ticholeptus rileyi Schultz and Falkenbach 1941 [synonym], Ustatochoerus schrammi Schultz and Falkenbach 1941 [synonym]
Invalid names: Poatrephes Douglass 1903 [synonym]
G. †Merychyus Leidy 1858
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†Merychyus crabilli Schultz and Falkenbach 1947
†Merychyus leptoscelos Stevens et al. 1969
†Merychyus major Leidy 1858
†Merychyus medius Leidy 1858
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Invalid names: Merycochoerus coenopus Scott 1890 [synonym], Metoreodon novomexicanus Frick 1929 [synonym]
†Merychyus relictus Matthew and Cook 1909
G. †Dinohippus Quinn 1955
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†Dinohippus albidens Mooser 1968
†Dinohippus coalingensis Merriam 1914
†Dinohippus edensis Frick 1921
†Dinohippus fossulatus Cope 1893
†Dinohippus interpolatus Cope 1893
†Dinohippus leidyanus Osborn 1918
†Dinohippus osborni Frick 1921
†Dinohippus spectans Cope 1880
G. †Pliohippus Marsh 1874
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†Pliohippus lullianus Troxell 1916
†Pliohippus supremus Leidy 1869
G. †Pseudhipparion Ameghino 1904
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†Pseudhipparion gratum Leidy 1869
†Pseudhipparion retrusum Cope 1889
Invalid names: Griphippus Quinn 1955 [synonym]
†Mediochoerus mohavensis Schultz and Falkenbach 1941
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Invalid names: Mediochoerus blicki Schultz and Falkenbach 1941 [synonym]
†Merychippus seversus Cope 1878
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Invalid names: Hippotherium isonesum Cope 1889 [synonym]
†Merychyus elegans Leidy 1858
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†Merychyus elegans smithi Douglass 1903
Invalid names: Merychyus arenarum Cope 1884 [synonym], Merychyus calaminthus Jahns 1940 [synonym], Merychyus calimontanus Dougherty 1940 [synonym], Merychyus delicatus Loomis 1924 [synonym], Merychyus jahnsi Whistler 1967 [synonym], Merychyus minimus Peterson 1907 [synonym], Merychyus paniensis Loomis 1924 [synonym], Merychyus verrucomalus Stevens 1970 [synonym], Ticholeptus tooheyi Schultz and Falkenbach 1941 [synonym]