Taxonomic names from J. Alroy 2002
- Adunator, D. Russell 1964 [Macroscelidea]
- Agnotocastor coloradensis, R. Wilson 1949 [Castoridae]
- Agnotocastor galushai, Emry 1972 [Castoridae]
- Agnotocastor readingi, Korth 1988 [Castoridae]
- Agriotherium, Wagner 1837 [Ursidae]
- Aguafriamys, J. Wilson and Runkel 1991 [Eomyidae]
- Aguafriamys raineyi, J. Wilson and Runkel 1991 [Eomyidae]
- Ailurus anglicus, Dawkins 1888 [Ailuridae]
- Alilepus, Dice 1931 [Leporidae]
- Allomys stirtoni, Klingener 1968 [Allomyidae]
- Alopecocyon, Camp and Vanderhoof 1940 [Ailuridae]
- Alopex, Kaup 1829 [Canidae]
- Aluralagus, Downey 1968 [Leporidae]
- Amphechinus, Aymard 1850 [Erinaceidae]
- Amphicynodon, Filhol 1881 [Ursidae]
- Amphicyon, Lartet 1836 [Amphicyonidae]
- Amphicyon reinheimeri, Cook 1926 [Amphicyonidae]
- Amphilemur, F. Heller 1935 [Amphilemuridae]
- Anancus bensonensis, Gidley 1926 [Gomphotheriidae]
- Anchitheriomys, Roger 1885 [Castoridae]
- Anchitherium, von Meyer 1844 [Equidae]
- Ancodon, Pomel 1847 [Anthracotheriidae]
- Anisonchus fortunatus, Simpson 1932 [Periptychidae]
- Anisonyx rufa, Rafinesque 1817 [Aplodontidae]
- Anouroneomys magnus, Hutchison and Bown 1980 [Soricidae]
- Antilocapra, Ord 1818 [Antilocapridae]
- Antilocapra americana (Ord 1815) [Antilocapridae]
- Anzanycteris, J. White 1969 [Vespertilionidae]
- Anzanycteris anzensis, J. White 1969 [Vespertilionidae]
- Apheliscus, Cope 1875 [Apheliscidae]
- Aphelops, Owen 1845 [Rhinocerotidae]
- Aphronorus simpsoni, Gazin 1938 [Pentacodontidae]
- Aplocerus, Hamilton-Smith 1827 [Bovidae]
- Aplodontia alexandrae, Furlong 1910 [Aplodontidae]
- Apternodus baladontus, Asher et al. 2002 [Apternodontidae]
- Apternodus dasophylakas, Asher et al. 2002 [Apternodontidae]
- Apternodus major, Asher et al. 2002 [Apternodontidae]
- Arctisorex, Hutchison and Harington 2002 [Soricidae]
- Arctisorex polaris, Hutchison and Harington 2002 [Soricidae]
- Arctocyon, Blainville 1841 [Arctocyonidae]
- Arctocyonides, Lemoine 1891 [Arctocyonidae]
- Arctotherium, Bravard 1857 [Ursidae]
- Arvicola pauperrima, Cooper 1868 [Cricetidae]
- Barylambda, Patterson 1937 [Barylambdidae]
- Bassariscus, Coues 1887 [Procyonidae]
- Bison, Hamilton-Smith 1827 [Bovidae]
- Bison priscus (Bojanus 1827) [Bovidae]
- Blackia, P. Mein 1970 [Sciuridae]
- Blarina, Gray 1838 [Soricidae]
- Blastocerus extraneus, Simpson 1928 [Cervidae]
- Blastomeryx, Cope 1877 [Moschidae]
- Bootherium, Harlan 1825 [Bovidae]
- Bos grunniens, Linnaeus 1766 [Bovidae]
- Bos scaphoceras [Bovidae]
- Bothriodon, Aymard 1846 [Anthracotheriidae]
- Brachyerix, Matthew 1933 [Erinaceidae]
- Brachyerix incertis (W. D. Matthew 1924) [Erinaceidae]
- Brachyerix macrotis, Matthew 1933 [Erinaceidae]
- Brachypotherium, Roger 1904 [Rhinocerotidae]
- Brachyprotoma, Brown 1908 [Mephitidae]
- Camelops minidokae, Hay 1927 [Camelidae]
- Canis latrans, Say 1823 [Canidae]
- Canis rufus, Audubon and Bachman 1851 [Canidae]
- Capatanka gaulodon [unclassified species]
- Capra tatarica, Linnaeus 1758 [Bovidae]
- Capromeryx, Matthew 1902 [Antilocapridae]
- Capromeryx furcifer, Matthew 1902 [Antilocapridae]
- Carpodaptes rosei () [Carpolestidae]
- Carpodaptes stonleyi, R. C. Fox 2002 [Carpolestidae]
- Castor canadensis, Kuhl 1820 [Castoridae]
- Catopsalis calgariensis, L. Russell 1926 [Taeniolabididae]
- Cedromus, R. Wilson 1949 [Sciuridae]
- Cedromus wardi, R. Wilson 1949 [Sciuridae]
- Cephalogale, Jourdan 1862 [Ursidae]
- Ceratogaulus, Matthew 1902 [Mylagaulidae]
- Ceratogaulus rhinocerus, Matthew 1902 [Mylagaulidae]
- Cerdocyon, Hamilton-Smith 1839 [Canidae]
