Opinions from M. C. McKenna and S. K. Bell 1997
- 'Abderites belongs to Caenolestidae'
- 'Abelmoschomys belongs to Cricetidae'
- 'Absarokius belongs to Omomyidae'
- 'Acantharodeia belongs to Dasypodidae'
- 'Acantharodeia spicata is a subjective synonym of Macrochorobates scalabrinii' according to G. J. Scillato Yané 1980
- 'Acarechimys belongs to Echimyidae'
- 'Acaremys belongs to Octodontidae'
- 'Acdestis belongs to Caenolestidae'
- 'Acheronodon belongs to Eucosmodontidae'
- 'Achlysictis belongs to Thylacosmilidae'
- 'Achtiaria is a subjective synonym of Palaeotragus'
- 'Acmeodon belongs to Cimolestidae'
- 'Acoessus belongs to Dichobunoidea'
- 'Acomys belongs to Muridae'
- 'Acotherulum belongs to Cebochoeridae'
- 'Acritoparamys belongs to Ischyromyidae'
- 'Acrobates belongs to Burramyidae'
- 'Acrocyon belongs to Borhyaenidae'
- 'Acrodelphidae is corrected as Acrodelphinidae and belongs to Odontoceti' according to Rice 1984
- 'Acrodelphis belongs to Acrodelphinidae'
- 'Acrophoca belongs to Lobodontina'
- 'Actenomys belongs to Ctenomyidae'
- 'Adaetontherium is a subjective synonym of Conohyus'
- 'Adapis belongs to Adapidae'
- 'Adelomyarion belongs to Cricetidae'
- 'Adelpharctos belongs to Phocoidea'
- 'Adelphomys belongs to Echimyidae'
- 'Adinodon belongs to Marsupialia'
- 'Adjidaumo belongs to Eomyidae'
- 'Advenimus belongs to Ctenodactylidae'
- 'Aegialodon belongs to Aegialodontidae'
- 'Aegialodontidae belongs to Trituberculata'
- 'Aelurogale is a subjective synonym of Nimravus'
- 'Aenigmadelphys belongs to Marsupialia'
- 'Aeolopithecus belongs to Hylobatidae'
- 'Aepinacodon belongs to Anthracotheriidae'
- 'Aepycamelinae belongs to Camelidae'
- 'Aepyprymnus belongs to Macropodidae'
- 'Aethomylos belongs to Trituberculata'
- 'Aethomys belongs to Muridae'
- 'Aetiocetidae belongs to Mysticeti'
- 'Aetiocetus belongs to Aetiocetidae'
- 'Africanomys belongs to Ctenodactylidae'
- 'Afrocricetodon belongs to Cricetidae'
- 'Afrocricetodontinae belongs to Muridae'
- 'Afromeryx belongs to Anthracotheriidae'
- 'Afrotarsius belongs to Tarsiidae'
- 'Agabelus belongs to Autoceta'
- 'Ageitodendron belongs to Omomyidae'
- 'Agerinia belongs to Adapidae'
- 'Agispelagus belongs to Leporidae'
- 'Aglaocetus belongs to Cetotheriidae'
- 'Agnotocastor belongs to Castoridae'
- 'Agorophiidae belongs to Autoceta'
- 'Agorophius belongs to Agorophiidae'
- 'Agriocetus belongs to Squalodontidae'
- 'Agriochoeridae belongs to Oreodontoidea'
- 'Agriochoerus belongs to Agriochoeridae'
- 'Agriomeryx is a subjective synonym of Agriochoerus'
- 'Aivukus belongs to Odobenina'
- 'Akodon belongs to Cricetidae'
- 'Aksyiria belongs to Suiformes'
- 'Alachtherium belongs to Odobenina'
- 'Alactaga belongs to Dipodidae'
- 'Alagomyidae belongs to Protrogomorpha'
- 'Alagomys belongs to Alagomyidae'
- 'Albanensia belongs to Sciuridae'
- 'Albertatherium belongs to Didelphidae'
- 'Albireo belongs to Albireonidae'
- 'Albireonidae belongs to Delphinoidea'
- 'Alcidedorbignya belongs to Wangliidae'
- 'Alcidedorbignyidae is a subjective synonym of Wangliidae'
- 'Alienetherium belongs to Hyaenodontidae'
- 'Alilepus belongs to Leporidae'
- 'Aliveria belongs to Sciuridae'
- 'Allacodon belongs to Cimolomyidae'
- 'Allocavia belongs to Caviidae'
- 'Allocricetus belongs to Cricetidae'
- 'Allocyon belongs to Phocoidea'
- 'Allodelphis belongs to Platanistidae'
- 'Allodesmus belongs to Desmatophocini'
- 'Allomyidae belongs to Aplodontoidea'
- 'Allomys belongs to Allomyidae'
- 'Allophaiomys belongs to Cricetidae'
- 'Allopterodon belongs to Hyaenodontidae'
- 'Allospalax belongs to Cricetidae'
- 'Alostera belongs to Cimolesta'
- 'Alphadon belongs to Didelphidae'
- 'Altanius belongs to Omomyidae'
- 'Alticola belongs to Cricetidae'
- 'Aluralagus belongs to Leporidae'
- 'Alveojunctus belongs to Picromomyidae'
- 'Alwoodia belongs to Allomyidae'
- 'Amaramnis belongs to Pantolestidae'
- 'Amblotherium belongs to Dryolestidae'
- 'Amblycastor belongs to Eutypomyidae'
- 'Amblytatus belongs to Euphractini'
- 'Ambulocetus belongs to Pakicetinae'
- 'Amebelodon belongs to Amebelodontina'
- 'Amebelodontina belongs to Amebelodontini'
- 'Amebelodontini belongs to Gomphotheriinae'
- 'Ameniscomys belongs to Aplodontidae'
- 'Ammospermophilus belongs to Sciuridae'
- 'Amphibiae is a subjective synonym of Phocoidea'
- 'Amphicetus belongs to Cetotheriidae'
- 'Amphicynodon belongs to Phocoidea'
- 'Amphidolops belongs to Polydolopidae'
- 'Amphidon belongs to Amphidontidae'
- 'Amphidozotheriinae belongs to Nyctitheriidae'
- 'Amphiperatherium belongs to Herpetotheriinae'
- 'Amphipithecus belongs to Anthropoidea'
- 'Amphirhagatherium belongs to Haplobunodontidae'
- 'Amphitherium belongs to Amphitheriidae'
- 'Anacharsis belongs to Delphinidae'
- 'Anacodon belongs to Arctocyonidae'
- 'Anancus belongs to Elephantidae'
- 'Anantiosodon belongs to Peltephilidae'
- 'Anaptomorphus belongs to Omomyidae'
- 'Anasazia belongs to Palaechthonidae'
- 'Anasinopa belongs to Hyaenodontidae'
- 'Anatherium belongs to Borhyaenidae'
- 'Ancalecetus belongs to Dorudontinae'
- 'Anchimysops belongs to Hydrochoeridae'
- 'Anchistodelphys belongs to Marsupialia'
- 'Anchitheriomys belongs to Eutypomyidae'
- 'Anchomomys belongs to Adapidae'
- 'Anconodon belongs to Cimolodontidae'
- 'Andrewsarchus belongs to Triisodontidae'
- 'Andrewsimys belongs to Phiomyidae'
- 'Andrewsiphius belongs to Remingtonocetidae'
- 'Anemorhysis belongs to Omomyidae'
- 'Angelocabrerus belongs to Borhyaenidae'
- 'Anicanodonta is a subjective synonym of Pilosa'
- 'Anisodelphis is a subjective synonym of Ischyrorhynchus'
- 'Ankalagon belongs to Mesonychidae'
- 'Ankotarinja belongs to Dasyuridae'
- 'Anomalomys belongs to Cricetidae'
- 'Anomoemys belongs to Cylindrodontidae'
- 'Anonymus belongs to Ischyromyidae'
- 'Anoplonassa belongs to Hyperoodontidae'
- 'Anoplotheriadae is corrected as Anoplotheriidae and belongs to Anoplotherioidea'
- 'Anoplotheriinae belongs to Anoplotheriidae'
- 'Anoplotherioidea belongs to Suiformes'
- 'Anouroneomys belongs to Soricidae'
- 'Antarctodolops belongs to Polydolopidae'
- 'Antechinomys belongs to Dasyuridae'
- 'Antechinus belongs to Dasyuridae'
- 'Antemus belongs to Muridae'
- 'Anteutatus belongs to Eutatini'
- 'Anthracobune belongs to Anthracobunidae'
- 'Anthracobunidae belongs to Proboscidea'
- 'Anthracobunodon belongs to Haplobunodontidae'
- 'Anthracochoerus belongs to Anthracotheriidae'
- 'Anthracohyus belongs to Anthracotheriidae'
- 'Anthracokeryx belongs to Anthracotheriidae'
- 'Anthracomys belongs to Muridae'
- 'Anthracosenex belongs to Anthracotheriidae'
- 'Anthracothema belongs to Anthracotheriidae'
- 'Anthracotheriidae belongs to Anthracotherioidea'
- 'Anthracotherioidea belongs to Suiformes'
- 'Anthracotherium belongs to Anthracotheriidae'
- 'Antiacodon belongs to Homacodontini'
- 'Anutaetus belongs to Euphractini'
- 'Apatemyidae belongs to Apatotheria'
- 'Apatemys belongs to Apatemyidae'
- 'Apatosciuravus belongs to Ischyromyidae'
- 'Apatotheria was reranked as a suborder and belongs to Cimolesta'
- 'Apenophyseter is a subjective synonym of Idiorophus'
- 'Aphronorus belongs to Pantolestidae'
- 'Apidium belongs to Parapithecidae'
- 'Apletotomeus belongs to Protrogomorpha'
- 'Aplodontia belongs to Aplodontidae'
- 'Apodemus belongs to Muridae'
- 'Aporotus is a subjective synonym of Ziphirostrum'
- 'Apriculus belongs to Helohyidae'
- 'Apternodontidae belongs to Soricomorpha'
- 'Apternodus belongs to Apternodontidae'
- 'Apterodon belongs to Hyaenodontidae'
- 'Aquiladelphis belongs to Pediomyidae'
- 'Araeodelphis belongs to Autoceta'
- 'Araeodon belongs to Paurodontidae'
- 'Aralomys belongs to Cricetidae'
- 'Arapahovius belongs to Omomyidae'
- 'Aratomys belongs to Cricetidae'
- 'Archaenodon is corrected as Achaenodon and belongs to Helohyidae'
- 'Archaeobelodon belongs to Protanancina'
- 'Archaeoceti was reranked as a infraorder and belongs to Cetacea'
- 'Archaeocetus is a subjective synonym of Lissodelphis'
- 'Archaeocetus fockii major is recombined as Lissodelphis fockii major'
- 'Archaeocetus fockii minor is recombined as Lissodelphis fockii minor'
- 'Archaeodelphis belongs to Autoceta'
- 'Archaeoindris belongs to Palaeopropithecidae'
- 'Archaeolagus belongs to Leporidae'
- 'Archaeolemur belongs to Archaeolemuridae'
- 'Archaeolophus is a subjective synonym of Carolozittelia'
- 'Archaeotrigon belongs to Paurodontidae'
- 'Archaeutatus belongs to Eutatini'
- 'Arctias is a subjective synonym of Phoca'
- 'Arctocephalina was reranked as the subfamily Arctocephalinae and belongs to Otariidae'
- 'Arctocephalus belongs to Arctocephalinae'
- 'Arctocyon belongs to Arctocyonidae'
- 'Arctocyonia is a subjective synonym of Procreodi'
- 'Arctocyonides belongs to Arctocyonidae'
- 'Arctodontomys belongs to Microsyopidae'
- 'Arctomyoides belongs to Sciuridae'
- 'Arctophoca is a subjective synonym of Arctocephalus'
