Opinions from J. Alroy 2002
- 'Adjidaumo belongs to Eomyidae' according to Hay 1899
- 'Adunator belongs to Erinaceomorpha' according to D. Russell 1964
- 'Aenocyon is a subjective synonym of Canis' according to Berta 1988
- 'Agnotocastor coloradensis belongs to Agnotocastor' according to R. Wilson 1949
- 'Agnotocastor galushai belongs to Agnotocastor' according to Emry 1972
- 'Agnotocastor readingi belongs to Agnotocastor' according to Korth 1988
- 'Agriotherium belongs to Ursidae' according to Wagner 1837
- 'Aguafriamys belongs to Eomyidae' according to J. Wilson and Runkel 1991
- 'Aguafriamys raineyi belongs to Aguafriamys' according to J. Wilson and Runkel 1991
- 'Alces belongs to Cervidae' according to Gray 1821
- 'Alilepus belongs to Leporidae' according to Dice 1931
- 'Allacodon belongs to Cimolomyidae' according to Marsh 1889
- 'Allacodon pumilus belongs to Allacodon' according to Marsh 1889
- 'Allomys stirtoni belongs to Allomys' according to Klingener 1968
- 'Alopecocyon belongs to Ursidae' according to Camp and Vanderhoof 1940
- 'Alopex belongs to Canidae' according to Kaup 1829
- 'Aluralagus belongs to Leporidae' according to Downey 1968
- 'Amphechinus belongs to Erinaceidae' according to Aymard 1850
- 'Amphicyon belongs to Amphicyonidae' according to Lartet 1836
- 'Amphicyon reinheimeri belongs to Amphicyon' according to Cook 1926
- 'Amphicyon superbus is recombined as Daphoenodon superbus' according to Olsen 1958
- 'Amphilemur belongs to Amphilemuridae' according to Heller 1935
- 'Anaptomorphus belongs to Omomyidae' according to Cope 1872
- 'Anchitheriomys belongs to Eutypomyidae' according to Roger 1885
- 'Anchitherium belongs to Equidae' according to von Meyer 1844
- 'Anchitherium (Hypohippus) affinis is recombined as Hypohippus affinis' according to Leidy 1858
- 'Ancodon belongs to ' according to Pomel 1847
- 'Anisonchus fortunatus belongs to Anisonchus' according to Simpson 1932
- 'Anouroneomys magnus belongs to Anouroneomys' according to Hutchison and Bown 1980
- 'Anouroneomys minimus belongs to Anouroneomys' according to Hutchison and Bown 1980
- 'Antiacodon belongs to Antiacodontidae' according to Marsh 1872
- 'Antilocapra belongs to Antilocapridae' according to Ord 1818
- 'Anzanycteris belongs to Vespertilionidae' according to J. White 1969
- 'Anzanycteris anzensis belongs to Anzanycteris' according to J. White 1969
- 'Apatemys belongs to Apatemyidae' according to Marsh 1872
- 'Apheliscus belongs to Mioclaenidae' according to Cope 1875
- 'Aphelops belongs to Rhinocerotidae' according to Owen 1845
- 'Aphelops malacorhinus belongs to Aphelops' according to Cope 1881
- 'Aphelops mutilus belongs to Aphelops' according to Matthew 1932
- 'Aphronorus simpsoni belongs to Aphronorus' according to Gazin 1938
- 'Aplocerus is a subjective synonym of Oreamnos' according to Hall and Kelson 1959
- 'Aplocerus is a subjective synonym of Oreamnos' according to Hall and Kellogg 1955
- 'Aplocerus is a subjective synonym of Oreamnos' according to Frick 1927
- 'Aplocerus belongs to ' according to Hamilton-Smith 1827
- 'Apternodus belongs to Apternodontidae' according to Matthew 1903
- 'Apternodus altitalonidus is recombined as Oligoryctes altitalonidus' according to Asher et al. 2002
- 'Apternodus baladontus belongs to Apternodus' according to Asher et al. 2002
- 'Apternodus bicuspis is recombined as Proterix bicuspis' according to Asher et al. 2002
- 'Apternodus dasophylakas belongs to Apternodus' according to Asher et al. 2002
- 'Apternodus major belongs to Apternodus' according to Asher et al. 2002
- 'Archidiskodon sonoriensis is a subjective synonym of Mammuthus imperator' according to Lucas and Gonzalez 1996
- 'Arctisorex belongs to Soricidae' according to Hutchison and Harington 2002
- 'Arctisorex polaris belongs to Arctisorex' according to Hutchison and Harington 2002
- 'Arctocyon belongs to Arctocyonidae' according to Blainville 1841
- 'Arctocyonides belongs to Arctocyonidae' according to Lemoine 1891
- 'Arctotherium is a subjective synonym of Arctodus' according to Kurten 1967
- 'Arctotherium belongs to ' according to Bravard 1857
- 'Arretotherium belongs to Anthracotheriidae' according to Douglass 1901
- 'Asinus is a subjective synonym of Equus' according to Groves and Willoughby 1981
- 'Asinus is a subjective synonym of Equus' according to Azzaroli 1966
- 'Asinus is a subjective synonym of Equus' according to Edinger 1948
- 'Asinus is a subjective synonym of Equus' according to McGrew 1944
- 'Asinus is a subjective synonym of Equus' according to Popov 1939
- 'Bassariscus belongs to Procyonidae' according to Coues 1887
- 'Bassariscus casei belongs to Bassariscus' according to Hibbard 1952
- 'Bathygenys belongs to Merycoidodontidae' according to Douglass 1901
- 'Batodonoides vanhouteni belongs to Batodonoides' according to Bloch et al. 1998
- 'Bison belongs to Bovidae' according to Hamilton-Smith 1827
- 'Blackia belongs to Sciuridae' according to Mein 1970
- 'Blarina belongs to Soricidae' according to Lesson 1842
- 'Blastomeryx belongs to Moschidae' according to Cope 1877
- 'Bootherium belongs to Bovidae' according to Harlan 1825
- 'Bos grunniens belongs to Bos' according to Linnaeus 1766
- 'Bothriodon belongs to Anthracotheriidae' according to Aymard 1846
- 'Brachyerix belongs to Erinaceidae' according to Matthew 1933
- 'Brachyerix macrotis belongs to Brachyerix' according to Matthew 1933
- 'Brachypotherium belongs to Rhinocerotidae' according to Roger 1904
- 'Brachyprotoma belongs to Mustelidae' according to Brown 1908
- 'Brachyrhynchocyon belongs to Amphicyonidae' according to Loomis 1936
- 'Buisnictis burrowsi belongs to Buisnictis' according to Hibbard 1972
- 'Bunomeryx belongs to Artiodactyla' according to Wortman 1898
- 'Bunomeryx montanus belongs to Bunomeryx' according to Wortman 1898
- 'Camelops minidokae belongs to Camelops' according to Hay 1927
- 'Canimartes belongs to Mustelidae' according to Cope 1893
- 'Canis dirus belongs to Canis' according to Berta 1988
- 'Canis latrans belongs to Canis' according to Say 1823
- 'Canis rufus belongs to Canis' according to Audubon and Bachman 1851
- 'Canis texanus is recombined as Cuon texanus' according to Berta 1988
- 'Cantius antediluvius is a subjective synonym of Notharctus venticolus' according to Gunnell 2002
- 'Cantius simonsi belongs to Cantius' according to Gunnell 2002
- 'Capromeryx belongs to Antilocapridae' according to Matthew 1902
- 'Capromeryx furcifer belongs to Capromeryx' according to Matthew 1902
- 'Carpodaptes hobackensis belongs to Carpodaptes' according to Fox 2002
- 'Carpodaptes stonleyi belongs to Carpodaptes' according to Fox 2002
- 'Carpolestes cygneus is recombined as Carpodaptes cygneus' according to Fox 2002
- 'Castor canadensis belongs to Castor' according to Kuhl 1820
- 'Castoroides ohioensis belongs to Castoroides' according to Foster 1838
- 'Catopsalis calgariensis belongs to Catopsalis' according to L. Russell 1926
- 'Cedromus belongs to Sciuridae' according to R. Wilson 1949