- Chaetodipus, Merriam 1889 [Heteromyidae]
- Chelonia couperi, Harlan 1842 [Megatheriidae]
- Chiromyoides, Stehlin 1916 [Plesiadapidae]
- Chriacus, Cope 1883 [Arctocyonidae]
- Chriacus orthogonius, L. Russell 1929 [Arctocyonidae]
- Churcheria, Storer 2002 [Ischyromyidae]
- Cimolestes magnus, Clemens and Russell 1965 [Creodonta]
- Cimolodon, O. C. Marsh 1889 [Cimolodontidae]
- Clethrionomys, Tilesius 1850 [Cricetidae]
- Clinopternodus, Clark 1937 [Micropternodontidae]
- Coendou cascoensis, J. A. White 1970 [Erethizontidae]
- Conacodon, Matthew 1897 [Periptychidae]
- Condylura, Illinger 1811 [Talpidae]
- Conepatus, Gray 1837 [Mephitidae]
- Corynorhinus tetralophodon, Handley 1955 [Vespertilionidae]
- Coryphodon lobatus, Cope 1877 [Coryphodontidae]
- Coryphodon oweni, Hebert 1856 [Coryphodontidae]
- Cratogeomys castanops (Baird 1852) [Geomyidae]
- Cricetodipus parvus, Peale 1848 [Heteromyidae]
- Cricetodon, Lartet 1851 [Cricetidae]
- Cricetus talpoides, Richardson 1828 [Geomyidae]
- Cryptopterus, Mein 1970 [Sciuridae]
- Cryptotis, Pomel 1848 [Soricidae]
- Cryptotis kansasensis, Hibbard 1957 [Soricidae]
- Cryptotis meadensis, Hibbard 1953 [Soricidae]
- Cryptotis peregrina, Merriam 1895 [Soricidae]
- Cudahyomys moorei, Hibbard 1944 [Cricetidae]
- Cuon, Hodgson 1838 [Canidae]
- Cuvieronius arellanoi, Ochoterena and Silva 1970 [Gomphotheriidae]
- Cynelos, Jourdan 1862 [Amphicyonidae]
- Cynodictis gracilis, Filhol 1874 [Ursidae]
- Cynomys, Rafinesque 1817 [Sciuridae]
- Cynomys leucurus, C. Merriam 1890 [Sciuridae]
- Cynomys mexicanus, C. Merriam 1892 [Sciuridae]
- Cynomys parvidens, J. Allen 1905 [Sciuridae]
- Cynomys vetus, Hibbbard 1942 [Sciuridae]
- Daphoenus lambei, L. Russell 1934 [Amphicyonidae]
- Dasypterus golliheri, Hibbard 1960 [Vespertilionidae]
- Delphodon praenuntius, L. Russell 1928 [Cimolestidae]
- Desmodus magnus, Gut 1959 [Phyllostomidae]
- Desmodus stocki, J. Jones 1958 [Phyllostomidae]
- Deuterogonodon montanus, Gidley 1935 [Arctocyonidae]
- Dicrostonyx, Gloger 1841 [Cricetidae]
- Didelphis pygmaea (Scott 1894) [Mammalia]
- Didelphis virginiana, Kerr 1792 [Didelphimorphia]
- Didelphodon padanicus, Cope 1892 [Stagodontidae]
- Didelphodus, E.D. Cope 1882 [Leptictidae]
- Didymictis vancleveae, Robinson 1966 [Viverravidae]
- Dinictis felina, Leidy 1854 [Nimravidae]
- Dinofelis, Zdansky 1924 [Felidae]
- Diplolophus, Troxell 1923 [Rodentia]
- Diplolophus insolens, Troxell 1923 [Rodentia]
- Dipodomys, Gray 1841 [Heteromyidae]
- Dipodomys agilis, Gambel 1848 [Heteromyidae]
- Dipodomys deserti, Stephens 1887 [Heteromyidae]
- Dipodomys ingens (Merriam 1904) [Heteromyidae]
- Dipodomys merriami, Mearns 1890 [Heteromyidae]
- Dipodomys ordii, Woodhouse 1853 [Heteromyidae]
- Dipodomys spectabilis, Merriam 1890 [Heteromyidae]
- Dipoides, Jaeger 1835 [Castoridae]
- Dipoides wilsoni, Hibbard 1949 [Castoridae]
- Dipus hudsonius, Zimmermann 1780 [Zapodidae]
- Dissacus, Cope 1881 [Mesonychidae]
- Dolomys minor, Kretzoi 1955 [Cricetidae]
- Domnina thompsoni, Simpson 1941 [Soricidae]
- Domninoides mimicus, R. L. Wilson 1968 [Talpidae]
- Dorcameryx optimae, Reed and Longnecker 1928 [Antilocapridae]
- Drepanodon, Nesti 1826 [Felidae]
- Dysopes glaucinus, Wagner 1843 [Molossidae]
- Ectocion, Cope 1882 [Phenacodontidae]
- Ectoganus, Cope 1874 [Mammalia]
- Ectoganus copei, R. M. Schoch 1981 [Mammalia]
- Ectoganus gliriformis, Cope 1874 [Mammalia]
- Elphidotarsius, Gidley 1923 [Carpolestidae]
- Elphidotarsius florencae, Gidley 1923 [Carpolestidae]
- Elymys, Korth and Emry 1989 [Zapodidae]