- 'Arctoryctes belongs to Proscalopidae'
- 'Ardynomys belongs to Cylindrodontidae'
- 'Arfia belongs to Hyaenodontidae'
- 'Arginbaatar belongs to Arginbaataridae'
- 'Arginbaataridae belongs to Plagiaulacoidea'
- 'Argyrocetus belongs to Rhabdosteidae'
- 'Argyrodelphis is a subjective synonym of Notocetus'
- 'Argyrohyrax is a subjective synonym of Plagiarthrus'
- 'Argyrohyus belongs to Tayassuinae'
- 'Argyrolagidae belongs to Paucituberculata'
- 'Argyrolagus belongs to Argyrolagidae'
- 'Argyrolestes belongs to Borhyaenidae'
- 'Argyromys belongs to Cricetidae'
- 'Arikareeomys belongs to Eomyidae'
- 'Arionius is a subjective synonym of Squalodon'
- 'Armantomys belongs to Gliridae'
- 'Arminiheringia belongs to Borhyaenidae'
- 'Armintodelphys belongs to Didelphidae'
- 'Armintomyidae belongs to Castorimorpha'
- 'Armintomys belongs to Armintomyidae'
- 'Arretotherium belongs to Anthracotheriidae'
- 'Artionyx is a subjective synonym of Agriochoerus'
- 'Artodictis belongs to Borhyaenidae'
- 'Arvicanthis belongs to Muridae'
- 'Arvicola belongs to Cricetidae'
- 'Arvicolidae was reranked as the subfamily Arvicolinae and belongs to Muridae'
- 'Arvicolini belongs to Arvicolinae'
- 'Asellia mariaetheresae belongs to Asellia' according to P. Mein 1958
- 'Asioryctes belongs to Kennalestidae'
- 'Asmodeus belongs to Homalodotheriidae'
- 'Aspidocalyptus belongs to Palaehoplophorini'
- 'Astegotherium belongs to Stegotheriini'
- 'Asteromys belongs to Eocardiidae'
- 'Asterostemma belongs to Propalaehoplophorinae'
- 'Astrapotheria belongs to Meridiungulata'
- 'Astrapotheriidae belongs to Astrapotheria'
- 'Astrapotheroidea is a subjective synonym of Astrapotheria'
- 'Asymmetrura belongs to Hoplophorinae'
- 'Atlantoxerus belongs to Sciuridae'
- 'Atocetus belongs to Kentriodontidae'
- 'Atopomys belongs to Cricetidae'
- 'Atopotarus is a subjective synonym of Allodesmus'
- 'Atopotherium belongs to Anthracotheriidae'
- 'Atropatenocetus belongs to Autoceta'
- 'Auliscomys belongs to Cricetidae'
- 'Aulocetus is an objective synonym of Cetotheriopsis'
- 'Aulolithomys belongs to Eomyidae'
- 'Aulophyseter belongs to Hoplocetinae'
- 'Aumelasia belongs to Dichobunini'
- 'Aureliachoerus belongs to Palaeochoerinae'
- 'Australithax belongs to Phocoenidae'
- 'Australophocaena belongs to Phocoenoidinae'
- 'Australopithecus belongs to Hominidae'
- 'Austrosqualodon belongs to Squalodontoidea'
- 'Austrotriconodontidae belongs to Triconodonta'
- 'Autoceta was reranked as a infraorder and belongs to Cetacea'
- 'Auxontodon belongs to Homacodontini'
- 'Avitotherium belongs to Cimolesta'
- 'Avunculus belongs to Cimolestidae'
- 'Aycrossia belongs to Omomyidae'
- 'Aztlanolagus belongs to Leporidae'
- 'Babiacetus belongs to Protocetidae'
- 'Babyrousa belongs to Babyrousini'
- 'Babyrousini belongs to Suinae'
- 'Baiomys belongs to Cricetidae'
- 'Baiotomeus belongs to Ptilodontidae'
- 'Bakalovia belongs to Anthracotheriidae'
- 'Balaenodon belongs to Physeterinae'
- 'Balaenoidea is a nomen dubium'
- 'Balaenoptera belongs to Balaenopterinae'
- 'Balaenopteridae belongs to Mysticeti'
- 'Balaenopterinae belongs to Balaenopteridae' according to Gray 1864
- 'Balaenopterinae belongs to Balaenopteridae'
- 'Balaenopteroidea is a nomen dubium'
- 'Balaenotus is a subjective synonym of Balaenula'
- 'Balaenula belongs to Balaenidae'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticeti'
- 'Baranomys belongs to Cricetidae'
- 'Barberahyus belongs to Doliochoerini'
- 'Barunlestes belongs to Zalambdalestidae'
- 'Barylambdidae belongs to Pantolambdoidea'
- 'Barytheriidae belongs to Proboscidea'
- 'Barytherium belongs to Barytheriidae'
- 'Basilosauridae belongs to Archaeoceti'
- 'Basilosaurinae belongs to Basilosauridae'
- 'Basilosaurus belongs to Basilosaurinae'
- 'Bathyergoides belongs to Bathyergidae'
- 'Bathygenys belongs to Oreonetinae'
- 'Batodon belongs to Geolabididae'
- 'Batodonoides belongs to Geolabididae'
- 'Behemota belongs to Tethytheria'
- 'Behemotops belongs to Desmostylidae'
- 'Belemnoziphius belongs to Hyperoodontidae'
- 'Beleutinus belongs to Trituberculata'
- 'Belonodelphis belongs to Kentriodontidae'
- 'Belosphys belongs to Autoceta'
- 'Beluginae is a subjective synonym of Delphinapterinae'
- 'Bematherium belongs to Diprotodontidae'
- 'Berardiopsis belongs to Hyperoodontidae'
- 'Berardius belongs to Hyperoodontidae'
- 'Berruvius belongs to Microsyopidae'
- 'Berthawyleria belongs to Hoplophorini'
- 'Bettongia belongs to Macropodidae'
- 'Bimanes is an invalid subgroup of Homo'
- 'Bisonalveus belongs to Pantolestidae'
- 'Bistius belongs to Didelphidae'
- 'Blackia belongs to Sciuridae'
- 'Blancomys belongs to Cricetidae'
- 'Boffiidae belongs to Ptilodontoidea'
- 'Boffius belongs to Boffiidae'
- 'Bolodon belongs to Paulchoffatiidae'
- 'Bolomys belongs to Cricetidae'
- 'Bomburia belongs to Mioclaenidae'
- 'Bonapartheriidae belongs to Marsupialia'
- 'Bonapartherium belongs to Bonapartheriidae'
- 'Boreodon belongs to Stagodontidae'
- 'Boreofiber belongs to Castoridae'
- 'Boreostracon is a subjective synonym of Glyptotherium'
- 'Borhyaenidae belongs to Didelphoidea'
- 'Borhyaenidium belongs to Borhyaenidae'
- 'Boryhyaena belongs to Borhyaenidae'
- 'Bothriodon belongs to Anthracotheriidae'
- 'Bothriogenys belongs to Anthracotheriidae'
- 'Brachalletes belongs to Diprotodontidae'
- 'Brachalletes belongs to Macropodidae'
- 'Brachianodon belongs to Metacheiromyidae'
- 'Brachydelphis belongs to Pontoporiidae'
- 'Brachylagus belongs to Leporidae'
- 'Brachymeryx is a subjective synonym of Cyclopidius'
- 'Brachyodus belongs to Anthracotheriidae'
- 'Brachyostracon is a subjective synonym of Glyptotherium'
- 'Brachyrhizomys belongs to Rhizomyidae'
- 'Brachytherium belongs to Proterotheriinae'
- 'Brancatherulum belongs to Peramuridae'
- 'Branisamys belongs to Rodentia'
- 'Branisella belongs to Cebidae'
- 'Bransatoglis belongs to Gliridae'
- 'Brasiliochoerus belongs to Tayassuinae'
- 'Bryceomys belongs to Multituberculata'
- 'Buginbaatar belongs to Eucosmodontidae'
- 'Bugtitherium belongs to Anthracotheriidae'
- 'Bulganbaatar belongs to Eucosmodontidae'
- 'Bunobrachyodus belongs to Anthracotheriidae'
- 'Bunolistriodon belongs to Listriodontinae'
- 'Bunomerycini belongs to Homacodontinae'
- 'Bunomeryx belongs to Bunomerycini'
- 'Bunophorus belongs to Diacodexinae'
- 'Burramyidae belongs to Phalangeroidea'
- 'Burramys belongs to Burramyidae'
- 'Burtinopsis belongs to Balaenopterinae'
- 'Butlerigale belongs to Eupantotheria'
- 'Buxobune belongs to Dichobunini'
- 'Cabassous belongs to Priodontini'
- 'Caenolestes belongs to Caenolestinae'
- 'Caenolestidae belongs to Caenolestoidea'
- 'Caenolestinae belongs to Caenolestidae'
- 'Caenolestoidea belongs to Marsupialia'
- 'Caenomeryx belongs to Cainotheriinae'
- 'Caenopithecus belongs to Adapidae'
- 'Caenotherium is an objective synonym of Cainotherium'
- 'Cainochoerus belongs to Suidae'
- 'Cainotheriidae belongs to Anoplotherioidea'
- 'Cainotheriinae belongs to Cainotheriidae'
- 'Cainotherium belongs to Cainotheriinae'
- 'Callocephalus is a subjective synonym of Phoca'
- 'Callophoca belongs to Monachina'
- 'Callorhinae is an invalid subgroup of Otariidae'
- 'Callorhinina is an invalid subgroup of Otariidae'
- 'Callorhinus is replaced by Callotaria' according to Palmer 1892
- 'Callorhinus belongs to Otariidae'
- 'Callorhynchus is a subjective synonym of Callorhinus'
- 'Calomyscus belongs to Cricetidae'
- 'Caloprymnus belongs to Macropodidae'
- 'Campestrallomys belongs to Allomyidae'
- 'Campylocynodon is a subjective synonym of Parictis'
- 'Cantius belongs to Adapidae'
- 'Capacikala belongs to Castoridae'
- 'Capatanka belongs to Castoridae'
- 'Caprolagus belongs to Leporidae'
- 'Cardiatheriinae belongs to Hydrochoeridae'
- 'Cardiatherium belongs to Hydrochoeridae'
- 'Cardiodon is a subjective synonym of Anchimys'
- 'Cardiomyinae belongs to Caviidae'
- 'Cardiomys belongs to Caviidae'
- 'Carlesia is a subjective synonym of Eumegamys'
- 'Carnivorae is a subjective synonym of Cetacea'
- 'Carodnia belongs to Carodniidae'
- 'Carodniidae belongs to Xenungulata'
- 'Carolozittelia belongs to Pyrotheriidae'
- 'Carolozittelidae is a subjective synonym of Pyrotheriidae'
- 'Carpocristes belongs to Carpolestidae'
- 'Carpodaptes belongs to Carpolestidae'
- 'Carpolestes belongs to Carpolestidae'
- 'Caspiopusa is a subjective synonym of Phoca'
- 'Castellanosia belongs to Doedicurinae'
- 'Castillomys belongs to Muridae'
- 'Castor belongs to Castoridae'
- 'Castoroidea belongs to Castorimorpha'
- 'Castoroides belongs to Castoridae'
- 'Catagonus belongs to Tayassuinae'
- 'Catodontherium belongs to Dacrytheriidae'
- 'Catodontidae is a subjective synonym of Physeteridae'
- 'Catodus is replaced by Catodontherium'
- 'Catopsalis belongs to Taeniolabididae'
- 'Caudaphorus belongs to Hoplophorinae'
- 'Cavia belongs to Caviidae'