- 'Cedromus wardi belongs to Cedromus' according to R. Wilson 1949
- 'Centetodon belongs to Geolabididae' according to Marsh 1872
- 'Cephalogale belongs to Ursidae' according to Jourdan 1862
- 'Ceratogaulus belongs to Mylagaulidae' according to Matthew 1902
- 'Ceratogaulus rhinocerus belongs to Ceratogaulus' according to Matthew 1902
- 'Cerdocyon belongs to Canidae' according to Hamilton-Smith 1839
- 'Cernictis belongs to Mustelidae' according to Hall 1935
- 'Cervus elaphus belongs to Cervus' according to Linnaeus 1758
- 'Cervus hemionus is recombined as Dama hemionus' according to Hall and Kelson 1959
- 'Chaetodipus belongs to Heteromyidae' according to Hafner and Hafner 1983
- 'Chiromyoides belongs to Plesiadapidae' according to Stehlin 1916
- 'Chriacus belongs to Arctocyonidae' according to Cope 1883
- 'Chriacus orthogonius belongs to Chriacus' according to L. Russell 1929
- 'Cimolestes magnus belongs to Cimolestes' according to Clemens and Russell 1965
- 'Cimolodon belongs to Cimolodontidae' according to Marsh 1889
- 'Cimolomys belongs to Cimolomyidae' according to Marsh 1889
- 'Clethrionomys belongs to Cricetidae' according to Tilesius 1850
- 'Clinodon is a subjective synonym of Clinopternodus' according to Asher et al. 2002
- 'Clinodon gracilis is recombined as Clinopternodus gracilis' according to Asher et al. 2002
- 'Clinopternodus belongs to Micropternodontidae' according to Clark 1937
- 'Colodon belongs to Tapiroidea' according to Marsh 1890
- 'Conacodon belongs to Periptychidae' according to Matthew 1897
- 'Condylura belongs to Talpidae' according to Illinger 1811
- 'Conepatus belongs to Mustelidae' according to Gray 1837
- 'Coryphodon lobatus belongs to Coryphodon' according to Cope 1877
- 'Coryphodon oweni belongs to Coryphodon' according to Hebert 1856
- 'Cricetodon belongs to Cricetidae' according to Lartet 1851
- 'Cryptopterus belongs to Sciuridae' according to Mein 1970
- 'Cryptotis belongs to Soricidae' according to Pomel 1848
- 'Cryptotis kansasensis belongs to Cryptotis' according to Hibbard 1957
- 'Cryptotis meadensis belongs to Cryptotis' according to Hibbard 1953
- 'Cryptotis peregrina belongs to Cryptotis' according to Woodman and Timm 1999
- 'Cuon belongs to Canidae' according to Hodgson 1838
- 'Cuvieronius arellanoi is a nomen dubium' according to Montellano 2002
- 'Cuvieronius arellanoi belongs to Cuvieronius' according to Ochoterena and Silva 1970
- 'Cylindrodon belongs to Cylindrodontidae' according to Douglass 1901
- 'Cynelos belongs to Amphicyonidae' according to Jourdan 1862
- 'Cynodesmus belongs to Canidae' according to Scott 1893
- 'Cynomys belongs to Sciuridae' according to Rafinesque 1817
- 'Cynomys leucurus belongs to Cynomys' according to C. Merriam 1890
- 'Cynomys mexicanus belongs to Cynomys' according to C. Merriam 1892
- 'Cynomys parvidens belongs to Cynomys' according to J. Allen 1905
- 'Cynomys vetus belongs to Cynomys' according to Hibbbard 1942
- 'Daphoenus belongs to Amphicyonidae' according to Leidy 1853
- 'Daphoenus lambei belongs to Daphoenus' according to L. Russell 1934
- 'Deinictis is corrected as Dinictis and belongs to Nimravidae' according to Leidy 1854
- 'Delphodon praenuntius belongs to Delphodon' according to L. Russell 1928
- 'Desmodus stocki belongs to Desmodus' according to J. Jones 1958
- 'Deuterogonodon montanus belongs to Deuterogonodon' according to Gidley 1935
- 'Dibelodon tropicus is recombined as Cuvieronius tropicus' according to Montellano 2002
- 'Diceratherium belongs to Rhinocerotidae' according to Marsh 1875
- 'Dicrostonyx belongs to Cricetidae' according to Gloger 1841
- 'Dicrostonyx groenlandicus belongs to Dicrostonyx' according to Fedorov and Goropashnaya 1999
- 'Dicrostonyx groenlandicus belongs to Dicrostonyx' according to Ehrich et al. 2000
- 'Didelphis virginiana belongs to Didelphis' according to Kerr 1792
- 'Didelphodon belongs to Stagodontidae' according to Marsh 1889
- 'Didelphodon padanicus belongs to Didelphodon' according to Cope 1892
- 'Didelphodus belongs to Cimolestidae' according to Cope 1882
- 'Didymictis primus is a subjective synonym of Protictis haydenianus' according to Meehan and Wilson 2002
- 'Didymictis tenuis is recombined as Simpsonictis tenuis' according to Meehan and Wilson 2002
- 'Didymictis vancleveae belongs to Didymictis' according to Robinson 1966
- 'Dinictis felina belongs to Dinictis' according to Leidy 1854
- 'Dinofelis belongs to Felidae' according to Zdansky 1924
- 'Diplolophus belongs to Protrogomorpha' according to Troxell 1923
- 'Diplolophus insolens belongs to Diplolophus' according to Troxell 1923
- 'Dipodomys belongs to Heteromyidae' according to Gray 1841
- 'Dipodomys agilis belongs to Dipodomys' according to Gambel 1848
- 'Dipodomys deserti belongs to Dipodomys' according to Stephens 1887
- 'Dipodomys merriami belongs to Dipodomys' according to Mearns 1890
- 'Dipodomys ordii belongs to Dipodomys' according to Woodhouse 1853
- 'Dipodomys spectabilis belongs to Dipodomys' according to Merriam 1890
- 'Dipoides belongs to Castoridae' according to Jaeger 1835
- 'Dipoides wilsoni belongs to Dipoides' according to Hibbard 1949
- 'Diprionomys belongs to Heteromyidae' according to Kellogg 1910
- 'Diprionomys parvus belongs to Diprionomys' according to Kellogg 1910
- 'Dissacus belongs to Mesonychidae' according to Cope 1881
- 'Dolichohippus is a subjective synonym of Equus' according to Groves and Willoughby 1981
- 'Domnina belongs to Soricidae' according to Cope 1873
- 'Domnina thompsoni belongs to Domnina' according to Simpson 1941
- 'Drepanodon belongs to ' according to Nesti 1826
- 'Drepanomeryx belongs to Dromomerycidae' according to Sinclair 1915
- 'Ectocion belongs to Meniscotheriidae' according to Cope 1882
- 'Ectoganus belongs to Stylinodontidae' according to Cope 1874
- 'Ectoganus copei belongs to Ectoganus' according to Schoch 1981
- 'Ectoganus gliriformis belongs to Ectoganus' according to Cope 1874
- 'Elomeryx belongs to Anthracotheriidae' according to Marsh 1894
- 'Entelodon calkinsi is a nomen dubium' according to Carroll 1988
- 'Elphidotarsius belongs to Carpolestidae' according to Gidley 1923
- 'Elphidotarsius florencae belongs to Elphidotarsius' according to Gidley 1923
- 'Elymys belongs to Zapodidae' according to Korth and Emry 1989
- 'Elymys complexus belongs to Elymys' according to Korth and Emry 1989
- 'Enhydra belongs to Mustelidae' according to Fleming 1822
- 'Enhydra macrodonta belongs to Enhydra' according to Kilmer 1972
- 'Enhydriodon belongs to Mustelidae' according to Falconer 1868
- 'Entelodon belongs to Entelodontidae' according to Aymard 1848
- 'Entoptychus lambdoideus belongs to Entoptychus' according to Cope 1881
- 'Entoptychus minor belongs to Entoptychus' according to Cope 1881
- 'Eobasileus belongs to Uintatheriidae' according to Cope 1872
- 'Eohippus validus is a subjective synonym of Hyracotherium angustidens' according to Kitts 1956
- 'Eomellivora belongs to Mustelidae' according to Zdansky 1924