- Elymys complexus, Korth and Emry 1989 [Zapodidae]
- Enhydra, Fleming 1822 [Mustelidae]
- Enhydriodon, Falconer 1868 [Mustelidae]
- Entelodon, A. Aymard 1846 [Entelodontidae]
- Entoptychus lambdoideus, Cope 1881 [Entoptychidae]
- Entoptychus minor, Cope 1881 [Entoptychidae]
- Eomellivora, Zdansky 1924 [Mustelidae]
- Eomellivora wimani, Zdansky 1924 [Mustelidae]
- Eomys, Schlosser 1884 [Eomyidae]
- Epoicotherium, Simpson 1927 [Epoicotheriidae]
- Equus jubatus, Hay 1927 [Equidae]
- Equus nearcticus, Blake 1863 [Equidae]
- Equus parastylidens, Mooser 1959 [Equidae]
- Equus pectinatus, Cope 1901 [Equidae]
- Eremotherium, Spillmann 1948 [Megatheriidae]
- Erethizon, Cuvier 1822 [Erethizontidae]
- Esthonyx, E. D. Cope 1874 [Esthonychidae]
- Esthonyx bisulcatus, E. D. Cope 1874 [Esthonychidae]
- Eucastor, Allen 1877 [Castoridae]
- Eucastor phillisi, R. L. Wilson 1968 [Castoridae]
- Euceratherium, Furlong and Sinclair 1904 [Bovidae]
- Euceratherium collinum, E. L. Furlong and W. J. Sinclair 1904 [Bovidae]
- Euhapsis breugerorum, L. Martin 1987 [Castoridae]
- Euhapsis ellicottae, L. Martin 1987 [Castoridae]
- Eusmilus, Gervais 1876 [Nimravidae]
- Fiber oregonus, Hollister 1911 [Cricetidae]
- Florentiamys, A.E. Wood 1936 [Florentiamyidae]
- Florentiamys loomisi, A. Wood 1936 [Florentiamyidae]
- Forstercooperia minuta, Lucas et al. 1981 [Paraceratheriidae]
- Fossorcastor, L. Martin 1987 [Castoridae]
- Fossorcastor greeni, L. Martin 1987 [Castoridae]
- Galera macrodon, Cope 1868 [Mustelidae]
- Geomys, Rafinesque 1817 [Geomyidae]
- Geomys pinetis, Rafinesque 1817 [Geomyidae]
- Glaucomys, Thomas 1908 [Sciuridae]
- Glis canadensis, Erxleben 1777 [Sciuridae]
- Glossotherium, Owen 1840 [Mylodontidae]
- Glossotherium garbanii, Montellano and Carranza-Castaneda 1981 [Mylodontidae]
- Glyptotherium arizonae, Gidley 1926 [Glyptodontidae]
- Gobiconodon, Trofimov 1978 [Gobiconodontidae]
- Gomphotherium, Burmeister 1837 [Gomphotheriidae]
- Goniacodon, Scott 1892 [Triisodontidae]
- Grangeria, Zdansky 1930 [Perissodactyla]
- Gregorymys, A. Wood 1936 [Entoptychidae]
- Gulo, Storr 1780 [Mustelidae]
- Hapalodectes anthracinus, Zhou and Gingerich 1991 [Hapalodectidae]
- Haplomys, Miller and Gidley 1918 [Allomyidae]
- Harrymys canadensis, Korth 1995 [Heteromyidae]
- Heliscomys woodi, McGrew 1941 [Heliscomyidae]
- Hemicyon, Lartet 1851 [Ursidae]
- Herpailurus, Severtzov 1858 [Felidae]
- Hesperosorex, Hibbard 1957 [Soricidae]
- Hesperosorex lovei, Hibbard 1957 [Soricidae]
- Heteromys irroratus, Gray 1868 [Heteromyidae]
- Hippotherium, Kaup 1832 [Equidae]
- Hippotherium dolichops [unclassified species]
- Histiotus stocki (R. A. Stirton 1931) [Vespertilionidae]
- Holmesina floridanus (Robertson 1976) [Pampatheriidae]
- Homotherium, Fabrini 1890 [Felidae]
- Hoplictis, L. Ginsburg 1961 [Mustelidae]
- Hyaenodon, Laizer and Parieu 1838 [Hyaenodontidae]
- Hyaenodon mustelinus, Scott 1894 [Hyaenodontidae]
- Hypolagus furlongi, Gazin 1934 [Leporidae]
- Hypolagus regalis, Hibbard 1939 [Leporidae]
- Hypudaeus leucogaster, Wied-Neuwied 1841 [Cricetidae]
- Hyracodon browni, L. Russell 1934 [Hyracodontidae]
- Hyracotherium, Owen 1841 [Palaeotheriidae]
- Hystricops browni, Shotwell 1963 [Castoridae]
- Indarctos, Pilgrim 1913 [Ursidae]
- Ischnoglossa nivalis, Saussure 1860 [Phyllostomidae]
- Ischyrotomus littoralis, R. Wilson 1949 [Ischyromyidae]
- Jacobsomys, Czaplewski 1987 [Cricetidae]
- Jacobsomys verdensis, Czaplewski 1987 [Cricetidae]
- Jemezius szalayi, Beard 1987 [Omomyidae]
- Kansasimys, A. Wood 1936 [Eomyidae]
- Kansasimys dubius, A. Wood 1936 [Eomyidae]