- 'Caviodon belongs to Caviidae'
- 'Caviops belongs to Caviidae'
- 'Cebochoeridae belongs to Dichobunoidea'
- 'Cebochoerus belongs to Cebochoeridae'
- 'Cebupithecia belongs to Atelidae'
- 'Ceciliolemur is a subjective synonym of Amphiperatherium'
- 'Cedromus belongs to Sciuridae'
- 'Celebochoerus belongs to Potamochoerini'
- 'Centetodon belongs to Geolabididae'
- 'Centimanomys belongs to Eomyidae'
- 'Cephalomys belongs to Dasyproctidae'
- 'Cephalorhynchinae belongs to Delphinidae'
- 'Cephalorhynchus belongs to Cephalorhynchinae'
- 'Cephalotropis belongs to Cetotheriidae'
- 'Cercaertus belongs to Phalangeridae'
- 'Cercartetus belongs to Burramyidae'
- 'Cercocebus belongs to Cercopithecidae'
- 'Cercomys belongs to Echimyidae'
- 'Cercopithecoides belongs to Cercopithecidae'
- 'Cervinae belongs to Cervidae'
- 'Cervini belongs to Cervinae'
- 'Cetacea was reranked as a suborder and belongs to Cete'
- 'Ceterhinops belongs to Autoceta'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Mysticeti'
- 'Cetotheriomorphus is a nomen oblitum'
- 'Cetotheriomorphus dubius belongs to Cetotheriomorphus' according to J. F. Brandt 1873
- 'Cetotheriopsis belongs to Cetotheriidae'
- 'Cetotherium belongs to Cetotheriidae'
- 'Cetotheriophanes is a subjective synonym of Balaenoptera'
- 'Cetotherium (Eucetotherium) was reranked as Eucetotherium and belongs to Cetotheriidae'
- 'Plesiocetopsis is a subjective synonym of Plesiocetus'
- 'Ceutholestes belongs to Nyctitheriidae'
- 'Chadrolagus belongs to Leporidae'
- 'Chadronia belongs to Pantolestidae'
- 'Chaenohyus belongs to Tayassuinae'
- 'Chaeomysticeti is a nomen dubium'
- 'Chaeromeryx is a subjective synonym of Choeromeryx'
- 'Chaeropotamus is corrected as Choeropotamus and belongs to Choeropotamidae'
- 'Chaeropus belongs to Peramelidae'
- 'Chaetophractus belongs to Euphractini'
- 'Chalicomomys belongs to Micromomyidae'
- 'Chalicomys belongs to Castoridae'
- 'Champsodelphidae is a subjective synonym of Acrodelphinidae'
- 'Champsodelphis belongs to Acrodelphinidae'
- 'Chapalmatherium belongs to Hydrochoeridae'
- 'Chapattimys belongs to Chapattimyidae'
- 'Chasichimys belongs to Echimyidae'
- 'Chasicomys belongs to Octodontidae'
- 'Chasicostylus belongs to Borhyaenidae'
- 'Chasicotatus belongs to Eutatini'
- 'Cheiromydae is a subjective synonym of Daubentoniidae'
- 'Chipetaia belongs to Omomyidae'
- 'Chiromyoides belongs to Plesiadapidae'
- 'Chlamydotherium belongs to Glyptodontinae'
- 'Chlamydotherium belongs to Glyptodontini'
- 'Chlamyphorini belongs to Euphractinae'
- 'Chlamyphorus belongs to Chlamyphorini'
- 'Chlamyphractus belongs to Palaehoplophorini'
- 'Chlororhysis belongs to Omomyidae'
- 'Choeroclaenus belongs to Mioclaenidae'
- 'Choerolophodon belongs to Choerolophodontinae'
- 'Choerolophodontinae belongs to Elephantoidea'
- 'Choeromeryx belongs to Anthracotheriidae'
- 'Choeropotamidae belongs to Suiformes'
- 'Chonecetus belongs to Cetacea'
- 'Choneziphius belongs to Hyperoodontidae'
- 'Chorlakkia belongs to Dichobunidae'
- 'Chorobates belongs to Euphractini'
- 'Chorobates scalabrinii is recombined as Acantharodeia scalabrinii'
- 'Chorotherium is an objective synonym of Protoreodon'
- 'Chriacus belongs to Arctocyonidae'
- 'Chubutomys belongs to Eocardiidae'
- 'Chulsanbaatar belongs to Chulsanbaataridae'
- 'Chulsanbaataridae belongs to Taeniolabidoidea'
- 'Chumashius belongs to Omomyidae'
- 'Cimarronomys belongs to Cricetidae'
- 'Cimexomys belongs to Multituberculata'
- 'Cimolesta belongs to Ferae'
- 'Cimolestes belongs to Cimolestidae'
- 'Cimolestidae belongs to Didelphodonta'
- 'Cimolodon belongs to Cimolodontidae'
- 'Cimolodontidae belongs to Ptilodontoidea'
- 'Cimolomyidae belongs to Multituberculata'
- 'Cimolomys belongs to Cimolomyidae'
- 'Cingulata was reranked as a order and belongs to Xenarthra'
- 'Cladosictis belongs to Borhyaenidae'
- 'Clemensodon belongs to Multituberculata'
- 'Clethrionomys belongs to Cricetidae'
- 'Cleuastochoerus belongs to Hyotheriinae'
- 'Clinodon belongs to Micropternodontidae'
- 'Clinopternodus belongs to Micropternodontidae'
- 'Clypeotherium belongs to Glyptatelinae'
- 'Cocomys belongs to Cocomyidae'
- 'Coelutaetus belongs to Euphractinae'
- 'Coendou belongs to Erethizontidae'
- 'Colobus belongs to Cercopithecidae'
- 'Colombitheriidae is a subjective synonym of Pyrotheriidae'
- 'Colombitherium belongs to Pyrotheriidae'
- 'Colophonodon belongs to Squalodontidae'
- 'Coloradoeumys belongs to Cricetidae'
- 'Coloreodon is a subjective synonym of Agriochoerus'
- 'Colpoclaenus belongs to Arctocyonidae'
- 'Colpodon belongs to Notohippidae'
- 'Colpostemma belongs to Dinomyidae'
- 'Columbomys belongs to Theridomyidae'
- 'Comanchea belongs to Picopsidae'
- 'Comancheomys belongs to Eomyidae'
- 'Comaphorus belongs to Doedicurinae'
- 'Conohyus belongs to Tetraconodontinae'
- 'Consobrinus belongs to Hyaenodontidae'
- 'Coona belongs to Didelphinae'
- 'Copedelphys belongs to Didelphidae'
- 'Copelemur belongs to Adapidae'
- 'Copemys belongs to Cricetidae'
- 'Cophocetus belongs to Cetotheriidae'
- 'Coriphagus belongs to Pantolestidae'
- 'Cornwallius belongs to Desmostylidae'
- 'Coryphodontidae belongs to Coryphodontoidea'
- 'Coryphodontoidea belongs to Pantodonta'
- 'Coscinocercus belongs to Plohophorini'
- 'Cotimus belongs to Cricetidae'
- 'Craseops belongs to Microsyopidae'
- 'Cratogeomys belongs to Geomyidae'
- 'Crenaticeti is a nomen dubium'
- 'Creotarsinae was reranked as the family Creotarsidae and belongs to Erinaceomorpha'
- 'Creotarsus belongs to Creotarsidae'
- 'Cricetidae belongs to Muroidea'
- 'Cricetinus belongs to Cricetidae'
- 'Cricetodon belongs to Cricetidae'
- 'Cricetodontinae belongs to Muridae'
- 'Cricetopidae was reranked as the subfamily Cricetopinae and belongs to Muridae'
- 'Cricetops belongs to Cricetopinae'
- 'Cricetulus belongs to Cricetidae'
- 'Cricetus belongs to Cricetidae'
- 'Crinotherium is a subjective synonym of Cainotherium'
- 'Croizetoceros belongs to Cervini'
- 'Crucimys belongs to Mylagaulidae'
- 'Crusafontia belongs to Dryolestidae'
- 'Cryptomys belongs to Bathyergidae'
- 'Cryptophoca belongs to Phocini'
- 'Cryptopterus belongs to Sciuridae'
- 'Cryptoryctes belongs to Micropternodontidae'
- 'Cseria is a subjective synonym of Mimomys'
- 'Ctalecarodnia is a subjective synonym of Carodnia'
- 'Ctemys belongs to Ctenomyidae'
- 'Ctenacodon belongs to Plagiaulacidae'
- 'Cuisitherium belongs to Dacrytheriidae'
- 'Cupidinimus belongs to Heteromyidae'
- 'Cupressimus belongs to Eomyidae'
- 'Cuvieroniini belongs to Rhynchotheriinae'
- 'Cuvieronius belongs to Cuvieroniini'
- 'Cuyamalagus belongs to Ochotonidae'
- 'Cyclomylus belongs to Cylindrodontidae'
- 'Cyclopidius belongs to Leptaucheniini'
- 'Chelonocephalus is a subjective synonym of Cyclopidius'
- 'Cylindrodon belongs to Cylindrodontidae'
- 'Cymaprimadon belongs to Pantolestidae'
- 'Cynodon is a subjective synonym of Amphicynodon'
- 'Cynohyaenodon belongs to Hyaenodontidae'
- 'Cynomys belongs to Sciuridae'
- 'Cynorca belongs to Tayassuinae'
- 'Cynorcidae is a subjective synonym of Tayassuidae'
- 'Cyriacotheriidae belongs to Pantolambdoidea'
- 'Cyrtodelphis is a subjective synonym of Schizodelphis'
- 'Cystophoca is a subjective synonym of Cystophora'
- 'Cystophora belongs to Phocini'
- 'Dabbenea belongs to Dinomyidae'
- 'Dacrytheriidae belongs to Anoplotherioidea'
- 'Dacrytherium belongs to Dacrytheriidae'
- 'Daedicuroides belongs to Doedicurinae'
- 'Dakkamys belongs to Myocricetodontinae' according to J. J. Jaeger 1977
- 'Dakkamys belongs to Myocricetodontini'
- 'Dakotadens belongs to Trituberculata'
- 'Dakotamys belongs to Multituberculata'
- 'Dalanistes belongs to Remingtonocetidae'
- 'Dalpiazina belongs to Dalpiazinidae'
- 'Dalpiazinidae belongs to Delphinoidea'
- 'Dankomys belongs to Cricetidae'
- 'Dasipidae was reranked as the unranked clade Dasypodidae and belongs to Dasypodoidea'
- 'Dasycercus belongs to Dasyuridae'
- 'Dasylurinja belongs to Dasyuridae'
- 'Dasymys belongs to Muridae'
- 'Dasypodina is corrected as Dasypodini and belongs to Dasypodinae'
- 'Dasypodinae belongs to Dasypodidae'
- 'Dasypodoidea belongs to Cingulata'
- 'Dasypodon belongs to Dasypodini'
- 'Dasypotherium is a subjective synonym of Macroeuphractus'
- 'Dasypus belongs to Dasypodini'
- 'Dasyuridae belongs to Dasyuroidea'
- 'Dasyuroidea belongs to Marsupialia'
- 'Dasyuroides belongs to Dasyuridae'
- 'Dawsonomys belongs to Cylindrodontidae'
- 'Deilotherium belongs to Anoplotheriinae'
- 'Deinotheriidae belongs to Proboscidea'
- 'Deinotherium belongs to Deinotheriidae'
- 'Delahomeryx belongs to Aepycamelinae'
- 'Delphinapteridae is a subjective synonym of Delphinapterinae'
- 'Delphinapterinae belongs to Monodontidae'
- 'Delphinapterus belongs to Delphinapterinae'
- 'Delphinapterus (Hemisyntrachelus) was reranked as Hemisyntrachelus and belongs to Hemisyntrachelidae'
