Acanthodopsis Hancock & Atthey, 1868 † (verified source for family)
Achaenodon Cope, 1874 † (verified source for family)
Actinolepis Agassiz, 1845 † (verified source for family)
Adaetontherium Lewis, 1934 † accepted as Conohyus Pilgrim, 1926 † (verified source for family)
Adocus Cope, 1868 † (verified source for family)
Aeolopithecus Simons, 1965 † accepted as Propliopithecus Schlosser, 1910 † (verified source for family)
Aethaspis Denison, 1958 † (verified source for family)
Agomphus Cope, 1871 † (verified source for family)
Agriomeryx Marsh, 1894 † accepted as Agriochoerus Leidy, 1850 † (verified source for family)
Aipichthys Bassani, 1882 † (verified source for family)
Akanthosuchus O'Neill, Lucas & Kues in Lucas & Kues, 1981 † (verified source for family)
Aletornis Marsh, 1872 (verified source for family)
Allacodon Marsh, 1889 † accepted as Cimolomys Marsh, 1889 † (verified source for family)
Allocryptaspis Whitley, 1940 † (verified source for family)
Allomeryx Sinclair, 1905 † accepted as Hypertragulus Cope, 1874 † (verified source for family)
Americaspis White & Moy-Thomas, 1941 † (verified source for family)
Ammodon Marsh, 1893 † (verified source for family)
Anarthraspis Bryant, 1934 † (verified source for family)
Anatolostylops Zhai, 1978 † (verified source for family)
Anchippodus Leidy, 1868 † (verified source for family)
Anchippus Leidy, 1868 † accepted as Parahippus Leidy, 1858 † (verified source for family)
Anglaspis Jaekel, 1927 † (verified source for family)
Animasaurus Case & Williston, 1912 † (verified source for family)
Ankarapithecus Ozansoy, 1957 † (verified source for family)
Anodontacanthus Davis, 1881 † (verified source for family)
Antiacodon Marsh, 1872 † (verified source for family)
Apatornis Marsh, 1873 † (verified source for family)
Apsopelix Cope, 1871 † (verified source for family)
Arctaspis Heintz, 1929 † (verified source for family)
Arctolepis Eastman, 1908 † (verified source for family)
Arctoryctes Matthew, 1907 † (verified source for family)
Arctotraversodon Sues, Hopson & Shubin, 1992 † (verified source for family)
Arenahippus Froehlich, 2002 † (verified source for family)
Ariaspis Denison, 1963 † (verified source for family)
Asineops Cope, 1870 † (verified source for family)
Astephus Cope, 1873 † (verified source for family)
Asterosteus Newberry, 1875 † (verified source for family)
Astraspis Walcott, 1892 † (verified source for family)
Aulocetus Van Beneden, 1875 † (verified source for family)
Azibius Sudre, 1975 † (verified source for family)
Azygonyx Gingerich, 1989 † (verified source for family)
Bandringa Zangerl, 1969 † (verified source for family)
Baptanodon Marsh, 1880 † (verified source for family)
Basilemys Hay, 1902 † (verified source for family)
Bathmodon Cope, 1872 † (verified source for family)
Bathrodon Marsh, 1872 † accepted as Microsyops Leidy, 1872 † (verified source for family)
Bathyopsoides Patterson, 1939 † (verified source for family)
Bottosaurus Agassiz, 1849 † (verified source for family)
Bramapithecus Lewis, 1934 (verified source for family)
Bryanictis MacIntyre, 1965 † (verified source for family)
Bugenasaura Galton, 1995 † (verified source for family)
Bunophorus Sinclair, 1914 † (verified source for family)
Calamops Sinclair, 1917 † (verified source for family)
Calops Marsh, 1894 † accepted as Protoceras Marsh, 1891 † (verified source for family)
Camelomeryx Scott, 1898 † (verified source for family)
Canowindra Thomson, 1973 † (verified source for family)
Cardipeltis Branson & Mehl, 1931 † (verified source for family)
Carodnia Simpson, 1935 † (verified source for family)
Cebochoerus Gervais, 1852 † (verified source for family)
Centracodon Marsh, 1872 (verified source for family)
Chamasaurus Williston, 1915 † (verified source for family)
Cheirotheroides Hitchcock, 1858 † accepted as Batrachopus Hitchcock, 1845 † (verified source for family)
Chitonodus St. John & Worthen, 1883 † (verified source for family)
Chrysochampsa Estes, 1988 † (verified source for family)
Chrysotriton Estes, 1981 † (verified source for family)
Cionichthys Schaeffer, 1967 † (verified source for family)
Clinodon Clark in Scott & Jepsen, 1936 † (verified source for family)
Cochliodus Agassiz, 1838 † (verified source for family)
Coelosaurus Leidy, 1865 † (verified source for family)
Colonoceras Marsh, 1873 † (verified source for family)
Colonymys Marsh, 1872 † (verified source for family)
Commentrya Sauvage, 1888 † (verified source for family)
Coniopternium Ameghino, 1895 † (verified source for family)
Cosmoptychius Traquair, 1877 † (verified source for family)
Creosaurus Marsh, 1878 † (verified source for family)
Cretoxyrhina Glikman, 1958 † (verified source for family)
Cryptaspis Bryant, 1934 † accepted as Allocryptaspis Whitley, 1940 † (verified source for family)
Ctalecarodnia Simpson, 1935 † (verified source for family)
Ctenothrissa Woodward, 1899 † (verified source for family)
Cuttysarkus Estes, 1964 † (verified source for family)
Cyclopidius Cope, 1878 † (verified source for family)
Cyrtaspis Bryant, 1932 † (verified source for family)
Dawsonia Fritsch, 1879 † (verified source for family)
Dayohyus Schultz & Falkenbach, 1968 † (verified source for family)
Dendrerpeton Owen, 1853 † (verified source for family)
Dermodactylus Marsh, 1881 † (verified source for family)
Desmatotherium Scott, 1883 † (verified source for family)
Diasparactus Case, 1910 † (verified source for family)
Dibelodon Cope, 1885 † (verified source for family)
Dickosteus Miles & Westoll, 1963 † (verified source for family)
Dicrocynodon Marsh in Osborn, 1888 † (verified source for family)
Dikenaspis Denison, 1963 † (verified source for family)
Dinoceras Marsh, 1872 † (verified source for family)
Diplacodon Marsh, 1875 † (verified source for family)
Diplobunops Peterson, 1919 † (verified source for family)
Diploclonus Marsh, 1890 † accepted as Megacerops Leidy, 1870 † (verified source for family)
Diplocynodon Marsh, 1880 † (verified source for family)
Dipriodon Marsh, 1889 † (verified source for family)
Doliochoerus Roger, 1896 † accepted as Doliochoerus Filhol, 1882 † (verified source for family)
Doliodelphis Wilson, 1935 † (verified source for family)