- Labidolemur major, West 1972 [Apatemyidae]
- Lagomys collaris, Nelson 1893 [Ochotonidae]
- Lagomys palatinus (Cope 1871) [Ochotonidae]
- Lagurus, Gloger 1841 [Cricetidae]
- Lasiopodomys, Lataste 1887 [Cricetidae]
- Lasiurus cinereus (Palisot de Beauvois 1796) [Vespertilionidae]
- Lemmiscus, Thomas 1912 [Cricetidae]
- Lemmus, Link 1795 [Cricetidae]
- Lemmus sibiricus, Ognev 1947 [Cricetidae]
- Leptictis, Leidy 1868 [Leptictidae]
- Leptictis haydeni, Leidy 1868 [Leptictidae]
- Leptomeryx significans (Russell 1954) [Leptomerycidae]
- Lepus alleni, Mearns 1890 [Leporidae]
- Lepus americanus, Erxleben 1777 [Leporidae]
- Lepus arcticus, Ross 1819 [Leporidae]
- Lepus californicus, Gray 1837 [Leporidae]
- Lepus callotis, Wagler 1830 [Leporidae]
- Lepus townsendii, Bachman 1839 [Leporidae]
- Limnonyx, Crusafont Pairo 1950 [Mustelidae]
- Liodontia, Miller and Gidley 1918 [Aplodontidae]
- Lupus gigas, Townsend 1850 [Canidae]
- Macrocranion, Weitzel 1949 [Amphilemuridae]
- Macrognathomys, Hall 1930 [Zapodidae]
- Macrognathomys nanus, Hall 1930 [Zapodidae]
- Mammut, Blumenbach 1799 [Mammutidae]
- Mammuthus, Brookes 1828 [Elephantidae]
- Marmota, Frisch 1775 [Sciuridae]
- Marsholestes, McKenna 1992 [Geolabididae]
- Martes, Frisch 1775 [Mustelidae]
- Martes stirtoni, R. L. Wilson 1968 [Mustelidae]
- Martinogale nambiana, Cope 1874 [Mephitidae]
- Mazama dorsata, Rafinesque 1817 [Bovidae]
- Megalagus, Walker 1931 [Leporidae]
- Megalagus dawsoni, Black 1961 [Leporidae]
- Megalamynodon, H. Wood 1945 [Amynodontidae]
- Megalamynodon regalis, H. Wood 1945 [Amynodontidae]
- Megalesthonyx, Rose 1971 [Esthonychidae]
- Megalesthonyx hopsoni, Rose 1971 [Esthonychidae]
- Megalonyx, Harlan 1825 [Megalonychidae]
- Megalonyx jeffersonii (Desmarest 1822) [Megalonychidae]
- Megalonyx leptostomus, Cope 1893 [Megalonychidae]
- Megalonyx wheatleyi, Cope 1871 [Megalonychidae]
- Megantereon, Croizet and Jobert 1828 [Felidae]
- Meniscotherium, Cope 1874 [Phenacodontidae]
- Meniscotherium chamense, Cope 1874 [Phenacodontidae]
- Mentoclaenodon, Weigelt 1960 [Arctocyonidae]
- Mephitis, Cuvier 1800 [Mephitidae]
- Mephitis macroura, Lichtenstein 1832 [Mephitidae]
- Merychippus shirleyae [unclassified species]
- Mesodma thompsoni, Clemens 1964 [Neoplagiaulacidae]
- Mesogaulus, Riggs 1899 [Mylagaulidae]
- Mesogaulus ballensis, Riggs 1899 [Mylagaulidae]
- Microdipodops, Merriam 1891 [Geomyidae]
- Microeutypomys, Walton 1993 [Eutypomyidae]
- Microeutypomys karenae, Walton 1993 [Eutypomyidae]
- Microparamys sambucus, Korth and Emry 1989 [Ischyromyidae]
- Microsyops, Leidy 1872 [Microsyopidae]
- Microtoscoptes, Schaub 1934 [Cricetidae]
- Microtus, Schrank 1798 [Cricetidae]
- Microtus miurus, Osgood 1901 [Cricetidae]
- Microtus pinetorum (Le Conte 1830) [Cricetidae]
- Mimomys, Forsyth-Major 1902 [Cricetidae]
- Mithrandir, Cifelli 1983 [Periptychidae]
- Monosaulax skinneri, Stout 1999 [Castoridae]
- Montanamus, Ostrander 1983 [Eomyidae]
- Montanamus bjorki, Ostrander 1983 [Eomyidae]
- Mormoops, Leach 1821 [Phyllostomidae]
- Mormoops megaphylla, Peters 1864 [Phyllostomidae]
- Mus humulis, Audubon and Bachman 1841 [Cricetidae]
- Musculus leucopus, Rafinesque 1818 [Cricetidae]
- Mustela eversmanni, Lesson 1827 [Mustelidae]
- Mustela frenata, Lichtenstein 1831 [Mustelidae]
- Mustela nigripes (Audubon and Bachman 1851) [Mustelidae]
- Mustela nivalis, Linnaeus 1766 [Mustelidae]
- Mylohyus, Cope 1869 [Tayassuidae]
- Myotis grisecens, A. Howell 1909 [Vespertilionidae]
- Myotis mangamolaris, Choate and Hall 1967 [Vespertilionidae]