- 'Pachypleurus is a subjective synonym of Lissodelphis'
- 'Delphinapterus (Pachypleurus) fockii is recombined as Lissodelphis fockii'
- 'Delphinapterus (Pachypleurus) nordmanni is recombined as Lissodelphis nordmanni'
- 'Delphinavus belongs to Autoceta'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphinina is an invalid subgroup of Delphininae'
- 'Delphininae belongs to Delphinidae'
- 'Delphinodon belongs to Kentriodontinae'
- 'Delphinoidea belongs to Odontoceti'
- 'Delphinopsis belongs to Autoceta'
- 'Delphinus belongs to Delphininae'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Globicephalinae'
- 'Delphodon belongs to Stagodontidae'
- 'Deltatheridiidae belongs to Trituberculata'
- 'Deltatheridium belongs to Deltatheridiidae'
- 'Deltatheroides belongs to Deltatheridiidae'
- 'Democricetodon belongs to Cricetidae'
- 'Democricetodon (Megacricetodon) was reranked as Megacricetodon and belongs to Cricetidae'
- 'Dendrolagus belongs to Macropodidae'
- 'Dendromus belongs to Muridae'
- 'Dendropithecus belongs to Pliopithecidae'
- 'Denebola belongs to Delphinapterinae'
- 'Dermoptera belongs to Eutheria'
- 'Deseadomys belongs to Echimyidae'
- 'Desmatoclaenus belongs to Arctocyonidae'
- 'Desmatolagus belongs to Ochotonidae'
- 'Desmatophoca belongs to Desmatophocini'
- 'Desmatophocinae was reranked as the tribe Desmatophocini and belongs to Odobeninae'
- 'Desmodillus belongs to Cricetidae'
- 'Desmostylia was reranked as a unranked clade and belongs to Behemota'
- 'Desmostylidae belongs to Desmostylia'
- 'Desmostylus belongs to Desmostylidae'
- 'Deuterogonodon belongs to Arctocyonidae'
- 'Diacodexinae belongs to Dichobunidae'
- 'Diacodexis belongs to Diacodexinae'
- 'Diamantohyus belongs to Sanitheriidae'
- 'Diamantomys belongs to Diamantomyidae'
- 'Diaphorocetus belongs to Hoplocetinae'
- 'Diaphoromys belongs to Dinomyidae'
- 'Diaphyodectes belongs to Leptictidae'
- 'Diatomys belongs to Theridomyidae'
- 'Dichobune belongs to Dichobunini'
- 'Dichobunidae belongs to Dichobunoidea'
- 'Dichobuninae belongs to Dichobunidae'
- 'Dichobunini belongs to Dichobuninae'
- 'Dichobunoidea belongs to Suiformes'
- 'Dicoryphochoerus is a subjective synonym of Hippopotamodon'
- 'Dicotylidae is a subjective synonym of Tayassuidae'
- 'Dicrostonyx belongs to Cricetidae'
- 'Didelpha is a subjective synonym of Marsupialia'
- 'Didelphia belongs to Marsupialia'
- 'Didelphidae belongs to Didelphoidea'
- 'Didelphidectes belongs to Didelphidae'
- 'Didelphina is a subjective synonym of Didelphinae'
- 'Didelphys is a subjective synonym of Didelphis'
- 'Didelphis belongs to Didelphidae'
- 'Didelphodon belongs to Stagodontidae'
- 'Didelphodonta was reranked as a suborder and belongs to Cimolesta'
- 'Didelphodus belongs to Cimolestidae'
- 'Didelphoidea belongs to Marsupialia'
- 'Dillerlemur belongs to Paromomyidae'
- 'Dinomys belongs to Dinomyidae'
- 'Dinopithecus belongs to Cercopithecidae'
- 'Diochotichus is a subjective synonym of Notocetus'
- 'Dioplodon becanii belongs to Dioplodon' according to P. J. Van Beneden 1860
- 'Diorocetus belongs to Cetotheriidae'
- 'Dipassalus belongs to Epoicotheriidae'
- 'Diplobune belongs to Anoplotheriinae'
- 'Diplobunops belongs to Agriochoeridae'
- 'Diplopus belongs to Anthracotheriidae'
- 'Dipodomys belongs to Heteromyidae'
- 'Dipoides belongs to Castoridae'
- 'Diprionomys belongs to Heteromyidae'
- 'Diprotodon belongs to Diprotodontidae'
- 'Diprotodonta belongs to Marsupialia'
- 'Diprotodontidae belongs to Vombatoidea'
- 'Dipus belongs to Dipodidae'
- 'Dissacus belongs to Mesonychidae'
- 'Dissacusium belongs to Mesonychidae'
- 'Dissopsalis belongs to Hyaenodontidae'
- 'Disteiromys belongs to Erethizontidae'
- 'Doedicuridae was reranked as the subfamily Doedicurinae and belongs to Glyptodontidae'
- 'Doellotatus belongs to Eutatini'
- 'Dolicavia belongs to Caviidae'
- 'Dolichocebus belongs to Cebidae'
- 'Dolichopithecus belongs to Cercopithecidae'
- 'Dolichotis belongs to Caviidae'
- 'Doliochoerinae belongs to Tayassuidae'
- 'Doliochoerini belongs to Doliochoerinae'
- 'Doliochoerus belongs to Doliochoerini'
- 'Doliodelphis is a subjective synonym of Argyrocetus'
- 'Dolomys belongs to Cricetidae'
- 'Donrussellia belongs to Omomyidae'
- 'Dorcopsis belongs to Macropodidae'
- 'Dorcopsoides belongs to Macropodidae'
- 'Dorudon belongs to Dorudontinae'
- 'Dorudontidae belongs to Basilosauridae'
- 'Downsimus belongs to Allomyidae'
- 'Draconodus belongs to Picrodontidae'
- 'Dracontolestes belongs to Mixodectidae'
- 'Drassonax belongs to Phocoidea'
- 'Dromocyon is a subjective synonym of Dissacus'
- 'Dryolestes belongs to Dryolestidae'
- 'Dryomimus belongs to Gliridae'
- 'Dryomys belongs to Gliridae'
- 'Dryopithecus belongs to Pongidae'
- 'Dubiomys belongs to Ctenodactylidae'
- 'Dubiotherium belongs to Hyotheriinae'
- 'Dulcidon belongs to Dichobunidae'
- 'Duplicidentata was reranked as a suborder and belongs to Anagalida'
- 'Dusignathinae was reranked as the subtribe Dusignathina and belongs to Odobenini'
- 'Dusignathus belongs to Dusignathina'
- 'Dyseohyus belongs to Tayassuinae'
- 'Dyseolemur belongs to Omomyidae'
- 'Eboroziphius belongs to Hyperoodontidae'
- 'Ecclesimus belongs to Florentiamyidae'
- 'Echidnidae is a subjective synonym of Tachyglossidae'
- 'Echymipera belongs to Peramelidae'
- 'Ectropomys belongs to Rodentia'
- 'Ectypodus belongs to Ptilodontidae'
- 'Edentata is a subjective synonym of Xenarthra'
- 'Egatochoerus belongs to Tayassuinae'
- 'Ekgmowechashala belongs to Plagiomenidae'
- 'Ektopodon belongs to Ektopodontidae'
- 'Ektopodontidae belongs to Phalangeroidea'
- 'Elephantidae belongs to Elephantoidea'
- 'Elephantina was reranked as a subtribe and belongs to Elephantini'
- 'Elephantinae belongs to Elephantidae'
- 'Elephantini belongs to Elephantinae'
- 'Elephantoidea belongs to Proboscidea'
- 'Elephantulus belongs to Macroscelididae'
- 'Elephas belongs to Elephantina'
- 'Eleutherocercus belongs to Doedicurinae'
- 'Elfomys belongs to Theridomyidae'
- 'Eliomys belongs to Gliridae'
- 'Ellesmene belongs to Plagiomenidae'
- 'Ellipsodon belongs to Mioclaenidae'
- 'Ellobius belongs to Cricetidae'
- 'Elmerimys belongs to Myophiomyidae'
- 'Elomeryx belongs to Anthracotheriidae'
- 'Elphidotarsius belongs to Carpolestidae'
- 'Elpidophorus belongs to Plagiomenidae'
- 'Elwynella belongs to Paromomyidae'
- 'Elymys belongs to Zapodidae'
- 'Enaliarctos belongs to Phocoidea'
- 'Encinepeltus [misspelled as Eucinepeltus] belongs to Propalaehoplophorinae'
- 'Entomacodon belongs to Didelphidae'
- 'Entoptychus belongs to Geomyidae'
- 'Eobrasilia belongs to Borhyaenidae'
- 'Eobrasilia belongs to Marsupialia'
- 'Eocardia belongs to Eocardiidae'
- 'Eocetus belongs to Protocetidae'
- 'Eochiromys belongs to Apatemyidae'
- 'Eoconodon belongs to Triisodontidae'
- 'Eoctodon belongs to Octodontidae'
- 'Eodasypus belongs to Euphractini'
- 'Eodelphis belongs to Stagodontidae'
- 'Eoeumys belongs to Cricetidae'
- 'Eohaplomys belongs to Ischyromyidae'
- 'Eolagurus belongs to Cricetidae'
- 'Eolestes belongs to Erinaceomorpha'
- 'Eomannodon belongs to Caenolestidae'
- 'Eomeryx is a subjective synonym of Protoreodon'
- 'Eomuscardinus belongs to Gliridae'
- 'Eomyops belongs to Eomyidae'
- 'Eomys belongs to Eomyidae'
- 'Eoplatanista belongs to Acrodelphinidae'
- 'Eoplatanistidae is a subjective synonym of Acrodelphinidae'
- 'Eoryctes belongs to Palaeoryctidae'
- 'Eosclerocalyptus belongs to Hoplophorini'
- 'Eosclerophorus belongs to Hoplophorini'
- 'Eosqualodon belongs to Squalodontidae'
- 'Eosteiromys belongs to Erethizontidae'
- 'Eothenomys belongs to Cricetidae'
- 'Eozapus belongs to Zapodidae'
- 'Eozygodon belongs to Eozygodontinae'
- 'Eozygodontinae belongs to Mammutidae'
- 'Epeiromys belongs to Protrogomorpha'
- 'Ephelcomenus belongs to Anoplotheriinae'
- 'Epiblema is a subjective synonym of Neoepiblema'
- 'Epidolops belongs to Polydolopidae'
- 'Epimeriones belongs to Cricetidae'
- 'Epipeltephilus belongs to Peltephilidae'
- 'Epiphiomys belongs to Thryonomyidae'
- 'Erethizon belongs to Erethizontidae'
- 'Erignathus belongs to Phocini'
- 'Erinaceinae belongs to Erinaceidae'
- 'Erinaceini belongs to Erinaceinae'
- 'Ernanodonta was reranked as a suborder and belongs to Cimolesta'
- 'Ernanodontidae belongs to Ernanodonta'
- 'Eschatiidae is a subjective synonym of Camelidae'
- 'Eschrichtiinae belongs to Balaenopteridae'
- 'Eschrichtioidea is a nomen dubium'
- 'Essonodon belongs to Eucosmodontidae'
- 'Estellomys belongs to Theridomyidae'
- 'Esteslestes belongs to Didelphidae'
- 'Etayoa belongs to Carodniidae'
- 'Eubelodon belongs to Rhynchotheriinae'
- 'Eucastor belongs to Castoridae'
- 'Eucelophorus is a subjective synonym of Eucoelophorus'
- 'Eucetites is a nomen nudum'
- 'Eucetites juliensis belongs to Eucetites' according to Ameghino 1901
- 'Eucoelophorus belongs to Octodontidae'