- 'Eomellivora wimani belongs to Eomellivora' according to Zdansky 1924
- 'Eomoropus belongs to Chalicotherioidea' according to Osborn 1913
- 'Eomys belongs to Eomyidae' according to Schlosser 1884
- 'Epoicotherium belongs to Epoicotheriidae' according to Simpson 1927
- 'Equus jubatus belongs to Equus' according to Hay 1927
- 'Equus nearcticus belongs to Equus' according to Blake 1863
- 'Equus parastylidens belongs to Equus' according to Mooser 1959
- 'Equus pectinatus belongs to Equus' according to Cope 1901
- 'Eremotherium belongs to Megatheriidae' according to Spillmann 1948
- 'Erethizon belongs to Erethizontidae' according to Cuvier 1822
- 'Esthonyx belongs to Esthonychidae' according to Cope 1874
- 'Esthonyx bisulcatus belongs to Esthonyx' according to Cope 1874
- 'Eucastor belongs to Castoridae' according to Allen 1877
- 'Euceratherium belongs to Bovidae' according to Furlong and Sinclair 1904
- 'Euceratherium collinum belongs to Euceratherium' according to Furlong and Sinclair 1904
- 'Euhapsis belongs to Castoridae' according to Peterson 1905
- 'Eumys belongs to Cricetidae' according to Leidy 1856
- 'Eumys lockingtonianus is recombined as Leidymys lockingtonianus' according to Korth 1992
- 'Eumys woodi is recombined as Paciculus woodi' according to Korth 1992
- 'Eumysops simplex is recombined as Simimys simplex' according to Kelly 1992
- 'Eusmilus belongs to Nimravidae' according to Gervais 1876
- 'Felis (Lynx) canadensis belongs to Felis (Lynx)' according to Kerr 1792
- 'Felis pardalis is recombined as Leopardus pardalis' according to Ewer 1973
- 'Felis studeri is recombined as Miracinonyx studeri'
- 'Florentiamys belongs to Florentiamyidae' according to A. Wood 1936
- 'Florentiamys loomisi belongs to Florentiamys' according to A. Wood 1936
- 'Floridatragulus belongs to Camelidae' according to T. White 1940
- 'Forstercooperia belongs to Hyracodontidae' according to H. Wood 1939
- 'Forstercooperia minuta belongs to Forstercooperia' according to Lucas et al. 1981
- 'Gaillardia belongs to Talpidae' according to Matthew 1932
- 'Gaillardia thomsoni belongs to Gaillardia' according to Matthew 1932
- 'Geomys belongs to Geomyidae' according to Rafinesque 1817
- 'Geomys pinetis belongs to Geomys' according to Rafinesque 1817
- 'Glaucomys belongs to Sciuridae' according to Thomas 1908
- 'Glossotherium belongs to Mylodontidae' according to Owen 1840
- 'Glossotherium garbanii is recombined as Paramylodon garbanii' according to W. Miller and Carranza-Castaneda 1998
- 'Glossotherium garbanii belongs to Glossotherium' according to Montellano and Carranza-Castaneda 1981
- 'Glyptotherium arizonae belongs to Glyptotherium' according to Gidley 1926
- 'Gobiconodon belongs to Amphilestinae' according to Trofimov 1978
- 'Gomphotherium belongs to Gomphotheriidae' according to Burmeister 1837
- 'Gomphotherium elegans is a nomen dubium' according to Hibbard 1952
- 'Grangeria belongs to Schizotheriinae' according to Zdansky 1930
- 'Gregorymys belongs to Geomyidae' according to A. Wood 1936
- 'Gulo belongs to Mustelidae' according to Storr 1780
- 'Hapalodectes anthracinus belongs to Hapalodectes' according to Zhou and Gingerich 1991
- 'Haplaletes serior belongs to Haplaletes' according to Gazin 1956
- 'Haplocerus is a subjective synonym of Oreamnos' according to Hall and Kelson 1959
- 'Haplocerus is a subjective synonym of Oreamnos' according to Hall and Kellogg 1955
- 'Haplomys belongs to Allomyidae' according to Miller and Gidley 1918
- 'Harrymys canadensis belongs to Harrymys' according to Korth 1995
- 'Heliscomys belongs to Protrogomorpha' according to Cope 1873
- 'Heliscomys woodi belongs to Heliscomys' according to McGrew 1941
- 'Hemiacodon belongs to Omomyidae' according to Marsh 1872
- 'Hemiauchenia belongs to Camelidae' according to Gervais and Ameghino 1880
- 'Hemicyon belongs to Ursidae' according to Lartet 1851
- 'Heptodon belongs to Ceratomorpha' according to Cope 1882
- 'Herpailurus belongs to Felinae' according to Severtzov 1858
- 'Hesperosorex belongs to Soricidae' according to Hibbard 1957
- 'Hesperosorex lovei belongs to Hesperosorex' according to Hibbard 1957
- 'Hipparion belongs to Equidae' according to de Christol 1832
- 'Hipparion (Nannippus) was reranked as Nannippus and belongs to Equidae' according to McGrew 1936
- 'Hippotherium belongs to Hipparionini'
- 'Hippotherium belongs to Equidae' according to Kaup 1833
- 'Hippotherium rectidens is a subjective synonym of Neohipparion eurystyle' according to Carranza-Castaneda 1993
- 'Hippotigris is a subjective synonym of Equus' according to Lundholm 1952
- 'Hippotigris is a subjective synonym of Equus' according to Lydekker 1916
- 'Hippotigris is a subjective synonym of Equus' according to Trouessart 1905
- 'Hippotigris is a subjective synonym of Equus' according to Sclater 1900
- 'Hippotigris belongs to ' according to Trumler 1961
- 'Hippotigris is a subjective synonym of Equus' according to Groves and Willoughby 1981
- 'Hippotigris is a subjective synonym of Equus' according to Azzaroli 1966
- 'Hippotigris is a subjective synonym of Equus' according to Ellerman et al. 1953
- 'Homacodon belongs to Artiodactyla' according to Marsh 1872
- 'Homogalax belongs to Isectolophidae' according to Hay 1899
- 'Homotherium belongs to Felidae' according to Fabrini 1890
- 'Hoplictis belongs to Mustelidae' according to Ginsburg and Morales 1992
- 'Hyaenodon belongs to Hyaenodontidae' according to Laizer and Parieu 1838
- 'Hyaenodon mustelinus belongs to Hyaenodon' according to Scott 1894
- 'Hydrochoerus belongs to Hydrochoeridae' according to Brisson 1762
- 'Hyopsodus acolytus is recombined as Promioclaenus acolytus' according to de Muizon and Cifelli 2000
- 'Hypertragulus belongs to Hypertragulidae' according to Cope 1873
- 'Hypertragulus heikeni belongs to Hypertragulus' according to Ferrusquia 1969
- 'Hypisodus belongs to Hypertragulidae' according to Cope 1873
- 'Hypolagus furlongi belongs to Hypolagus' according to Gazin 1934
- 'Hypolagus regalis belongs to Hypolagus' according to Hibbard 1939
- 'Hyrachyus belongs to Rhinocerotoidea' according to Leidy 1871
- 'Hyracodon browni belongs to Hyracodon' according to L. Russell 1934
- 'Hyracotherium belongs to Equidae' according to Owen 1841
- 'Hystricops browni belongs to Hystricops' according to Shotwell 1963
- 'Ictops bullatus belongs to Ictops' according to Matthew 1899
- 'Ilingoceros belongs to Antilocapridae' according to J. Merriam 1909
- 'Indarctos belongs to Ursidae' according to Pilgrim 1913
- 'Ischyromys belongs to Ischyromyidae' according to Leidy 1856
- 'Ischyrotomus littoralis belongs to Ischyrotomus' according to R. Wilson 1949
- 'Isectolophus belongs to Isectolophidae' according to Scott and Osborn 1887
- 'Jacobsomys belongs to Cricetidae' according to Czaplewski 1987
- 'Jacobsomys verdensis belongs to Jacobsomys' according to Czaplewski 1987
- 'Jepsenella praepropera belongs to Jepsenella' according to Simpson 1940
- 'Kansasimys belongs to Eomyidae' according to A. Wood 1936