- Myotis rectidens, Choate and Hall 1967 [Vespertilionidae]
- Myotis sodalis, Miller and G. Allen 1928 [Vespertilionidae]
- Myotis thysanodes, Miller 1897 [Vespertilionidae]
- Myrmecoboides, Gidley 1915 [Leptictidae]
- Myrmecoboides montanensis, Gidley 1915 [Leptictidae]
- Mystipterus, Hall 1930 [Talpidae]
- Mystipterus vespertilio, Hall 1930 [Talpidae]
- Napaeozapus, G. Miller 1900 [Zapodidae]
- Nasua, Storr 1780 [Procyonidae]
- Neofiber, F. W. True 1884 [Cricetidae]
- Neofiber alleni, True 1884 [Cricetidae]
- Neofiber leonardi, Hibbard 1943 [Cricetidae]
- Neomeryx finni, Parks 1925 [Antilocapridae]
- Neoplagiaulax, Lemoine 1882 [Neoplagiaulacidae]
- Neotamias, Howell 1929 [Sciuridae]
- Neotoma, Say and Ord 1825 [Cricetidae]
- Neotoma albigula, Hartley 1894 [Cricetidae]
- Neotoma fuscipes, Baird 1858 [Cricetidae]
- Neotoma lepida, Thomas 1893 [Cricetidae]
- Neotoma mexicana, Baird 1855 [Cricetidae]
- Neotoma micropus, Baird 1855 [Cricetidae]
- Neotoma ozarkensis, Brown 1908 [Cricetidae]
- Neotoma stephensi, Goldman 1905 [Cricetidae]
- Neotomodon, Merriam 1898 [Neotomodon]
- Neotomodon alstoni, Merriam 1898 [Neotomodon alstoni]
- Neurotrichus, Günther 1880 [Talpidae]
- Niglarodon, Black 1961 [Aplodontidae]
- Niglarodon koerneri, Black 1961 [Aplodontidae]
- Nimravus, Cope 1879 [Nimravidae]
- Niptomomys favorum, Strait 2001 [Microsyopidae]
- Nothrotheriops, Hoffstetter 1954 [Nothrotheriidae]
- Nothrotheriops texanus (Hay 1916) [Nothrotheriidae]
- Notiosorex, Baird 1877 [Soricidae]
- Nyctinomus brasiliensis, Geoffroy 1824 [Molossidae]
- Ochotona, Link 1795 [Ochotonidae]
- Ochrotomys, Osgood 1909 [Cricetidae]
- Odocoileus, Rafinesque 1832 [Cervidae]
- Odocoileus brachyodontus, Oelrich 1953 [Cervidae]
- Oligobunis, Cope 1881 [Mustelidae]
- Onager, Brisson 1762 [Equidae]
- Ondatra, Link 1795 [Cricetidae]
- Onychomys, Baird 1858 [Cricetidae]
- Oreamnos, Rafinesque 1817 [Bovidae]
- Oreamnos americanus (Blainville 1816) [Bovidae]
- Oregonomys, Martin 1984 [Heteromyidae]
- Oregonomys pebblespringsensis, Martin 1984 [Heteromyidae]
- Oreolagus nebrascensis, McGrew 1941 [Ochotonidae]
- Orthogeomys, C. Merriam 1895 [Geomyidae]
- Oryctomys bottae, Eydoux and Gervais 1836 [Geomyidae]
- Oryctotherium missouriense, Harlan 1841 [Mylodontidae]
- Oryzomys, Baird 1857 [Cricetidae]
- Oryzomys palustris, Harlan 1837 [Cricetidae]
- Osmotherium, Cope 1896 [Mephitidae]
- Osmotherium spelaeum, Cope 1896 [Mephitidae]
- Otognosis longimembris, Coues 1875 [Heteromyidae]
- Ovibos, Blainville 1816 [Bovidae]
- Ovis canadensis, Shaw 1804 [Bovidae]
- Ovis dalli, Nelson 1884 [Bovidae]
- Oxyacodon, Osborn and Earle 1895 [Periptychidae]
- Oxyacodon apiculatus, Osborn and Earle 1895 [Periptychidae]
- Oxyaena, E. D. Cope 1874 [Oxyaenidae]
- Oxyaena forcipata, Cope 1874 [Oxyaenidae]
- Oxyclaenus, Cope 1884 [Arctocyonidae]
- Pachyaena gigantea, Osborn and Wortman 1892 [Mesonychidae]
- Paciculus montanus, Black 1961 [Cricetidae]
- Pagonomus, D. Russell 1964 [Pantolestidae]
- Palaechthon alticuspis, Gidley 1923 [Primates]
- Palaeocastor, Leidy 1869 [Castoridae]
- Palaeoerinaceus, Filhol 1897 [Erinaceidae]
- Palaeogale, von Meyer 1846 [Palaeogalidae]
- Palaeolama, Gervais 1869 [Camelidae]
- Palaeonictis, de Blainville 1842 [Oxyaenidae]
- Palaeonictis occidentalis, Osborn 1892 [Oxyaenidae]
- Palaeoryctes, Matthew 1913 [Palaeoryctidae]
- Palaeoryctes puercensis, Matthew 1913 [Palaeoryctidae]
- Palaeosinopa, Matthew 1901 [Pantolestidae]
- Pampatherium, Ameghino 1875 [Pampatheriidae]
- Panthera, Oken 1816 [Felidae]
- Pantolambda cavirictus, Cope 1883 [Pantolambdidae]