- 'Eucosmodon belongs to Eucosmodontidae'
- 'Eucosmodontidae belongs to Taeniolabidoidea'
- 'Eucrotaphus belongs to Oreodontoidea'
- 'Eudaemonema belongs to Plagiomenidae'
- 'Eudolops belongs to Polydolopidae'
- 'Euhapsis belongs to Castoridae'
- 'Eumaiochoerus belongs to Suini'
- 'Eumegamyinae belongs to Dinomyidae'
- 'Eumetopias belongs to Otariinae'
- 'Eumyarion belongs to Cricetidae'
- 'Eumys belongs to Cricetidae'
- 'Eumysodon belongs to Cricetidae'
- 'Eumysops belongs to Echimyidae'
- 'Euowenia belongs to Diprotodontidae'
- 'Euphractinae belongs to Dasypodidae'
- 'Euphractini belongs to Euphractinae'
- 'Euphractus belongs to Euphractini'
- 'Eurhinodelphis belongs to Rhabdosteidae'
- 'Eurolistriodon is a subjective synonym of Bunolistriodon'
- 'Europolemur belongs to Adapidae'
- 'Euroxenomys belongs to Castoridae'
- 'Euryzygoma belongs to Diprotodontidae'
- 'Eusigmomys belongs to Dinomyidae'
- 'Eutamias belongs to Sciuridae'
- 'Eutatini belongs to Euphractinae'
- 'Eutatus belongs to Eutatini'
- 'Eutemnodus [misspelled as Eutemodus] belongs to Borhyaenidae'
- 'Euthlastus belongs to Dryolestidae'
- 'Eutypomys belongs to Eutypomyidae'
- 'Eygalayodon belongs to Homacodontini'
- 'Fahlbuschia belongs to Cricetidae'
- 'Falepetrus belongs to Trituberculata'
- 'Fanimus belongs to Florentiamyidae'
- 'Ferae is a subjective synonym of Marsupialia'
- 'Ferecetotherium belongs to Cetacea'
- 'Ferugliotheriidae belongs to Gondwanatheria'
- 'Florentiamys belongs to Florentiamyidae'
- 'Floresomys belongs to Protrogomorpha'
- 'Forsythia belongs to Sciuridae'
- 'Fossorcastor belongs to Castoridae'
- 'Francotherium belongs to Hyaenodontidae'
- 'Franimys belongs to Ischyromyidae'
- 'Gallolestes belongs to Leptictida'
- 'Galushamys belongs to Cricetidae'
- 'Gandakasia belongs to Pakicetinae'
- 'Gargantuodon is a subjective synonym of Orycterocetus'
- 'Gashternia belongs to Marsupialia'
- 'Gaudeamus belongs to Phiomyidae'
- 'Gaviacetus belongs to Protocetidae'
- 'Gazinius belongs to Omomyidae'
- 'Gelasmodon is a subjective synonym of Hemimeryx'
- 'Gelastops belongs to Cimolestidae'
- 'Geolabididae belongs to Soricomorpha'
- 'Geomyoidea belongs to Castorimorpha'
- 'Geomys belongs to Geomyidae'
- 'Gerbillus belongs to Cricetidae'
- 'Gerbua belongs to Muridae'
- 'Geringia belongs to Cricetidae'
- 'Germanomys belongs to Cricetidae'
- 'Getuloxerus belongs to Sciuridae'
- 'Gigantopithecus belongs to Pongidae'
- 'Glasbiidae belongs to Didelphoidea'
- 'Glasbius belongs to Glasbiidae'
- 'Glaucodon belongs to Dasyuridae'
- 'Glaucomys belongs to Sciuridae'
- 'Glibemys belongs to Zegdoumyidae'
- 'Glibia belongs to Zegdoumyidae'
- 'Gliravinae belongs to Myoxidae'
- 'Gliravus belongs to Gliridae'
- 'Glirudinus belongs to Gliridae'
- 'Glirulus belongs to Gliridae'
- 'Glis belongs to Gliridae'
- 'Globicephala belongs to Globicephalinae'
- 'Globiocephalidae was reranked as the subfamily Globicephalinae and belongs to Delphinidae'
- 'Globiocephalina is a subjective synonym of Globicephalinae'
- 'Glossotheridium is a subjective synonym of Glossotherium'
- 'Glyptatelinae belongs to Glyptodontidae'
- 'Glyptatelus belongs to Glyptatelinae'
- 'Glyptocoileus is a subjective synonym of Glyptodon'
- 'Glyptodon belongs to Glyptodontini'
- 'Glyptodontia is a subjective synonym of Cingulata'
- 'Glyptodontidae belongs to Glyptodontoidea'
- 'Glyptodontidium belongs to Glyptodontini'
- 'Glyptodontinae belongs to Glyptodontidae'
- 'Glyptodontoidea belongs to Cingulata'
- 'Glyptopedius is a subjective synonym of Glyptodon'
- 'Glyptostracon belongs to Glyptodontini'
- 'Glyptotheriini belongs to Glyptodontinae'
- 'Glyptotherium belongs to Glyptotheriini'
- 'Gnathabelodon belongs to Gomphotheriidae'
- 'Gnomomys is a subjective synonym of Copemys'
- 'Gobiohyus belongs to Helohyidae'
- 'Gobiolagus belongs to Lagomorpha'
- 'Gomphotaria belongs to Dusignathina'
- 'Gomphotheriidae belongs to Elephantoidea'
- 'Gomphotheriinae belongs to Gomphotheriidae'
- 'Gomphotheriini belongs to Gomphotheriinae'
- 'Gomphotherium belongs to Gomphotheriini'
- 'Goniacodon belongs to Triisodontidae'
- 'Goniodelphis belongs to Iniidae'
- 'Goniodontomys belongs to Cricetidae'
- 'Gonotelma belongs to Anthracotheriidae'
- 'Gorgopithecus belongs to Cercopithecidae'
- 'Grammomys belongs to Muridae'
- 'Graomys belongs to Cricetidae'
- 'Graphiodon belongs to Autoceta'
- 'Graphiurops belongs to Gliridae'
- 'Gravigrada is a subjective synonym of Phyllophaga'
- 'Gregorymys belongs to Geomyidae'
- 'Griphodon belongs to Pyrotheriidae'
- 'Gripholagomys belongs to Leporidae'
- 'Griphomys belongs to Protrogomorpha'
- 'Groeberia belongs to Groeberiidae'
- 'Groeberiidae belongs to Paucituberculata'
- 'Groebertherium belongs to Dryolestidae'
- 'Gryphoca belongs to Phocini'
- 'Guanajuatomys belongs to Sciuravidae'
- 'Guildayomys belongs to Cricetidae'
- 'Guilestes belongs to Mesonychidae'
- 'Guimarota belongs to Eupantotheria'
- 'Guimarotodon belongs to Paulchoffatiidae'
- 'Gumardee belongs to Macropodidae'
- 'Gymnobelideus belongs to Petauridae'
- 'Gypsonictopidae belongs to Leptictida'
- 'Gypsonictops belongs to Gypsonictopidae'
- 'Gypsophoca is a subjective synonym of Arctocephalus'
- 'Gypsorhynchus belongs to Bathyergidae'
- 'Gyriabrus belongs to Dinomyidae'
- 'Hadrodelphis belongs to Autoceta'
- 'Hadrohyus belongs to Oreodontoidea'
- 'Hadroleptauchenia belongs to Leptaucheniini'
- 'Hadronomas belongs to Macropodidae'
- 'Hadropithecus belongs to Archaeolemuridae'
- 'Halicetus belongs to Cetotheriidae'
- 'Halichoerus belongs to Phocini'
- 'Halicoridae is a subjective synonym of Dugongidae'
- 'Halicyon is a subjective synonym of Phoca'
- 'Haliphilus is a subjective synonym of Phoca'
- 'Hallebune belongs to Haplobunodontidae'
- 'Halmarhiphus belongs to Caenolestidae'
- 'Hapalidae is a subjective synonym of Callitrichidae'
- 'Hapalodectes belongs to Hapalodectidae'
- 'Hapalodectidae belongs to Acreodi'
- 'Hapalorestes belongs to Hapalodectidae'
- 'Haplobunodon belongs to Haplobunodontidae'
- 'Haplobunodontidae belongs to Anthracotherioidea'
- 'Haplodontidae is a subjective synonym of Aplodontidae'
- 'Haplomastodon belongs to Cuvieroniini'
- 'Haplomys belongs to Allomyidae'
- 'Haqueina belongs to Raoellidae'
- 'Haramiya belongs to Haramiyidae'
- 'Haramiyidae belongs to Haramiyoidea'
- 'Haramiyoidea belongs to Multituberculata'
- 'Harpagolestes belongs to Mesonychidae'
- 'Harpyodidae belongs to Pantodonta'
- 'Heliscomys belongs to Protrogomorpha'
- 'Helohyidae belongs to Dichobunoidea'
- 'Helvicetus belongs to Physeteridae'
- 'Hemiacodon belongs to Omomyidae'
- 'Hemicaulodon is a subjective synonym of Odobenus'
- 'Hemichoerus belongs to Suidae'
- 'Hemiechinus belongs to Erinaceini'
- 'Hemimastodon belongs to Hemimastodontidae'
- 'Hemimastodontidae belongs to Proboscidea'
- 'Hemimeryx belongs to Anthracotheriidae'
- 'Hemipsalodon belongs to Hyaenodontidae'
- 'Hemisyntrachelidae belongs to Delphinoidea'
- 'Hemiutaetus belongs to Euphractini'
- 'Henkelodon belongs to Paulchoffatiidae'
- 'Heosminthus verus belongs to Heosminthus' according to Wang 1985
- 'Heothema belongs to Anthracotheriidae'
- 'Heptacodon belongs to Anthracotheriidae'
- 'Herpetarius belongs to Dryolestidae'
- 'Herpetocetus belongs to Cetotheriidae'
- 'Herpetotheriidae is corrected as Herpetotheriinae and belongs to Didelphidae'
- 'Herpetotherium belongs to Didelphidae'
- 'Hesperhys belongs to Tayassuinae'
- 'Hesperocetus belongs to Autoceta'
- 'Hesperoinia belongs to Delphinoidea'
- 'Hesperolagomys belongs to Ochotonidae'
- 'Hesperolemur belongs to Adapidae'
- 'Hessolestes belongs to Mesonychidae'
- 'Heterocephalus belongs to Bathyergidae'
- 'Heterocetus belongs to Cetotheriidae'
- 'Heterodelphis belongs to Autoceta'
- 'Heterogeomys belongs to Geomyidae'
- 'Heteroglyptodon belongs to Glyptodontini'
- 'Heterohyus belongs to Apatemyidae'
- 'Heteromyoxus belongs to Gliridae'
- 'Heterosminthus belongs to Zapodidae'
- 'Heteroxerus belongs to Sciuridae'
- 'Hexacodus belongs to Homacodontini'
- 'Hexaprotodon belongs to Hippopotaminae'
- 'Hibbarderix belongs to Plesiosoricidae'
- 'Hibbardomys belongs to Cricetidae'
- 'Hippohyini belongs to Suinae'
- 'Hippohyus belongs to Hippohyini'
- 'Hippopotamidae belongs to Suoidea'
- 'Hippopotaminae belongs to Hippopotamidae'
- 'Hippopotamodon belongs to Suini'
- 'Hippopotamus belongs to Hippopotaminae'
- 'Histriophoca is a subjective synonym of Phoca'
- 'Hitonkala belongs to Florentiamyidae'
- 'Hiwegicyon belongs to Macroscelididae'
- 'Hoanghonius belongs to Omomyidae'
- 'Hodomys belongs to Cricetidae'
- 'Holochilus belongs to Cricetidae'
- 'Holoclemensia belongs to Holoclemensiidae'
- 'Holoclemensiidae belongs to Trituberculata'
- 'Homacodon belongs to Homacodontini'
- 'Homacodontidae was reranked as the subfamily Homacodontinae and belongs to Dichobunidae'
- 'Homacodontini belongs to Homacodontinae'