- 'Kansasimys dubius belongs to Kansasimys' according to A. Wood 1936
- 'Kentrogomphios is a subjective synonym of Micropternodus' according to Asher et al. 2002
- 'Kentrogomphios strophensis is recombined as Micropternodus strophensis' according to Asher et al. 2002
- 'Labidolemur major belongs to Labidolemur' according to West 1972
- 'Lagurus belongs to Cricetidae' according to Gloger 1841
- 'Lantanotherium [misspelled as Lanthanotherium] belongs to Erinaceidae' according to Filhol 1888
- 'Lasiopodomys belongs to Cricetidae' according to Lataste 1887
- 'Lemmiscus belongs to Cricetidae' according to Goldman 1941
- 'Lemmus belongs to Cricetidae' according to Link 1795
- 'Lemmus sibiricus belongs to Lemmus' according to Ognev 1947
- 'Leptarctus belongs to Mustelidae' according to Leidy 1856
- 'Leptauchenia belongs to Merycoidodontidae' according to Leidy 1856
- 'Leptictis belongs to Leptictidae' according to Leidy 1868
- 'Leptictis haydeni belongs to Leptictis' according to Leidy 1868
- 'Leptochoerus belongs to Leptochoeridae' according to Leidy 1856
- 'Leptomeryx belongs to Leptomerycidae' according to Leidy 1853
- 'Leptoreodon belongs to Protoceratidae' according to Wortman 1898
- 'Leptotomus coelumensis is recombined as Mytonomys coelumensis' according to Korth 1988
- 'Leptotomus costilloi is recombined as Notoparamys costilloi' according to Wahlert 2000
- 'Leptotragulus belongs to Protoceratidae' according to Scott and Osborn 1887
- 'Lepus alleni belongs to Lepus' according to Mearns 1890
- 'Lepus americanus belongs to Lepus' according to Erxleben 1777
- 'Lepus aquaticus is recombined as Sylvilagus aquaticus' according to Halanych and T. Robinson 1997
- 'Lepus aquaticus is recombined as Sylvilagus aquaticus' according to T. Robinson 1984
- 'Lepus arcticus belongs to Lepus' according to Ross 1819
- 'Lepus californicus belongs to Lepus' according to Gray 1837
- 'Lepus callotis belongs to Lepus' according to Wagler 1830
- 'Lepus townsendii belongs to Lepus' according to Bachman 1839
- 'Limnocyon belongs to Limnocyonidae' according to Marsh 1872
- 'Limnonyx belongs to Mustelidae' according to Crusafont Pairo 1950
- 'Liodontia belongs to Aplodontidae' according to Miller and Gidley 1918
- 'Lophiotherium vasacciense is recombined as Hyracotherium vasacciense' according to Robinson 1966
- 'Lophiotherium vasacciense is recombined as Hyracotherium vasacciense' according to Kitts 1956
- 'Lophiotherium vasacciense is recombined as Hyracotherium vasacciense' according to Kelley and A. Wood 1954
- 'Loveina zephyri belongs to Loveina' according to Simpson 1940
- 'Lutra belongs to Mustelidae' according to Brisson 1762
- 'Macrocranion belongs to Dormaaliidae' according to Weitzel 1949
- 'Macrognathomys belongs to Zapodidae' according to Hall 1930
- 'Macrognathomys nanus belongs to Macrognathomys' according to Hall 1930
- 'Mammut belongs to Mammutidae' according to Blumenbach 1799
- 'Mammuthus belongs to Elephantidae' according to Brookes 1828
- 'Marmota belongs to Sciuridae' according to Frisch 1775
- 'Marsholestes belongs to Geolabididae' according to McKenna 1992
- 'Martes belongs to Mustelidae' according to Frisch 1775
- 'Martes kinseyi belongs to Martes' according to Gidley 1927
- 'Martes ogygia is recombined as Plionictis ogygia' according to Storer 1975
- 'Martes ogygia is recombined as Plionictis ogygia' according to Sutton 1977
- 'Martes oregonensis is recombined as Plionictis oregonensis' according to Sutton 1977
- 'Martinogale nambiana belongs to Martinogale' according to Hall 1930
- 'Mazama dorsata is a subjective synonym of Oreamnos americanus' according to Hall and Kelson 1959
- 'Mazama dorsata is a subjective synonym of Oreamnos americanus' according to Hall and Kellogg 1955
- 'Megacamelus belongs to Camelidae' according to Frick 1929
- 'Megalagus belongs to Leporidae' according to Walker 1931
- 'Megalagus dawsoni belongs to Megalagus' according to Black 1961
- 'Megalamynodon belongs to Amynodontidae' according to H. Wood 1945
- 'Megalamynodon regalis belongs to Megalamynodon' according to H. Wood 1945
- 'Megalesthonyx belongs to Esthonychidae' according to Rose 1971
- 'Megalesthonyx hopsoni belongs to Megalesthonyx' according to Rose 1971
- 'Megalonyx belongs to Megalonychidae' according to Harlan 1825
- 'Megalonyx leptostomus belongs to Megalonyx' according to Cioe 1893
- 'Megalonyx wheatleyi belongs to Megalonyx' according to Cope 1871
- 'Megantereon belongs to Felidae' according to Croizet and Jobert 1828
- 'Meniscoessus belongs to Taeniolabididae' according to Cope 1882
- 'Meniscomys milleri is recombined as Crucimys milleri' according to Rensberger 1982
- 'Meniscotherium belongs to Meniscotheriidae' according to Cope 1874
- 'Meniscotherium chamense belongs to Meniscotherium' according to Cope 1874
- 'Mentoclaenodon belongs to Arctocyonidae' according to Weigelt 1960
- 'Mephitis belongs to Mustelidae' according to Geoffroy and Cuvier 1795
- 'Mephitis macroura belongs to Mephitis' according to Lichtenstein 1832
- 'Merychippus belongs to Equidae' according to Leidy 1856
- 'Merychippus insignis belongs to Merychippus' according to Hay 1930
- 'Merychyus belongs to Merycoidodontidae' according to Leidy 1858
- 'Merycochoerus belongs to Merycoidodontidae' according to Leidy 1858
- 'Mesocyon robustus is recombined as Enhydrocyon robustus' according to C. C. Swisher 1982
- 'Mesocyon robustus is recombined as Enhydrocyon robustus' according to C. C. Swisher 1982
- 'Mesodma thompsoni belongs to Mesodma' according to Clemens 1964
- 'Mesogaulus belongs to Mylagaulidae' according to Riggs 1899
- 'Mesogaulus ballensis belongs to Mesogaulus' according to Riggs 1899
- 'Microdipodops belongs to Geomyidae' according to Merriam 1891
- 'Microeutypomys belongs to Eutypomyidae' according to Walton 1993
- 'Microeutypomys karenae belongs to Microeutypomys' according to Walton 1993
- 'Microparamys sambucus belongs to Microparamys' according to Korth and Emry 1989
- 'Microsyops belongs to Microsyopidae' according to Leidy 1872
- 'Microtoscoptes belongs to Cricetidae' according to Schaub 1934
- 'Microtus belongs to Cricetidae' according to Schrank 1798
- 'Microtus miurus belongs to Microtus' according to Osgood 1901
- 'Mimomys belongs to Cricetidae' according to Forsyth Major 1902
- 'Mioclaenus lemuroides is recombined as Promioclaenus lemuroides' according to de Muizon and Cifelli 2000
- 'Miolabis belongs to Camelidae' according to Hay 1899
- 'Miomustela belongs to Mustelidae' according to Hall 1930
- 'Mithrandir belongs to Periptychidae' according to Cifelli 1983
- 'Mixodectes belongs to Mixodectidae' according to Cope 1883
- 'Mixotoxodon belongs to Toxodontidae' according to Frank 1957
- 'Monosaulax skinneri belongs to Monosaulax' according to Stout 1999
- 'Montanamus belongs to Eomyidae' according to Ostrander 1983
- 'Montanamus bjorki belongs to Montanamus' according to Ostrander 1983
- 'Mormoops megaphylla belongs to Mormoops' according to Peters 1864
- 'Mus oeconomus belongs to Mus' according to Pallas 1776