- Pappogeomys, C. Merriam 1895 [Geomyidae]
- Pappogeomys alcorni, R. Russell 1957 [Geomyidae]
- Paradjidaumo, Burke 1934 [Eomyidae]
- Paradjidaumo validus, Korth 1980 [Eomyidae]
- Parailurus, Schlosser 1899 [Ailuridae]
- Paramys, Leidy 1871 [Ischyromyidae]
- Paramys copei, Loomis 1907 [Ischyromyidae]
- Paramys delicatus, Leidy 1871 [Ischyromyidae]
- Paramys excavatus, Loomis 1907 [Ischyromyidae]
- Paranamatomys, Korth 1992 [Eomyidae]
- Parascalops, True 1894 [Talpidae]
- Parataxidea, Zdansky 1924 [Mustelidae]
- Paromomys, Gidley 1923 [Paromomyidae]
- Paromomys alticuspis, Gidley 1923 [Paromomyidae]
- Paromomys depressidens, Gidley 1923 [Paromomyidae]
- Paromomys maturus, Gidley 1923 [Paromomyidae]
- Patriofelis, J. Leidy 1870 [Oxyaenidae]
- Patriofelis ulta, Leidy 1870 [Oxyaenidae]
- Pauromys exallos, Korth and Emry 1989 [Sciuravidae]
- Pauromys simplex, Walton 1993 [Sciuravidae]
- Pauromys texensis, Walton 1993 [Sciuravidae]
- Pecari, Reichenbach 1835 [Tayassuidae]
- Peratherium, Aymard 1850 [Mammalia]
- Perchoerus, J. Leidy 1869 [Tayassuidae]
- Perognathus, Maximillian 1839 [Heteromyidae]
- Perognathus flavescens, Osgood 1900 [Heteromyidae]
- Perognathus flavus, Baird 1855 [Heteromyidae]
- Perognathus inornatus, Merriam 1889 [Heteromyidae]
- Perognathus mclaughlini, Hibbard 1949 [Heteromyidae]
- Perognathus merriami, Allen 1892 [Heteromyidae]
- Perognathus trojectioansrum, Korth 1979 [Heteromyidae]
- Peromyscus, Gloger 1841 [Cricetidae]
- Peromyscus anyapahensis, J. White 1966 [Cricetidae]
- Peromyscus cragini, Hibbard 1944 [Cricetidae]
- Peromyscus cumberlandensis, Guilday and Handley 1967 [Cricetidae]
- Peromyscus difficilis (Allen 1891) [Cricetidae]
- Peromyscus imperfectus, Dice 1925 [Cricetidae]
- Peromyscus pectoralis, Osgood 1904 [Cricetidae]
- Petenyia, Kormos 1934 [Soricidae]
- Phaiomys, Blyth 1863 [Cricetidae]
- Phenacomys, Merriam 1889 [Cricetidae]
- Phenacomys deeringensis (Guthrie and Matthews 1971) [Cricetidae]
- Phenacomys gryci, Repenning 1987 [Cricetidae]
- Phenacomys intermedius, Merriam 1889 [Cricetidae]
- Phlaocyon, Matthew 1899 [Canidae]
- Phlaocyon leucosteus, Matthew 1899 [Canidae]
- Phoberocyon, Ginsburg 1955 [Ursidae]
- Pipistrellus hesperus (H. Allen 1864) [Vespertilionidae]
- Plagioctenodon, Bown 1979 [Nyctitheriidae]
- Plagioctenodon krausae, Bown 1979 [Nyctitheriidae]
- Plagioctenoides, Bown 1979 [Nyctitheriidae]
- Plagioctenoides microlestes, Bown 1979 [Nyctitheriidae]
- Platybelodon, Borissiak 1928 [Gomphotheriidae]
- Plecotus townsendii, Cooper 1837 [Vespertilionidae]
- Plesiadapis, Gervais 1877 [Plesiadapidae]
- Plesictis, Pomel 1846 [Mustelidae]
- Plesiogulo, Zdansky 1934 [Mustelidae]
- Plesiosminthus, Viret 1926 [Zapodidae]
- Plesiosorex, Pomel 1848 [Plesiosoricidae]
- Plesiosorex coloradensis, R. Wilson 1960 [Plesiosoricidae]
- Plesispermophilus, Filhol 1882 [Aplodontidae]
- Pliolemmus, Hibbard 1937 [Cricetidae]
- Plionarctos, Frick 1926 [Ursidae]
- Plionarctos edensis, Frick 1926 [Ursidae]
- Plithocyon, Ginsburg 1955 [Ursidae]
- Potamotelses, Fox 1972 [Mammalia]
- Potamotelses aquilensis, Fox 1972 [Mammalia]
- Praeovibos, Staudinger 1908 [Bovidae]
- Praeovibos priscus, Staudinger 1908 [Bovidae]
- Pratilepus, Hibbard 1939 [Leporidae]
- Pratilepus kansasensis, Hibbard 1939 [Leporidae]
- Presbymys, R. Wilson 1949 [Protoptychidae]
- Presbymys lophatus, R. Wilson 1949 [Protoptychidae]
- Procadurcodon, Gromova 1960 [Amynodontidae]
- Procaprolagus, A. A. Gureev 1960 [Leporidae]
- Procyon, Storr 1780 [Procyonidae]
- Proheteromys sulculus, R. Wilson 1960 [Heteromyidae]