- 'Homocetus is a subjective synonym of Scaldicetus'
- 'Homiphoca belongs to Lobodontina'
- 'Homo belongs to Hominidae'
- 'Homunculus belongs to Atelidae'
- 'Honanodon belongs to Hapalodectidae'
- 'Hoplocetinae belongs to Physeteridae'
- 'Hoplocetus belongs to Hoplocetinae'
- 'Hoplocetus crassidens belongs to Hoplocetus' according to P. Gervais 1848
- 'Hoplophorini belongs to Hoplophorinae'
- 'Hoplophorus belongs to Hoplophorini'
- 'Hoplophractus belongs to Hoplophorini'
- 'Hoplotherium is a subjective synonym of Anoplotherium'
- 'Hsiuannania belongs to Lagomorpha'
- 'Huananothema belongs to Anthracotheriidae'
- 'Huerfanius belongs to Omomyidae'
- 'Huerzeleris belongs to Adapidae'
- 'Hukoutherium belongs to Mesonychidae'
- 'Hyaenodictis is a subjective synonym of Dissacus'
- 'Hyaenodon belongs to Hyaenodontidae'
- 'Hyaenodon (Isohyaenodon) was reranked as Isohyaenodon and belongs to Hyaenodontidae'
- 'Hyaenodontipus belongs to Hyaenodontidae'
- 'Hyaenodontops belongs to Thylacosmilidae'
- 'Hyaenaelurus is a misspelling of Hyainailouros'
- 'Hyaenailurus is a misspelling of Hyainailouros'
- 'Hydrarchina is a subjective synonym of Basilosauridae'
- 'Hydrarctos belongs to Arctocephalinae'
- 'Hydrochoerus belongs to Hydrochoeridae'
- 'Hydromys belongs to Muridae'
- 'Hyemoschus belongs to Tragulidae'
- 'Hyaemoschus is a misspelling of Hyemoschus'
- 'Hylobates belongs to Hylobatidae'
- 'Hylochoerus belongs to Potamochoerini'
- 'Hylomeryx belongs to Bunomerycini'
- 'Hyoboops is a subjective synonym of Sivameryx'
- 'Hyoenodictis is a subjective synonym of Dissacus'
- 'Hyomeryx is a subjective synonym of Protoreodon'
- 'Hyops is a subjective synonym of Platygonus'
- 'Hyotheridium belongs to Deltatheridiidae'
- 'Hyotheriinae belongs to Suidae'
- 'Hyotherium belongs to Hyotheriinae'
- 'Hyperdichobune belongs to Hyperdichobunini'
- 'Hyperdichobunini belongs to Dichobuninae'
- 'Hyperdidelphys belongs to Didelphini'
- 'Hyperoodon belongs to Hyperoodontidae'
- 'Hyperoodontina was reranked as the family Hyperoodontidae and belongs to Hyperoodontoidea'
- 'Hyperoodontini is a subjective synonym of Hyperoodontidae'
- 'Hyperoodontoidea belongs to Odontoceti'
- 'Hypnomys belongs to Gliridae'
- 'Hypocetus is a subjective synonym of Diaphorocetus'
- 'Hypolagus belongs to Leporidae'
- 'Hypotherium is a subjective synonym of Hyotherium'
- 'Hypsiprymnodon belongs to Macropodidae'
- 'Hypsosteiromys belongs to Erethizontidae'
- 'Hyracidae is a subjective synonym of Procaviidae'
- 'Hyracodon is a subjective synonym of Diplobune'
- 'Hyracodon is a subjective synonym of Caenolestes'
- 'Hyracodontherium is a subjective synonym of Diplobune'
- 'Hyrocodon is a subjective synonym of Diplobune'
- 'Hystricognatha belongs to Rodentia'
- 'Hystricognathi was reranked as a infraorder and belongs to Hystricognatha'
- 'Hystrix belongs to Hystricidae'
- 'Hystrix (Hystricops) was reranked as Hystricops and belongs to Castoridae'
- 'Ibarus belongs to Leptochoerinae'
- 'Ichthyolestes belongs to Pakicetidae'
- 'Ideodelphys belongs to Marsupialia'
- 'Idiocetus belongs to Balaenopterinae'
- 'Idiophyseter belongs to Physeterinae'
- 'Idiorophus belongs to Hoplocetinae'
- 'Ignacius belongs to Paromomyidae'
- 'Imagotaria belongs to Odobenini'
- 'Imerocetus belongs to Cetotheriidae'
- 'Imerodelphis belongs to Autoceta'
- 'Imperatoria is a subjective synonym of Prodissopsalis'
- 'Incacetus belongs to Autoceta'
- 'Indocetus belongs to Protocetinae'
- 'Indohyus belongs to Raoellidae'
- 'Indopacetus belongs to Hyperoodontidae'
- 'Indraloris belongs to Adapidae'
- 'Inia belongs to Iniidae'
- 'Iniana was reranked as the family Iniidae and belongs to Delphinoidea'
- 'Iniinae is a subjective synonym of Iniidae'
- 'Iniopsis belongs to Autoceta'
- 'Iqualadelphis belongs to Marsupialia'
- 'Irhoudia belongs to Ctenodactylidae'
- 'Ischnodon belongs to Thylacomyidae'
- 'Ischymomys belongs to Cricetidae'
- 'Ischyrodidelphis belongs to Marsupialia'
- 'Ischyromyidae belongs to Protrogomorpha'
- 'Ischyromys belongs to Ischyromyidae'
- 'Ischyrorhynchus belongs to Iniidae'
- 'Ishatherium belongs to Anthracobunidae'
- 'Isocetus belongs to Cetotheriidae'
- 'Isodactylus is a subjective synonym of Pachychoerops'
- 'Isolinia belongs to Hoplophorini'
- 'Isomyopotamus belongs to Capromyidae'
- 'Isoodon belongs to Peramelidae'
- 'Isostylomys is a subjective synonym of Eumegamys'
- 'Issiodoromys belongs to Theridomyidae'
- 'Isthmomys belongs to Cricetidae'
- 'Isutaetus belongs to Euphractini'
- 'Ithygrammodon belongs to Helohyidae'
- 'Iugomortiferum belongs to Marsupialia'
- 'Ixacanthus belongs to Autoceta'
- 'Jacobsomys belongs to Cricetidae'
- 'Janimus belongs to Eutypomyidae'
- 'Jaskhadelphys belongs to Ameridelphia'
- 'Javazapus belongs to Zapodidae'
- 'Jaywilsonomys belongs to Cylindrodontidae'
- 'Jemezius belongs to Omomyidae'
- 'Jepsenella belongs to Apatemyidae'
- 'Jiangxia belongs to Mesonychidae'
- 'Jimomys belongs to Protrogomorpha'
- 'Jozaria belongs to Anthracobunidae'
- 'Kampholophinae belongs to Kentriodontidae'
- 'Kampholophos [misspelled as Kampholophus] belongs to Kampholophinae'
- 'Kamptobaatar belongs to Taeniolabididae'
- 'Kamtschatarctos belongs to Odobenini'
- 'Kanisamys belongs to Cricetidae'
- 'Kansasimys belongs to Eomyidae'
- 'Karakoromys [misspelled as Karakoramys] belongs to Ctenodactylidae'
- 'Karnimata belongs to Muridae'
- 'Keeuna belongs to Dasyuridae'
- 'Kekenodon belongs to Kekenodontidae'
- 'Kekenodontinae was reranked as the family Kekenodontidae and belongs to Mysticeti'
- 'Kelloggia belongs to Squalodontidae'
- 'Kennalestes belongs to Kennalestidae'
- 'Kentriodon belongs to Kentriodontinae'
- 'Kentriodontidae belongs to Delphinoidea'
- 'Kentriodontinae belongs to Kentriodontidae'
- 'Kenyamys belongs to Kenyamyidae'
- 'Kenyapotaminae belongs to Hippopotamidae'
- 'Kenyapotamus belongs to Kenyapotaminae'
- 'Kenyasus belongs to Kubanochoerinae'
- 'Kepolestes belongs to Dryolestidae'
- 'Keramidomys belongs to Eomyidae'
- 'Kermackia belongs to Kermackiidae'
- 'Kermackiidae belongs to Trituberculata'
- 'Khashanagale belongs to Oxyclaenidae'
- 'Khirtharia belongs to Raoellidae'
- 'Kielantherium belongs to Aegialodontidae'
- 'Kiinkerishella belongs to Paroxyclaenidae'
- 'Kimbetohia belongs to Ptilodontidae'
- 'Kirkomys belongs to Florentiamyidae'
- 'Kislangia belongs to Cricetidae'
- 'Kiyutherium belongs to Hydrochoeridae'
- 'Knightomys belongs to Sciuravidae'
- 'Koalemus belongs to Diprotodontidae'
- 'Kochictis belongs to Paroxyclaenidae'
- 'Kogia belongs to Kogiinae'
- 'Kogiinae belongs to Physeteridae'
- 'Kogiopsis belongs to Kogiinae'
- 'Kohatius belongs to Omomyidae'
- 'Kokopellia belongs to Marsupialia'
- 'Kolopsis belongs to Diprotodontidae'
- 'Kolopsoides belongs to Diprotodontidae'
- 'Kolpochoerus belongs to Potamochoerini'
- 'Kolponomos belongs to Phocoidea'
- 'Komba belongs to Lorisidae'
- 'Koobor belongs to Phascolarctidae'
- 'Kopidodon belongs to Paroxyclaenidae'
- 'Korynochoerus belongs to Suini'
- 'Kraglievichia belongs to Pampatheriidae'
- 'Kronokotherium belongs to Desmostylidae'
- 'Kryptobaatar belongs to Eucosmodontidae'
- 'Kubanochoerinae belongs to Suidae'
- 'Kubanochoerus belongs to Kubanochoerinae'
- 'Kuehneodon belongs to Paulchoffatiidae'
- 'Kuehneon belongs to Kuehneotheriidae'
- 'Kuehneotherium belongs to Kuehneotheriidae'
- 'Kukusepasutanka belongs to Anthracotheriidae'
- 'Kunmunella belongs to Raoellidae'
- 'Kurtodon belongs to Dryolestidae'
- 'Labidolemur belongs to Apatemyidae'
- 'Lagenodelphis belongs to Delphininae'
- 'Lagenorhynchus belongs to Delphininae'
- 'Leucopleurus is a subjective synonym of Lagenorhynchus'
- 'Lagomyidae is a subjective synonym of Ochotonidae'
- 'Lagorchestes belongs to Macropodidae'
- 'Lagostomopsis belongs to Chinchillidae'
- 'Lagostomus belongs to Chinchillidae'
- 'Lagotherium belongs to Leporidae'
- 'Lagurodon belongs to Cricetidae'
- 'Lagurus belongs to Cricetidae'
- 'Lambdopsalis belongs to Taeniolabididae'
- 'Lambertocyon belongs to Arctocyonidae'
- 'Lammidhania belongs to Anthracobunidae'
- 'Lamprolithax belongs to Autoceta'
- 'Landenodon belongs to Arctocyonidae'
- 'Laolestes belongs to Dryolestidae'
- 'Laopithecus is a subjective synonym of Leptochoerus'
- 'Laredochoerus belongs to Leptochoerinae'
- 'Laredomyidae belongs to Protrogomorpha'
- 'Laredomys belongs to Laredomyidae'
- 'Lasiopodomys belongs to Cricetidae'
- 'Lasiorhinus belongs to Vombatidae'
- 'Laugaritiomys belongs to Cricetidae'
- 'Leakeymys belongs to Cricetidae'
- 'Leakitherium belongs to Hyaenodontidae'
- 'Leggada is a subjective synonym of Mus'
- 'Leidymys belongs to Cricetidae'
- 'Leipsanolestes belongs to Erinaceomorpha'
- 'Leithia belongs to Gliridae'
- 'Lemmiscus belongs to Cricetidae'
- 'Lemmus belongs to Cricetidae'
- 'Lemniscomys belongs to Muridae'
- 'Lemoynea belongs to Talpidae'