- 'Mustela eversmanni belongs to Mustela' according to Lesson 1827
- 'Mustela frenata belongs to Mustela' according to Lichtenstein 1831
- 'Mustela nivalis belongs to Mustela' according to Linnaeus 1766
- 'Mylagaulus belongs to Mylagaulidae' according to Cope 1878
- 'Mylohyus belongs to Tayassuidae' according to Cope 1869
- 'Myotis grisecens belongs to Myotis' according to A. Howell 1909
- 'Myotis mangamolaris belongs to Myotis' according to Choate and Hall 1967
- 'Myotis rectidens belongs to Myotis' according to Choate and Hall 1967
- 'Myotis sodalis belongs to Myotis' according to Miller and G. Allen 1928
- 'Myotis thysanodes belongs to Myotis' according to Miller 1897
- 'Myrmecoboides belongs to Leptictidae' according to Gidley 1915
- 'Myrmecoboides montanensis belongs to Myrmecoboides' according to Gidley 1915
- 'Mystipterus belongs to Talpidae' according to Hall 1930
- 'Mystipterus vespertilio belongs to Mystipterus' according to Hall 1930
- 'Nanomeryx caudatus is recombined as Homacodon caudatus' according to Lucas 1983
- 'Nanotragulus belongs to Hypertragulidae' according to Lull 1922
- 'Napaeozapus belongs to Zapodidae' according to G. Miller 1900
- 'Nasua belongs to Procyonidae' according to Storr 1780
- 'Neochoerus belongs to Hydrochoeridae' according to Hay 1926
- 'Neofiber belongs to Cricetidae' according to F. W. True 1884
- 'Neofiber alleni belongs to Neofiber' according to True 1884
- 'Neofiber leonardi belongs to Neofiber' according to Hibbard 1943
- 'Neoplagiaulax belongs to Ptilodontidae' according to Lemoine 1882
- 'Neotamias belongs to ' according to Jameson 1999
- 'Neotoma belongs to Cricetidae' according to Say and Ord 1825
- 'Neotoma albigula belongs to Neotoma' according to Hartley 1894
- 'Neotoma fuscipes belongs to Neotoma' according to Baird 1858
- 'Neotoma lepida belongs to Neotoma' according to Thomas 1893
- 'Neotoma mexicana belongs to Neotoma' according to Baird 1855
- 'Neotoma micropus belongs to Neotoma' according to Baird 1855
- 'Neotoma ozarkensis belongs to Neotoma' according to Brown 1908
- 'Neotoma stephensi belongs to Neotoma' according to Goldman 1905
- 'Neotomodon belongs to ' according to Merriam 1898
- 'Neotomodon alstoni belongs to Neotomodon' according to Merriam 1898
- 'Neurotrichus belongs to Talpidae' according to Gunther 1880
- 'Niglarodon belongs to Aplodontidae' according to Black 1961
- 'Niglarodon koerneri belongs to Niglarodon' according to Black 1961
- 'Nimravus belongs to Nimravidae' according to Cope 1879
- 'Niptomomys favorum belongs to Niptomomys' according to Strait 2001
- 'Nothrotheriops belongs to Megatheriidae' according to Paula Couto 1971
- 'Notiosorex belongs to Soricidae' according to Baird 1877
- 'Notiotitanops mississippiensis belongs to Notiotitanops' according to Gazin and Sullivan 1942
- 'Nyctitherium belongs to Nyctitheriidae' according to Marsh 1872
- 'Ochotona belongs to Ochotonidae' according to Link 1795
- 'Ochrotomys belongs to Cricetidae' according to Hooper 1958
- 'Odocoileus belongs to Cervidae' according to Rafinesque 1832
- 'Odocoileus brachyodontus belongs to Odocoileus' according to Oelrich 1953
- 'Oligobunis belongs to Mustelidae' according to Cope 1881
- 'Onager is a subjective synonym of Equus' according to Groves and Willoughby 1981
- 'Ondatra belongs to Cricetidae' according to Link 1795
- 'Onychomys belongs to Cricetidae' according to Baird 1858
- 'Oodectes belongs to Miacidae' according to Wortman 1901
- 'Oreamnos belongs to Bovidae' according to Rafinesque 1817
- 'Oregonomys belongs to Heteromyidae' according to Martin 1984
- 'Oregonomys pebblespringsensis belongs to Oregonomys' according to Martin 1984
- 'Oreolagus nebrascensis belongs to Oreolagus' according to McGrew 1941
- 'Oromeryx belongs to Oromerycidae' according to Marsh 1894
- 'Orthogeomys belongs to Geomyidae' according to C. Merriam 1895
- 'Oryzomys belongs to Cricetidae' according to Baird 1857
- 'Oryzomys palustris belongs to Oryzomys' according to Harlan 1837
- 'Osmotherium belongs to Mustelidae' according to Cope 1896
- 'Osmotherium spelaeum belongs to Osmotherium' according to Cope 1896
- 'Ovibos belongs to Bovidae' according to Blainville 1816
- 'Ovis canadensis belongs to Ovis' according to Shaw 1804
- 'Ovis dalli belongs to Ovis' according to Nelson 1884
- 'Ovis montanus is a subjective synonym of Oreamnos americanus' according to Hall and Kelson 1959
- 'Ovis montanus is a subjective synonym of Oreamnos americanus' according to Hall and Kellogg 1955
- 'Oxyacodon belongs to Periptychidae' according to Osborn and Earle 1895
- 'Oxyacodon apiculatus belongs to Oxyacodon' according to Osborn and Earle 1895
- 'Oxyaena forcipata belongs to Oxyaena' according to Cope 1874
- 'Pachyaena gigantea belongs to Pachyaena' according to Osborn and Wortman 1892
- 'Paciculus belongs to Cricetidae' according to Cope 1879
- 'Paciculus montanus belongs to Paciculus' according to Black 1961
- 'Pagonomus belongs to Pantolestidae' according to D. Russell 1964
- 'Palaechthon alticuspis belongs to Palaechthon' according to Gidley 1923
- 'Palaeocastor belongs to Castoridae' according to Leidy 1869
- 'Palaeoerinaceus belongs to ' according to Filhol 1897
- 'Palaeogale belongs to Carnivora' according to von Meyer 1846
- 'Palaeolagus belongs to Leporidae' according to Leidy 1856
- 'Palaeolagus haydeni belongs to Palaeolagus' according to Leidy 1856
- 'Palaeolagus hypsodus belongs to Palaeolagus' according to Schlaikjer 1935
- 'Palaeolama belongs to Camelidae' according to Gervais 1869
- 'Palaeonictis belongs to Oxyaenidae' according to De Blainville 1842
- 'Palaeonictis occidentalis belongs to Palaeonictis' according to Osborn 1892
- 'Palaeoryctes belongs to Palaeoryctidae' according to Matthew 1913
- 'Palaeoryctes puercensis belongs to Palaeoryctes' according to Matthew 1913
- 'Palaeosinopa belongs to Pantolestidae' according to Matthew 1901
- 'Pampatherium belongs to Dasypodidae' according to Ameghino 1891
- 'Panolax belongs to Leporidae' according to Cope 1874
- 'Panthera belongs to Felidae' according to Oken 1816
- 'Pantolambda cavirictus belongs to Pantolambda' according to Cope 1883
- 'Pantolestes belongs to Pantolestidae' according to Cope 1872
- 'Pappogeomys belongs to Geomyidae' according to C. Merriam 1895
- 'Pappogeomys alcorni belongs to Pappogeomys' according to R. Russell 1957
- 'Paradjidaumo belongs to Eomyidae' according to Burke 1934
- 'Paradjidaumo validus belongs to Paradjidaumo' according to Korth 1980
- 'Parahyus belongs to Helohyidae' according to Marsh 1876
- 'Parailurus belongs to Procyonidae' according to Schlosser 1899
- 'Paramys belongs to Ischyromyidae' according to Leidy 1871
- 'Paramys compressidens belongs to Paramys' according to Korth 1988
- 'Paramys copei belongs to Paramys' according to Loomis 1907
- 'Paramys delicatus belongs to Paramys' according to Leidy 1871
- 'Paramys excavatus belongs to Paramys' according to Loomis 1907
- 'Paramys petersoni is recombined as Pseudotomus petersoni' according to Wahlert 2000