- Promioclaenus, Trouessart 1904 [Hyopsodontidae]
- Promylagaulus, McGrew 1941 [Mylagaulidae]
- Promylagaulus riggsi, McGrew 1941 [Mylagaulidae]
- Pronothodectes, Gidley 1923 [Plesiadapidae]
- Pronothodectes matthewi, Gidley 1923 [Plesiadapidae]
- Proscalops secundus, W. D. Matthew 1909 [Proscalopidae]
- Prosciurus albiclivus, Korth 1994 [Aplodontidae]
- Prosigmodon holocuspis, Czaplewski 1987 [Cricetidae]
- Protapirus, Filhol 1877 [Tapiridae]
- Protemnocyon, Hatcher 1901 [Amphicyonidae]
- Proterix, Matthew 1903 [Erinaceidae]
- Proterix loomisi, Matthew 1903 [Erinaceidae]
- Protoptychus, Scott 1895 [Protoptychidae]
- Protoptychus hatcheri, Scott 1895 [Protoptychidae]
- Protospermophilus, Gazin 1930 [Sciuridae]
- Proviverra, Rütimeyer 1862 [Hyaenodonta]
- Pseudaplodon occidentale, J. R. Macdonald 1956 [Aplodontidae]
- Pseudocylindrodon, Burke 1935 [Cylindrodontidae]
- Pseudocylindrodon medius, Burke 1938 [Cylindrodontidae]
- Pseudocylindrodon neglectus, Burke 1935 [Cylindrodontidae]
- Pseudocyon, Lartet 1851 [Amphicyonidae]
- Pseudopalaeocastor, L. Martin 1987 [Castoridae]
- Pseudotheridomys, Schlosser 1926 [Eomyidae]
- Pseudotheridomys hesperus, R. Wilson 1960 [Eomyidae]
- Pseudotrimylus, Gureev 1971 [Soricidae]
- Psittacotherium, Cope 1882 [Mammalia]
- Psittacotherium multifragum, Cope 1882 [Mammalia]
- Pterodon, Blainville 1839 [Hyaenodonta]
- Puma, Jardine 1834 [Felidae]
- Putorius nigripes, Audubon and Bachman 1851 [Mustelidae]
- Rangifer, Hamilton-Smith 1827 [Cervidae]
- Reithrodontomys, Giglioli 1874 [Cricetidae]
- Reithrodontomys fulvescens, Allen 1894 [Cricetidae]
- Rhynchotherium, Falconer 1868 [Gomphotheriidae]
- Saiga, Gray 1843 [Bovidae]
- Saxonella, D. E. Russell 1964 [Saxonellidae]
- Scalopoides, R.W. Wilson 1960 [Talpidae]
- Scalopoides isodens, R. Wilson 1960 [Talpidae]
- Scalopus, Geoffroy 1803 [Talpidae]
- Scapanus, Pomel 1848 [Talpidae]
- Scapanus orarius, True 1896 [Talpidae]
- Scaphoceros tyrelli, Osgood 1905 [Bovidae]
- Schistodelta sulcatus, Cope 1899 [Cricetidae]
- Schizodontomys, Rensberger 1973 [Heteromyidae]
- Schizodontomys greeni, Rensberger 1973 [Heteromyidae]
- Schizodontomys sulcidens, Rensberger 1973 [Heteromyidae]
- Schizotherium, Gervais 1876 [Chalicotheriidae]
- Sciuravus bridgeri, R. Wilson 1938 [Sciuravidae]
- Sciuravus eucristadens, Burke 1937 [Sciuravidae]
- Sciuropterus, Cuvier 1825 [Sciuridae]
- Sciurus aberti, Woodhouse 1853 [Sciuridae]
- Sciurus alleni, Nelson 1898 [Sciuridae]
- Sciurus arizonensis, Coues 1867 [Sciuridae]
- Sciurus carolinensis, Gmelin 1788 [Sciuridae]
- Sciurus griseus, Ord 1818 [Sciuridae]
- Scottimus ambiguus, Korth 1981 [Cricetidae]
- Scottimus kellamorum, Black 1961 [Cricetidae]
- Scottimus longiquus, Korth 1981 [Cricetidae]
- Scottimus viduus, Korth 1981 [Cricetidae]
- Sigmodon, Say and Ord 1825 [Cricetidae]
- Sigmodon bakeri, R. Martin 1974 [Cricetidae]
- Sigmodon hispidus, Say and Ord 1825 [Cricetidae]
- Sigmodon libitinus, R. Martin 1979 [Cricetidae]
- Sigmodon ochrognathus, Bailey 1902 [Cricetidae]
- Simimys, R. Wilson 1935 [Simimyidae]
- Simocyon, Wagner 1858 [Ailuridae]
- Simocyon primigenius, Wagner 1858 [Ailuridae]
- Sinclairella, Jepsen 1934 [Apatemyidae]
- Sinclairella dakotensis, Jepsen 1934 [Apatemyidae]
- Sinclairia oregoniana, Ameghino 1912 [Megalonychidae]
- Sinopa rapax, Leidy 1871 [Hyaenodontidae]
- Smilodon, Lund 1841 [Felidae]
- Soergelia, Schaub 1951 [Bovidae]
- Sorex arcticus, Kerr 1792 [Soricidae]
- Sorex arizonae, Diersing and Hoffmeister 1977 [Soricidae]
- Sorex cinereus, Kerr 1792 [Soricidae]