- 'Lepitherium is a subjective synonym of Glyptodon'
- 'Lepoides belongs to Leporidae'
- 'Leptadapis belongs to Adapidae'
- 'Leptauchenia (Sespia) was reranked as Sespia and belongs to Sespiini'
- 'Leptaucheniinae belongs to Oreodontidae'
- 'Leptaucheniini belongs to Leptaucheniinae'
- 'Leptictida belongs to Eutheria'
- 'Leptictidae belongs to Leptictida'
- 'Leptictis belongs to Leptictidae'
- 'Leptochoerinae belongs to Dichobunidae'
- 'Leptodelphis belongs to Kentriodontinae'
- 'Leptodontomys belongs to Eomyidae'
- 'Leptonysson belongs to Leptictidae'
- 'Leptophoca belongs to Phocini'
- 'Leptotataromys belongs to Ctenodactylidae'
- 'Leptotheridium belongs to Dacrytheriidae'
- 'Leptotomus belongs to Ischyromyidae'
- 'Lepus belongs to Leporidae'
- 'Leucorhamphus is a subjective synonym of Lissodelphis'
- 'Leukaristomys belongs to Cricetidae'
- 'Libycochoerus belongs to Kubanochoerinae'
- 'Libycosaurus is a subjective synonym of Merycopotamus'
- 'Libypithecus belongs to Cercopithecidae'
- 'Ligerimys belongs to Eomyidae'
- 'Limaconyssus belongs to Nyctitheriidae'
- 'Limnenetes belongs to Leptaucheniini'
- 'Limnopithecus belongs to Pliopithecidae'
- 'Limnostonyx is a subjective synonym of Microstonyx'
- 'Liodontia belongs to Aplodontidae'
- 'Liolithax belongs to Kampholophinae'
- 'Liomys belongs to Heteromyidae'
- 'Liotomus belongs to Cimolodontidae'
- 'Lipotes belongs to Lipotidae'
- 'Lipotidae belongs to Delphinoidea'
- 'Lissodelphis belongs to Delphininae'
- 'Listriodon belongs to Listriodontinae'
- 'Listriodontinae belongs to Suidae'
- 'Litaletes belongs to Mioclaenidae'
- 'Litodontomys belongs to Dasyproctidae'
- 'Litokoala belongs to Phascolarctidae'
- 'Litolagus belongs to Leporidae'
- 'Litoyoderimys belongs to Eomyidae'
- 'Llanocetidae belongs to Mysticeti'
- 'Llanocetus belongs to Llanocetidae'
- 'Lobodon belongs to Lobodontina'
- 'Lobodontini was reranked as the subtribe Lobodontina and belongs to Monachini'
- 'Lohoodon belongs to Hapalodectidae'
- 'Lomacetus belongs to Phocoenidae'
- 'Lomaphorelus belongs to Glyptodontidae'
- 'Lomaphorini belongs to Hoplophorinae'
- 'Lomaphorops belongs to Lomaphorini'
- 'Lomaphorus belongs to Lomaphorini'
- 'Lomomys belongs to Dasyproctidae'
- 'Lonchodelphis belongs to Autoceta'
- 'Lophiobunodon belongs to Haplobunodontidae'
- 'Lophiohyus belongs to Helohyidae'
- 'Lophiomyidae is a subjective synonym of Muridae'
- 'Lophiparamys belongs to Ischyromyidae'
- 'Lophocetinae belongs to Kentriodontidae'
- 'Lophocoerus belongs to Tetraconodontinae'
- 'Lopholistriodon belongs to Listriodontinae'
- 'Loricata is a subjective synonym of Cingulata'
- 'Loupomys belongs to Cricetidae'
- 'Loveina belongs to Omomyidae'
- 'Loxaulax belongs to Plagiaulacidae'
- 'Loxodonta belongs to Loxodontina'
- 'Loxodontina belongs to Elephantini'
- 'Loxolithax belongs to Autoceta'
- 'Loxolophus belongs to Arctocyonidae'
- 'Loxomylus is a subjective synonym of Tetrastylus'
- 'Luantus belongs to Eocardiidae'
- 'Luribayomys belongs to Rodentia'
- 'Lushilagus belongs to Lagomorpha'
- 'Lushius belongs to Adapidae'
- 'Lutzia belongs to Diacodexinae'
- 'Lycopsis belongs to Borhyaenidae'
- 'Macaca belongs to Cercopithecidae'
- 'Machairodontinae belongs to Felidae'
- 'Machlydotherium belongs to Pampatheriidae'
- 'Macrochirifer belongs to Autoceta'
- 'Macrochorobates is an objective synonym of Acantharodeia'
- 'Macrochorobates belongs to Dasypodidae' according to G. J. Scillato Yané 1980
- 'Macrodelphinus belongs to Rhabdosteidae'
- 'Macroeuphractus belongs to Euphractini'
- 'Macrognathomys belongs to Zapodidae'
- 'Macropidae is corrected as Macropodidae and belongs to Phalangeroidea'
- 'Macropina is a subjective synonym of Macropodidae'
- 'Macropus belongs to Macropodidae'
- 'Macroscelides belongs to Macroscelididae'
- 'Macrotarsius belongs to Omomyidae'
- 'Mahgarita belongs to Adapidae'
- 'Malacothrix belongs to Muridae'
- 'Malthacolestes belongs to Dryolestidae'
- 'Mammalia belongs to Synapsida'
- 'Mammalodontidae belongs to Mysticeti'
- 'Mammut belongs to Mammutinae'
- 'Mammuthus belongs to Elephantina'
- 'Mammutidae belongs to Mammutoidea'
- 'Mammutinae belongs to Mammutidae'
- 'Mammutoidea was reranked as a superfamily and belongs to Proboscidea'
- 'Manchurodon belongs to Amphidontidae'
- 'Manitsha belongs to Ischyromyidae'
- 'Marfilomys belongs to Protrogomorpha'
- 'Marmota belongs to Sciuridae'
- 'Marsholestes belongs to Geolabididae'
- 'Marsupialia was reranked as a order and belongs to Metatheria'
- 'Marsupiata is a subjective synonym of Marsupialia'
- 'Marsupionta is a subjective synonym of Marsupialia'
- 'Maruchito belongs to Echimyidae'
- 'Masilabune [misspelled as Masillabune] belongs to Haplobunodontidae'
- 'Masrasector belongs to Hyaenodontidae'
- 'Masritherium belongs to Anthracotheriidae'
- 'Mastacomys belongs to Muridae'
- 'Mastodon (Zygolophodon) was reranked as Zygolophodon and belongs to Mammutinae'
- 'Mastomys belongs to Muridae'
- 'Mattimys belongs to Eutypomyidae'
- 'Mauicetus belongs to Cetotheriidae'
- 'Mckennamorphus belongs to Omomyidae'
- 'Medocinia belongs to Hyperoodontidae'
- 'Megabathygenys belongs to Oreonetinae'
- 'Megacerini belongs to Cervinae'
- 'Megaceros is an objective synonym of Megaloceros'
- 'Megactenomys belongs to Ctenomyidae'
- 'Megadelphus belongs to Microsyopidae'
- 'Megaladapis belongs to Megaladapidae'
- 'Megalagus belongs to Leporidae'
- 'Megaloceros belongs to Megacerini'
- 'Megalochoerus belongs to Kubanochoerinae'
- 'Megamys is a subjective synonym of Eumegamys'
- 'Megapedetes belongs to Pedetidae'
- 'Megaptera belongs to Balaenopterinae'
- 'Megaptera (Eschrichtius) was reranked as Eschrichtius and belongs to Eschrichtiidae'
- 'Megapterinae belongs to Balaenopteridae' according to Flower 1864
- 'Megapterinae is a subjective synonym of Balaenopterinae'
- 'Megapteropsis belongs to Balaenopterinae'
- 'Megasespia belongs to Sespiini'
- 'Megasminthus belongs to Zapodidae'
- 'Megastus belongs to Eocardiidae'
- 'Megistotherium belongs to Hyaenodontidae'
- 'Meizonyx belongs to Megalonychidae'
- 'Meldimys belongs to Protrogomorpha'
- 'Meliakrouniomys belongs to Protrogomorpha'
- 'Meniscodon belongs to Dichobunini'
- 'Meniscoessus belongs to Taeniolabididae'
- 'Meniscolophus belongs to Diprotodontidae'
- 'Meniscomys belongs to Aplodontidae'
- 'Menotherium is a subjective synonym of Stibarus'
- 'Mentoclaenodon belongs to Arctocyonidae'
- 'Meridiungulata belongs to Eutheria'
- 'Merycopater is a subjective synonym of Agriochoerus'
- 'Merycopotamus belongs to Anthracotheriidae'
- 'Merycops belongs to Anthracotheriidae'
- 'Mesagriochoerus is a subjective synonym of Protoreodon'
- 'Mesenodon belongs to Toxodontinae'
- 'Mesocetus is a subjective synonym of Diaphorocetus'
- 'Mesocetus belongs to Cetotheriidae'
- 'Mesocricetus belongs to Cricetidae'
- 'Mesodma belongs to Ptilodontidae'
- 'Mesogaulus belongs to Mylagaulidae'
- 'Mesomeryx belongs to Bunomerycini'
- 'Mesonychidae belongs to Acreodi'
- 'Mesonyx belongs to Mesonychidae'
- 'Mesopithecus belongs to Cercopithecidae'
- 'Mesoplodon belongs to Hyperoodontidae'
- 'Mesoplodon (Cetorhynchus) was reranked as Cetorhynchus and belongs to Hyperoodontidae'
- 'Mesopropithecus belongs to Indriidae'
- 'Mesotaria belongs to Monachina'
- 'Mesoteras belongs to Balaenidae'
- 'Mesotoxodon belongs to Haplodontheriinae'
- 'Messapicetus belongs to Hyperoodontidae'
- 'Messelobunodon belongs to Dichobunini'
- 'Messiphoca belongs to Monachina'
- 'Metacodontidae is a subjective synonym of Geolabididae'
- 'Metadelphia is a subjective synonym of Marsupialia'
- 'Metadjidaumo belongs to Eomyidae'
- 'Metahapalodectes belongs to Hapalodectidae'
- 'Metanoiamys belongs to Eomyidae'
- 'Metaphiomys belongs to Phiomyidae'
- 'Metapterodon belongs to Hyaenodontidae'
- 'Metasayimys belongs to Ctenodactylidae'
- 'Metasinopa belongs to Hyaenodontidae'
- 'Metasqualodon belongs to Squalodontidae'
- 'Metatheria is a subjective synonym of Marsupialia'
- 'Meteutatus belongs to Eutatini'
- 'Metkamys belongs to Protrogomorpha'
- 'Metkatius belongs to Raoellidae'
- 'Metoldobotes belongs to Macroscelididae'
- 'Metopocetus belongs to Cetotheriidae'
- 'Metopotoxus belongs to Propalaehoplophorinae'
- 'Metridiochoerus belongs to Phacochoerini'
- 'Metriotherium belongs to Dichobunini'
- 'Micrabderites belongs to Caenolestidae'
- 'Microadapis belongs to Adapidae'
- 'Microbiotheridae is corrected as Microbiotheriidae and belongs to Didelphoidea'
- 'Microbiotherium belongs to Microbiotheriidae'
- 'Microbunodon belongs to Anthracotheriidae'
- 'Microcavia belongs to Caviidae'
- 'Microcetus belongs to Squalodontidae'
- 'Microchoerus belongs to Omomyidae'
- 'Microclaenodon belongs to Acreodi'
- 'Microcosmodon belongs to Eucosmodontidae'
- 'Microcricetus belongs to Cricetidae'
- 'Microdipodops belongs to Geomyidae'