- 'Paranamatomys belongs to Eomyidae' according to Korth 1992
- 'Parascalops belongs to Talpidae' according to True 1894
- 'Parataxidea belongs to Mustelidae' according to Zdansky 1924
- 'Parectypodus lovei is recombined as Ectypodus lovei' according to Storer 1993
- 'Paromomys belongs to Paromomyidae' according to Gidley 1923
- 'Paromomys alticuspis belongs to Paromomys' according to Gidley 1923
- 'Paromomys depressidens belongs to Paromomys' according to Gidley 1923
- 'Paromomys maturus belongs to Paromomys' according to Gidley 1923
- 'Patriofelis belongs to Oxyaenidae' according to Leidy 1870
- 'Patriofelis ulta belongs to Patriofelis' according to Leidy 1870
- 'Pauromys exallos belongs to Pauromys' according to Korth and Emry 1989
- 'Pauromys simplex belongs to Pauromys' according to Walton 1993
- 'Pauromys texensis belongs to Pauromys' according to Walton 1993
- 'Pecari belongs to Tayassuidae' according to Reichenbach 1835
- 'Pediohyus is a subjective synonym of Hesperhys' according to McKenna and Bell 1997
- 'Pediohyus is a subjective synonym of Desmathyus' according to Dalquest and Mooser 1980
- 'Pediohyus ferus is recombined as Hesperhys ferus' according to McKenna and Bell 1997
- 'Pediohyus ferus is recombined as Desmathyus ferus' according to Dalquest and Mooser 1980
- 'Pelycodus schidelerorum is a subjective synonym of Pelycodus danielsae' according to Gunnell 2002
- 'Peraceras belongs to Rhinocerotidae' according to Cope 1880
- 'Peratherium belongs to Didelphidae' according to Aymard 1850
- 'Perchoerus belongs to Tayassuidae' according to Leidy 1869
- 'Perognathus belongs to Heteromyidae' according to Maximillian 1839
- 'Perognathus dunklei belongs to Perognathus' according to Hibbard 1939
- 'Perognathus flavescens belongs to Perognathus' according to Osgood 1900
- 'Perognathus flavus belongs to Perognathus' according to Baird 1855
- 'Perognathus inornatus belongs to Perognathus' according to Merriam 1889
- 'Perognathus mclaughlini belongs to Perognathus' according to Hibbard 1949
- 'Perognathus merriami belongs to Perognathus' according to Allen 1892
- 'Perognathus trojectioansrum belongs to Perognathus' according to Korth 1979
- 'Peromyscus belongs to Cricetidae' according to Gloger 1841
- 'Peromyscus antiquus belongs to Peromyscus' according to Kellogg 1910
- 'Peromyscus anyapahensis belongs to Peromyscus' according to J. White 1966
- 'Peromyscus cragini belongs to Peromyscus' according to Hibbard 1944
- 'Peromyscus cumberlandensis belongs to Peromyscus' according to Guilday and Handley 1967
- 'Peromyscus imperfectus belongs to Peromyscus' according to Dice 1925
- 'Peromyscus pectoralis belongs to Peromyscus' according to Osgood 1904
- 'Petenyia belongs to Soricidae' according to Kormos 1934
- 'Phaiomys belongs to ' according to Blyth 1863
- 'Phenacodus belongs to Phenacodontidae' according to Cope 1873
- 'Phenacodus intermedius belongs to Phenacodus' according to Bown 1979
- 'Phenacodus intermedius is a subjective synonym of Phenacodus primaeous' according to West 1976
- 'Phenacomys belongs to Cricetidae' according to Merriam 1889
- 'Phenacomys gryci belongs to Phenacomys' according to Repenning 1987
- 'Phenacomys intermedius belongs to Phenacomys' according to Merriam 1889
- 'Philotrox belongs to Canidae' according to J. Merriam 1906
- 'Phlaocyon belongs to Canidae' according to Matthew 1899
- 'Phlaocyon leucosteus belongs to Phlaocyon' according to Matthew 1899
- 'Phlaocyon marslandensis belongs to Phlaocyon' according to McGrew 1941
- 'Phoberocyon belongs to Ursidae' according to Ginsburg 1955
- 'Plagioctenodon belongs to Nyctitheriidae' according to Bown 1979
- 'Plagioctenodon krausae belongs to Plagioctenodon' according to Bown 1979
- 'Plagioctenoides belongs to Nyctitheriidae' according to Bown 1979
- 'Plagioctenoides microlestes belongs to Plagioctenoides' according to Bown 1979
- 'Platybelodon belongs to Gomphotheriidae' according to Borissiak 1928
- 'Platygonus belongs to Tayassuidae' according to Le Conte 1848
- 'Platygonus compressus belongs to Platygonus' according to J. L. Le Conte 1848
- 'Plecotus townsendii belongs to Plecotus' according to Cooper 1837
- 'Plesiadapis belongs to Plesiadapidae' according to Gervais 1877
- 'Plesictis belongs to Procyonidae' according to Pomel 1846
- 'Plesiogulo belongs to Mustelidae' according to Zdansky 1934
- 'Plesiosminthus belongs to Zapodidae' according to Viret 1926
- 'Plesiosorex belongs to Plesiosoricidae' according to Pomel 1848
- 'Plesiosorex coloradensis belongs to Plesiosorex' according to R. Wilson 1960
- 'Plesispermophilus belongs to Allomyidae' according to Filhol 1883
- 'Pliauchenia belongs to Camelidae' according to Cope 1875
- 'Pliogale belongs to Mustelidae' according to Hall 1930
- 'Pliolemmus belongs to Cricetidae' according to Hibbard 1937
- 'Plionarctos belongs to Ursidae' according to Frick 1926
- 'Plionarctos edensis belongs to Plionarctos' according to Frick 1926
- 'Plithocyon belongs to Ursidae' according to Ginsburg 1955
- 'Poebrotherium belongs to Camelidae' according to Leidy 1847
- 'Potamotelses belongs to Potamotelsidae' according to Fox 1972
- 'Potamotelses aquilensis belongs to Potamotelses' according to Fox 1972
- 'Praeovibos belongs to Bovidae' according to Staudinger 1908
- 'Praeovibos priscus belongs to Praeovibos' according to Staudinger 1908
- 'Pratilepus belongs to Leporidae' according to Hibbard 1939
- 'Pratilepus kansasensis belongs to Pratilepus' according to Hibbard 1939
- 'Presbymys belongs to Protoptychidae' according to R. Wilson 1949
- 'Presbymys lophatus belongs to Presbymys' according to R. Wilson 1949
- 'Priscocamelus belongs to Camelidae' according to Stevens 1969
- 'Procadurcodon belongs to Amynodontidae' according to Gromova 1960
- 'Procamelus belongs to Camelidae' according to Leidy 1858
- 'Procaprolagus belongs to Leporidae' according to Gureev 1960
- 'Procynodictis belongs to Miacidae' according to Wortman and Matthew 1899
- 'Procyon belongs to Procyonidae' according to Storr 1780
- 'Prodiacodon belongs to Leptictidae' according to Matthew 1929
- 'Prodinoceras belongs to Prodinoceratidae' according to Matthew et al. 1929
- 'Prodipodomys belongs to Heteromyidae' according to Hibbard 1939
- 'Proheteromys sulculus belongs to Proheteromys' according to R. Wilson 1960
- 'Promioclaenus belongs to Mioclaenidae' according to Trouessart 1904
- 'Promylagaulus belongs to Mylagaulidae' according to McGrew 1941
- 'Promylagaulus riggsi belongs to Promylagaulus' according to McGrew 1941
- 'Pronothodectes belongs to Plesiadapidae' according to Gidley 1923
- 'Pronothodectes matthewi belongs to Pronothodectes' according to Gidley 1923
- 'Prosciurus albiclivus belongs to Prosciurus' according to Korth 1994
- 'Prosciurus lohiculus belongs to Prosciurus' according to Matthew and Granger 1923
- 'Prosigmodon holocuspis belongs to Prosigmodon' according to Czaplewski 1987
- 'Protapirus belongs to Tapiridae' according to Filhol 1877
- 'Protemnocyon belongs to Amphicyonidae' according to Hatcher 1901