- Sorex cudahyensis, Hibbard 1944 [Soricidae]
- Sorex dispar, Batchelder 1896 [Soricidae]
- Sorex fumeus, Miller 1895 [Soricidae]
- Sorex leahyi, Hibbard 1956 [Soricidae]
- Sorex longirostris, Bachman 1837 [Soricidae]
- Sorex merriami, Dobson 1890 [Soricidae]
- Sorex monticolus, Merriam 1890 [Soricidae]
- Sorex ornatus, Merriam 1895 [Soricidae]
- Sorex palustris, Richardson 1828 [Soricidae]
- Sorex rexroadensis, Hibbard 1953 [Soricidae]
- Sorex sandersi, Hibbard 1956 [Soricidae]
- Sorex saussurei, Merriam 1892 [Soricidae]
- Sorex taylori, Hibbard 1937 [Soricidae]
- Sorex trowbridgii, Baird 1858 [Soricidae]
- Sorex vagrans, Baird 1858 [Soricidae]
- Spermophilus, Cuvier 1825 [Sciuridae]
- Spermophilus armatus, Kennicott 1863 [Sciuridae]
- Spermophilus boothi, Hibbard 1972 [Sciuridae]
- Spermophilus johnstoni, Hibbard 1972 [Sciuridae]
- Spermophilus lorisrusselli, Hibbard 1976 [Sciuridae]
- Spermophilus meltoni, Hibbard 1972 [Sciuridae]
- Spermophilus spilosoma, Bennett 1833 [Sciuridae]
- Spermophilus townsendii, Bachman 1839 [Sciuridae]
- Spilogale, Gray 1865 [Mephitidae]
- Stegomastodon, Pohlig 1912 [Gomphotheriidae]
- Steneofiber, Geoffroy 1833 [Castoridae]
- Stylinodon inexplicatus, R. M. Schoch and S. G. Lucas 1981 [Mammalia]
- Sylvilagus, Gray 1867 [Leporidae]
- Sylvilagus leonensis, Cushing 1945 [Leporidae]
- Synaptomys, Baird 1858 [Cricetidae]
- Synaptomys australis, G. G. Simpson 1928 [Cricetidae]
- Synaptomys bunkeri, Hibbard 1939 [Cricetidae]
- Synaptomys cooperi, Baird 1858 [Cricetidae]
- Tadarida constantinei, Lawrence 1960 [Molossidae]
- Taeniolabis, Cope 1882 [Taeniolabididae]
- Tamias, Illinger 1811 [Sciuridae]
- Tamias aristus, C. E. Ray 1965 [Sciuridae]
- Tamiasciurus, Trouessart 1880 [Sciuridae]
- Tapirus veroensis, Sellards 1918 [Tapiridae]
- Tarka, McKenna 1990 [Omomyidae]
- Tarka stylifera, McKenna 1990 [Omomyidae]
- Tarkadectes montanensis, McKenna 1990 [Omomyidae]
- Taxidea, Waterhouse 1839 [Mustelidae]
- Taxymys progressus, R. Wilson 1938 [Sciuravidae]
- Tayassu, Fischer 1814 [Tayassuidae]
- Teleoceras felicis, Freudenberg 1921 [Rhinocerotidae]
- Temnocyon ferox, Eyermann 1896 [Amphicyonidae]
- Tenudomys, Rensberger 1973 [Geomyidae]
- Tenudomys macdonaldi, Rensberger 1973 [Geomyidae]
- Terricola, Fatio 1867 [Cricetidae]
- Tetrapassalus proius, West 1973 [Epoicotheriidae]
- Thinobadistes, Hay 1919 [Mylodontidae]
- Thinobadistes segnis, Hay 1919 [Mylodontidae]
- Thisbemys brevicrista, Ostrander 1986 [Ischyromyidae]
- Thomomys, Wied-Neuwied 1839 [Geomyidae]
- Thomomys orientalis, G. G. Simpson 1928 [Geomyidae]
- Tisisthenes parvus, R. Martin 1973 [Mustelidae]
- Tritemnodon, Matthew 1906 [Hyaenodontidae]
- Trogosus, Leidy 1871 [Esthonychidae]
- Tubulodon, Jepsen 1932 [Epoicotheriidae]
- Tubulodon taylori, Jepsen 1932 [Epoicotheriidae]
- Uintatherium, Leidy 1872 [Uintatheriidae]
- Unuchinia, Simpson 1937 [Apatemyidae]
- Urocyon, Baird 1857 [Canidae]
- Ursavus, Schlosser 1899 [Ursidae]
- Ursavus brevirhinus, Hofmann 1887 [Ursidae]
- Ursavus pawniensis, Frick 1926 [Ursidae]
- Ursavus primaevus, Gaillard 1899 [Ursidae]
- Valenia, de Muizon and Cifelli 2000 [Hyopsodontidae]
- Wilsoneumys, L. Martin 1980 [Cricetidae]
- Yoderimys yarmeri, J. Wilson and Runkel 1991 [Eomyidae]
- Ysengrinia, Ginsburg 1965 [Amphicyonidae]
- Zanycteris, Matthew 1917 [Picrodontidae]
- Zanycteris paleocenus, W. D. Matthew 1917 [Picrodontidae]
- Zapus, Coues 1876 [Zapodidae]
- Zapus princeps, Allen 1893 [Zapodidae]
- Zapus rinkeri, Hibbard 1951 [Zapodidae]
- Zapus sandersi, Hibbard 1956 [Zapodidae]