- 'Proterix belongs to Erinaceidae' according to Matthew 1903
- 'Proterix loomisi belongs to Proterix' according to Matthew 1903
- 'Protictis vanvaleni is recombined as Intyrictis vanvaleni' according to Meehan and Wilson 2002
- 'Protitanops belongs to Brontotheridae' according to Stock 1936
- 'Protolabis belongs to Camelidae' according to Cope 1876
- 'Protoprocyon belongs to Procyonidae' according to Linares 1982
- 'Protoprocyon savagei belongs to Protoprocyon' according to Linares 1982
- 'Protoptychus belongs to Protoptychidae' according to Scott 1895
- 'Protoptychus hatcheri belongs to Protoptychus' according to Scott 1895
- 'Protoreodon belongs to Agriochoeridae' according to Scott and Osborn 1887
- 'Protoreodon parvus belongs to Protoreodon' according to Scott and Osborn 1887
- 'Protospermophilus belongs to Sciuridae' according to M. Bryant 1945
- 'Protylopus belongs to Camelidae' according to Wortman 1898
- 'Protylopus petersoni belongs to Protylopus' according to Wortman 1898
- 'Proviverra belongs to Hyaenodontidae' according to Rutimeyer 1862
- 'Pseudaelurus belongs to Felidae' according to Gervais 1848
- 'Pseudaelurus hibbardi belongs to Pseudaelurus' according to Dalquest 1969
- 'Pseudaelurus pedionomus belongs to Pseudaelurus' according to Macdonald 1948
- 'Pseudocylindrodon belongs to Cylindrodontidae' according to Burke 1935
- 'Pseudocylindrodon medius belongs to Pseudocylindrodon' according to Burke 1938
- 'Pseudocylindrodon neglectus belongs to Pseudocylindrodon' according to Burke 1935
- 'Pseudocyon belongs to Amphicyonidae' according to Lartet 1851
- 'Pseudotetonius is a subjective synonym of Tetonius' according to Gingerich 1981
- 'Pseudotetonius is a subjective synonym of Tetonius' according to Gingerich 1980
- 'Pseudotheridomys belongs to Eomyidae' according to Schlosser 1926
- 'Pseudotheridomys hesperus belongs to Pseudotheridomys' according to R. Wilson 1960
- 'Pseudotrimylus belongs to Soricidae' according to Gureev 1971
- 'Psittacotherium belongs to Stylinodontidae' according to Cope 1882
- 'Psittacotherium multifragum belongs to Psittacotherium' according to Cope 1882
- 'Pterodon belongs to Hyaenodontidae' according to Blainville 1839
- 'Ptilodus belongs to Ptilodontidae' according to Cope 1881
- 'Puma belongs to Felidae' according to Jardine 1834
- 'Putorius nigripes belongs to Putorius' according to Audubon and Bachman 1851
- 'Ragnarok is a subjective synonym of Baioconodon' according to de Muizon and Cifelli 2000
- 'Ragnarok engdahli is recombined as Baioconodon engdahli' according to de Muizon and Cifelli 2000
- 'Ragnarok harbichti is a subjective synonym of Baioconodon nordicus' according to de Muizon and Cifelli 2000
- 'Ragnarok wovokae is recombined as Baioconodon wovokae' according to de Muizon and Cifelli 2000
- 'Rangifer belongs to Cervidae' according to Hamilton-Smith 1827
- 'Reithrodontomys belongs to Cricetidae' according to Giglioli 1874
- 'Reithrodontomys fulvescens belongs to Reithrodontomys' according to Allen 1894
- 'Rhynchotherium belongs to Gomphotheriidae' according to Falconer 1868
- 'Saiga belongs to Bovidae' according to Gray 1843
- 'Saxonella belongs to Plesiadapidae' according to D. Russell 1964
- 'Scalopoides belongs to Talpidae' according to R. Wilson 1960
- 'Scalopoides isodens belongs to Scalopoides' according to R. Wilson 1960
- 'Scalopus belongs to Talpidae' according to Geoffroy 1803
- 'Scapanus belongs to Talpidae' according to Pomel 1848
- 'Scapanus orarius belongs to Scapanus' according to True 1896
- 'Schizodontomys belongs to Heteromyidae' according to Rensberger 1973
- 'Schizodontomys greeni belongs to Schizodontomys' according to Rensberger 1973
- 'Schizodontomys sulcidens belongs to Schizodontomys' according to Rensberger 1973
- 'Schizotherium belongs to Chalicotheriidae' according to Gervais 1879
- 'Sciuravus bridgeri belongs to Sciuravus' according to R. Wilson 1938
- 'Sciuravus eucristadens belongs to Sciuravus' according to Burke 1937
- 'Sciuropterus belongs to Sciuridae' according to Cuvier 1825
- 'Sciurus (Prosciurus) was reranked as Prosciurus and belongs to Allomyidae' according to Matthew 1910
- 'Sciurus aberti belongs to Sciurus' according to Woodhouse 1853
- 'Sciurus alleni belongs to Sciurus' according to Nelson 1898
- 'Sciurus arizonensis belongs to Sciurus' according to Coues 1867
- 'Sciurus carolinensis belongs to Sciurus' according to Gmelin 1788
- 'Sciurus griseus belongs to Sciurus' according to Ord 1818
- 'Scottimus ambiguus belongs to Scottimus' according to Korth 1981
- 'Scottimus kellamorum belongs to Scottimus' according to Black 1961
- 'Scottimus longiquus belongs to Scottimus' according to Korth 1981
- 'Scottimus viduus belongs to Scottimus' according to Korth 1981
- 'Shoshonius belongs to Anaptomorphidae' according to Granger 1910
- 'Shoshonius cooperi belongs to Shoshonius' according to Granger 1910
- 'Sigmodon belongs to Cricetidae' according to Say and Ord 1825
- 'Sigmodon bakeri belongs to Sigmodon' according to R. Martin 1974
- 'Sigmodon hispidus belongs to Sigmodon' according to Say and Ord 1825
- 'Sigmodon libitinus belongs to Sigmodon' according to R. Martin 1979
- 'Sigmodon ochrognathus belongs to Sigmodon' according to Bailey 1902
- 'Simimys belongs to Simimyidae' according to R. Wilson 1935
- 'Simocyon belongs to Procyonidae' according to Wagner 1858
- 'Simocyon primigenius belongs to Simocyon' according to Wagner 1858
- 'Sinclairella belongs to Apatemyidae' according to Jepsen 1934
- 'Sinclairella dakotensis belongs to Sinclairella' according to Jepsen 1934
- 'Sinopa major belongs to Sinopa' according to Gustafson 1998
- 'Sinopa rapax belongs to Sinopa' according to Leidy 1871
- 'Smilodectes gingerichi is a subjective synonym of Cantius angulatus' according to Gunnell 2002
- 'Smilodectes sororis belongs to Smilodectes' according to Gunnell 2002
- 'Smilodon belongs to Felidae' according to Lund 1841
- 'Soergelia belongs to Bovidae' according to Schaub 1951
- 'Sorex arcticus belongs to Sorex' according to Kerr 1792
- 'Sorex arizonae belongs to Sorex' according to Diersing and Hoffmeister 1977
- 'Sorex cinereus belongs to Sorex' according to Kerr 1792
- 'Sorex cudahyensis belongs to Sorex' according to Hibbard 1944
- 'Sorex dispar belongs to Sorex' according to Batchelder 1896
- 'Sorex fumeus belongs to Sorex' according to Miller 1895
- 'Sorex leahyi belongs to Sorex' according to Hibbard 1956
- 'Sorex longirostris belongs to Sorex' according to Bachman 1837
- 'Sorex merriami belongs to Sorex' according to Dobson 1890
- 'Sorex monticolus belongs to Sorex' according to Merriam 1890
- 'Sorex ornatus belongs to Sorex' according to Merriam 1895
- 'Sorex palustris belongs to Sorex' according to Richardson 1828
- 'Sorex rexroadensis belongs to Sorex' according to Hibbard 1953
- 'Sorex sandersi belongs to Sorex' according to Hibbard 1956
- 'Sorex saussurei belongs to Sorex' according to Merriam 1892
- 'Sorex taylori belongs to Sorex' according to Hibbard 1937
- 'Sorex trowbridgii belongs to Sorex' according to Baird 1858
- 'Sorex vagrans belongs to Sorex' according to Baird 1858
- 'Sorex vireti is recombined as Angustidens vireti' according to Sutton 1977
- 'Spermophilus belongs to Sciuridae' according to Cuvier 1825
- 'Spermophilus armatus belongs to Spermophilus' according to Kennicott 1863
- 'Spermophilus boothi belongs to Spermophilus' according to Hibbard 1972
- 'Spermophilus johnstoni belongs to Spermophilus' according to Hibbard 1972
- 'Spermophilus lorisrusselli belongs to Spermophilus' according to Hibbard 1976
- 'Spermophilus meltoni belongs to Spermophilus' according to Hibbard 1972
- 'Spermophilus spilosoma belongs to Spermophilus' according to Bennett 1833
- 'Spermophilus townsendii belongs to Spermophilus' according to Bachman 1839
- 'Sphenocoelus belongs to Brontotheridae' according to Osborn 1895
- 'Sphenophalos belongs to Antilocapridae' according to J. Merriam 1909
- 'Spilogale belongs to Mustelidae' according to Gray 1865
- 'Stegomastodon belongs to Gomphotheriidae' according to Pohlig 1912
- 'Stehlinius is a subjective synonym of Apatemys' according to West 1973
- 'Steneofiber belongs to Castoridae' according to Geoffroy 1833
- 'Sthenodectes belongs to Brontotheridae' according to Gregory 1912
- 'Stibarus belongs to Leptochoeridae' according to Cope 1873
- 'Stylinodon belongs to Stylinodontidae' according to Marsh 1874
- 'Stylinodon inexplicatus belongs to Stylinodon' according to Schoch and Lucas 1981
- 'Sylvilagus belongs to Leporidae' according to Gray 1867
- 'Sylvilagus leonensis belongs to Sylvilagus' according to Cushing 1945
- 'Synaptomys belongs to Cricetidae' according to Baird 1858
- 'Synaptomys australis belongs to Synaptomys' according to Simpson 1928
- 'Synaptomys bunkeri belongs to Synaptomys' according to Hibbard 1939
- 'Synaptomys cooperi belongs to Synaptomys' according to Baird 1858
- 'Synoplotherium belongs to Mesonychidae' according to Cope 1872
- 'Synoplotherium lanius belongs to Synoplotherium' according to Cope 1872
- 'Tadarida constantinei belongs to Tadarida' according to Lawrence 1960
- 'Taeniolabis belongs to Taeniolabididae' according to Cope 1882
- 'Tamias belongs to Sciuridae' according to Illinger 1811
- 'Tamias leucurus is recombined as Ammospermophilus leucurus' according to Merriam 1889
- 'Tamiasciurus belongs to Sciuridae' according to Trouessart 1880
- 'Tapiravus polkensis is recombined as Tapirus polkensis' according to Hulbert 1999
- 'Tapirus belongs to Tapiridae' according to Brisson 1762
- 'Tapirus haysii californicus is recombined as Tapirus californicus' according to Simpson 1945
- 'Tapirus veroensis belongs to Tapirus' according to Sellards 1918
- 'Tarka belongs to Plagiomenidae' according to McKenna 1990
- 'Tarka stylifera belongs to Tarka' according to McKenna 1990
- 'Tarkadectes belongs to Ekgmowechashalinae' according to McKenna 1990
- 'Tarkadectes montanensis belongs to Tarkadectes' according to McKenna 1990
- 'Taxidea belongs to Mustelidae' according to Waterhouse 1839
- 'Taxidea mexicana belongs to Taxidea' according to Drescher 1939
- 'Taxymys progressus belongs to Taxymys' according to R. Wilson 1938
- 'Tayassu belongs to Tayassuidae' according to Fischer 1814
- 'Teleoceras felicis belongs to Teleoceras' according to Freudenberg 1921
- 'Teleoceras hicksi belongs to Teleoceras' according to Cook 1927
- 'Teleoceras minor belongs to Teleoceras' according to Mead 1999
- 'Telmatherium belongs to Brontotheridae' according to Marsh 1872
- 'Telmatherium accola belongs to Telmatherium' according to Cook 1926
- 'Telmatherium advocata belongs to Telmatherium' according to Cook 1926
- 'Temnocyon belongs to Amphicyonidae' according to Cope 1879
- 'Temnocyon altigenis belongs to Temnocyon' according to Cope 1879
- 'Temnocyon ferox belongs to Temnocyon' according to Eyermann 1896
- 'Tenudomys belongs to Geomyidae' according to Rensberger 1973
- 'Tenudomys macdonaldi belongs to Tenudomys' according to Rensberger 1973
- 'Terricola belongs to Cricetidae' according to Fatio 1867
- 'Tetrapassalus proius belongs to Tetrapassalus' according to West 1973
- 'Thinobadistes belongs to Mylodontidae' according to Hay 1919
- 'Thinobadistes segnis belongs to Thinobadistes' according to Hay 1919
- 'Thisbemys brevicrista belongs to Thisbemys' according to Ostrander 1986
- 'Thomomys belongs to Geomyidae' according to Wied-Neuwied 1839
- 'Thomomys microdon belongs to Thomomys' according to Sinclair 1905
- 'Thomomys orientalis belongs to Thomomys' according to Simpson 1928
- 'Tillomys belongs to Sciuravidae' according to Marsh 1872
- 'Tinodon belongs to Tinodontidae' according to O. C. Marsh 1879
- 'Tisisthenes parvus belongs to Tisisthenes' according to R. Martin 1973
- 'Titanoides belongs to Titanoideidae' according to Gidley 1917
- 'Tomarctus belongs to Canidae' according to Cope 1873
- 'Tremarctos belongs to Ursidae' according to Gervais 1855
- 'Trigonias belongs to Rhinocerotidae' according to F. Lucas 1900
- 'Triplopus belongs to Hyracodontidae' according to Cope 1880
- 'Tritemnodon belongs to Hyaenodontidae' according to Matthew 1906
- 'Trogosus belongs to Esthonychidae' according to Leidy 1871
- 'Tubulodon belongs to Epoicotheriidae' according to Jepsen 1932
- 'Tubulodon taylori belongs to Tubulodon' according to Jepsen 1932
- 'Uintatherium belongs to Uintatheriidae' according to Leidy 1872
- 'Unuchinia belongs to Apatemyidae' according to Simpson 1937
- 'Urocyon belongs to Canidae' according to Baird 1857
- 'Urocyon progressus belongs to Urocyon' according to Stevens 1965
- 'Ursavus belongs to Ursidae' according to Schlosser 1899
- 'Ursavus brevirhinus belongs to Ursavus' according to Hofmann 1887
- 'Ursavus pawniensis belongs to Ursavus' according to Frick 1926
- 'Ursavus primaevus belongs to Ursavus' according to Gaillard 1899
- 'Ursus americanus belongs to Ursus' according to Pallas 1780
- 'Ursus maritimus belongs to Ursus' according to Phipps 1774
- 'Valenia belongs to Mioclaenidae' according to de Muizon and Cifelli 2000
- 'Viverravus gracilis belongs to Viverravus' according to Marsh 1872
- 'Vulpavus belongs to Miacidae' according to Marsh 1871
- 'Vulpavus palustris belongs to Vulpavus' according to Marsh 1871
- 'Wilsoneumys belongs to Cricetidae' according to L. Martin 1980
- 'Wortmania belongs to Stylinodontidae' according to Hay 1899
- 'Yoderimys yarmeri belongs to Yoderimys' according to J. Wilson and Runkel 1991
- 'Ysengrinia belongs to Amphicyonidae' according to Ginsburg 1965
- 'Zanycteris belongs to Picrodontidae' according to Matthew 1917
- 'Zanycteris paleocenus belongs to Zanycteris' according to Matthew 1917
- 'Zapus belongs to Zapodidae' according to Coues 1876
- 'Zapus princeps belongs to Zapus' according to Allen 1893
- 'Zapus rinkeri belongs to Zapus' according to Hibbard 1951
- 'Zapus sandersi belongs to Zapus' according to Hibbard 1956
- 'Zygiocuspis belongs to Trituberculata' according to Cifelli 1990
- 'Zygiocuspis goldingi belongs to Zygiocuspis' according to Cifelli 1990