- 'Microdyromys [misspelled as Microdryomys] belongs to Gliridae'
- 'Microeutypomys belongs to Eutypomyidae'
- 'Micromomyidae belongs to Paromomyoidea'
- 'Micromomys belongs to Micromomyidae'
- 'Micromys belongs to Cricetidae'
- 'Microparamys belongs to Ischyromyidae'
- 'Microphocaena belongs to Kentriodontinae'
- 'Microsqualodon is a subjective synonym of Neosqualodon'
- 'Microstonyx belongs to Suini'
- 'Microsuevosciurus belongs to Theridomyidae'
- 'Microsus belongs to Homacodontini'
- 'Microsyopidae belongs to Paromomyoidea'
- 'Microsyops belongs to Microsyopidae'
- 'Microtarsioides is a subjective synonym of Amphiperatherium'
- 'Microtodon belongs to Cricetidae'
- 'Microtoscoptes belongs to Cricetidae'
- 'Microtragulus belongs to Argyrolagidae'
- 'Microtus belongs to Cricetidae'
- 'Microzeuglodon belongs to Autoceta'
- 'Mictodon belongs to Tinodontidae'
- 'Mictomys belongs to Cricetidae'
- 'Migraveramus belongs to Acaremyinae'
- 'Mimetodon belongs to Ptilodontidae'
- 'Mimolagus belongs to Lagomorpha'
- 'Mimomys belongs to Cricetidae'
- 'Mimoperadectes belongs to Didelphidae'
- 'Mimotona belongs to Lagomorpha'
- 'Mimotricentes belongs to Arctocyonidae'
- 'Mingotherium belongs to Pseudictopidae'
- 'Minitoxodon belongs to Toxodontinae'
- 'Mioceta is a nomen dubium'
- 'Miochomys belongs to Cricetidae'
- 'Mioclaenus belongs to Mioclaenidae'
- 'Miodelphis belongs to Autoceta'
- 'Mioeuoticus belongs to Lorisidae'
- 'Mioglis belongs to Gliridae'
- 'Miokogia belongs to Kogiinae'
- 'Miorhynchocyon belongs to Macroscelididae'
- 'Miosciurus belongs to Sciuridae'
- 'Miosicista belongs to Zapodidae'
- 'Miospermophilus belongs to Sciuridae'
- 'Mioziphius is a subjective synonym of Ziphirostrum'
- 'Mirocetus belongs to Autoceta'
- 'Mirounga belongs to Monachina'
- 'Mixocetus belongs to Cetotheriidae'
- 'Mixodectes belongs to Mixodectidae'
- 'Mixodectidae belongs to Dermoptera'
- 'Mixtotheriidae belongs to Dichobunoidea'
- 'Mixtotherium belongs to Mixtotheriidae'
- 'Mizuhoptera belongs to Mysticeti'
- 'Moeritheriidae belongs to Proboscidea'
- 'Moeritherium belongs to Moeritheriidae'
- 'Moiachoerus belongs to Cebochoeridae'
- 'Mojavemys belongs to Geomyidae'
- 'Molossops belongs to Molossinae'
- 'Monachina belongs to Monachini'
- 'Monachini belongs to Phocinae'
- 'Monachopsis belongs to Monachina'
- 'Monachus belongs to Monachina'
- 'Mongolestes belongs to Mesonychidae'
- 'Mongolonyx belongs to Mesonychidae'
- 'Monodelphini belongs to Didelphinae'
- 'Monodon belongs to Monodontinae'
- 'Monodontidae belongs to Delphinoidea'
- 'Monodontina is an invalid subgroup of Monodontinae'
- 'Monodontinae belongs to Monodontidae'
- 'Monosaulax belongs to Castoridae'
- 'Monotherium belongs to Monachina'
- 'Montanamus belongs to Eomyidae'
- 'Mookomys belongs to Heteromyidae'
- 'Morenocetus belongs to Balaenidae'
- 'Mormoops belongs to Mormoopidae'
- 'Mouillacitherium belongs to Hyperdichobunini'
- 'Multituberculata belongs to Allotheria'
- 'Mus belongs to Muridae'
- 'Mus (Calomys) was reranked as Calomys and belongs to Cricetidae'
- 'Muscardinus belongs to Gliridae'
- 'Mylagaulodon belongs to Mylagaulidae'
- 'Mylagaulus belongs to Mylagaulidae'
- 'Mylohyus belongs to Tayassuinae'
- 'Mylomygale belongs to Macroscelididae'
- 'Myocastorinae belongs to Echimyidae'
- 'Myocricetodon belongs to Cricetidae'
- 'Myocricetodontinae was reranked as the tribe Myocricetodontini and belongs to Gerbillinae'
- 'Myoglis belongs to Gliridae'
- 'Myohyrax belongs to Macroscelididae'
- 'Myomimus belongs to Gliridae'
- 'Myophiomys belongs to Myophiomyidae'
- 'Myospalax belongs to Cricetidae'
- 'Myotomys belongs to Muridae'
- 'Myoxidae belongs to Glirimorpha'
- 'Myrmecobiidae belongs to Dasyuroidea'
- 'Myrmecobius belongs to Myrmecobiidae'
- 'Myrmecoboides belongs to Leptictidae'
- 'Mysops belongs to Cylindrodontidae'
- 'Mystacoceta is a subjective synonym of Mysticeti'
- 'Mystacoceti is a subjective synonym of Mysticeti'
- 'Mysticeti was reranked as a unranked clade and belongs to Autoceta'
- 'Mystromys belongs to Cricetidae'
- 'Mytonolagus belongs to Leporidae'
- 'Mytonomeryx belongs to Bunomerycini'
- 'Mytonomys belongs to Ischyromyidae'
- 'Nakunodon belongs to Amphidontidae'
- 'Namachoerinae belongs to Suidae'
- 'Namachoerus belongs to Namachoerinae'
- 'Namatomys belongs to Eomyidae'
- 'Nambaroo belongs to Macropodidae'
- 'Nannocetus belongs to Cetotheriidae'
- 'Nannodectes belongs to Plesiadapidae'
- 'Nannolithax belongs to Autoceta'
- 'Nannopithex belongs to Omomyidae'
- 'Nanochoerus is a subjective synonym of Leptochoerus'
- 'Nanodelphys belongs to Didelphidae'
- 'Napaeozapus belongs to Zapodidae'
- 'Navajovius belongs to Microsyopidae'
- 'Neatocastor belongs to Castoridae'
- 'Nebraskomys belongs to Cricetidae'
- 'Necrolemur belongs to Omomyidae'
- 'Necrolestidae belongs to Marsupialia'
- 'Necromites belongs to Phocinae'
- 'Nekrolagus belongs to Leporidae'
- 'Nelsonia belongs to Cricetidae'
- 'Nemegtbaatar belongs to Eucosmodontidae'
- 'Nementchamys belongs to Anomaluridae'
- 'Nemolestes belongs to Borhyaenidae'
- 'Neoanchimys belongs to Hydrochoeridae'
- 'Neobalaena is a subjective synonym of Caperea'
- 'Neocavia belongs to Caviidae'
- 'Neochoerus belongs to Hydrochoeridae'
- 'Neocometes belongs to Cricetidae'
- 'Neodiacodexis belongs to Diacodexinae'
- 'Neofiber belongs to Cricetidae'
- 'Neoglyptatelus belongs to Glyptatelinae'
- 'Neohelos belongs to Diprotodontidae'
- 'Neoliotomus belongs to Eucosmodontidae'
- 'Neondatra belongs to Cricetidae'
- 'Neophanomys belongs to Eocardiidae'
- 'Neophoca belongs to Otariinae'
- 'Neophocaena belongs to Phocoeninae'
- 'Neoplagiaulax belongs to Ptilodontidae'
- 'Neoreomys belongs to Dasyproctidae'
- 'Neosaimiri belongs to Cebidae'
- 'Neosciuromys belongs to Theridomyidae'
- 'Neosclerocalyptus belongs to Hoplophorini'
- 'Neosqualodon belongs to Squalodontidae'
- 'Neosteiromys belongs to Erethizontidae'
- 'Neotherium belongs to Odobenini'
- 'Neothoracophorini belongs to Glyptodontidae'
- 'Neothoracophorus belongs to Neothoracophorini'
- 'Neotoma belongs to Cricetidae'
- 'Neotoxodon belongs to Toxodontinae'
- 'Nerterogeomys belongs to Geomyidae'
- 'Nesokia belongs to Muridae'
- 'Neufferia belongs to Dichobunini'
- 'Neuryurini belongs to Hoplophorinae'
- 'Neuryurus belongs to Neuryurini'
- 'Ngapakaldia belongs to Palorchestidae'
- 'Nguruwe belongs to Kubanochoerinae'
- 'Nievella belongs to Gliridae'
- 'Niglarodon belongs to Aplodontidae'
- 'Ninoziphius belongs to Hyperoodontidae'
- 'Niphredil belongs to Pantolestidae'
- 'Niptomomys belongs to Microsyopidae'
- 'Nonomys belongs to Simimyidae'
- 'Nopachtus belongs to Panochthini'
- 'Notharctus belongs to Adapidae'
- 'Nothocyon belongs to Phocoidea'
- 'Notictis belongs to Borhyaenidae'
- 'Notiocetus belongs to Balaenopterinae'
- 'Notiomastodon belongs to Cuvieroniini'
- 'Notocetus belongs to Hyperoodontidae'
- 'Notochoerus belongs to Tetraconodontinae'
- 'Notocricetodon belongs to Cricetidae'
- 'Notocynus belongs to Borhyaenidae'
- 'Notogale belongs to Borhyaenidae'
- 'Notolagus belongs to Leporidae'
- 'Notoparamys belongs to Ischyromyidae'
- 'Notoryctidae belongs to Dasyuroidea'
- 'Notosmilus belongs to Thylacosmilidae'
- 'Nototamias belongs to Sciuridae'
- 'Nototherium belongs to Diprotodontidae'
- 'Numidotheriidae belongs to Proboscidea'
- 'Numidotherium belongs to Numidotheriidae'
- 'Nunezia is a subjective synonym of Myrmecophaga'
- 'Nyanzachoerus belongs to Tetraconodontinae'
- 'Nyctitheriidae belongs to Soricomorpha'
- 'Ocajila belongs to Erinaceidae'
- 'Occitanomys belongs to Muridae'
- 'Ochotona belongs to Ochotonidae'
- 'Ochrotomys belongs to Cricetidae'
- 'Octacodon is a subjective synonym of Heptacodon'
- 'Octodontobradys belongs to Orophodontidae'
- 'Odobenina belongs to Odobenini'
- 'Odobeninae belongs to Phocidae'
- 'Odobenini belongs to Odobeninae'
- 'Odobenocetops belongs to Odobenocetopsidae'
- 'Odobenocetopsidae belongs to Delphinoidea'
- 'Odobenotherium is a subjective synonym of Odobenus'
- 'Odobenus belongs to Odobenina'
- 'Odoichoerus belongs to Tayassuidae'
- 'Odontoceta is a subjective synonym of Odontoceti'
- 'Odontoceti was reranked as a unranked clade and belongs to Autoceta'
- 'Oedolithax belongs to Autoceta'
- 'Ogmodontomys belongs to Cricetidae'
- 'Ogmorhinus is a subjective synonym of Hydrurga'
- 'Oklahomalagus belongs to Ochotonidae'
- 'Olenopsis belongs to Dasyproctidae'
- 'Oligodelphis belongs to Autoceta'
- 'Oligodyromys belongs to Gliridae'
- 'Oligopetes belongs to Aplodontidae'
- 'Oligopithecus belongs to Pongidae'
- 'Oligoryctes belongs to Apternodontidae'
- 'Oligospermophilus belongs to Sciuridae'
- 'Olsenia belongs to Acreodi'
- 'Oltinomys belongs to Theridomyidae'
- 'Ommatophoca belongs to Lobodontina'
- 'Omomys belongs to Omomyidae'
- 'Ondatra belongs to Cricetidae'
- 'Onohippidion is a subjective synonym of Onohippidium'
- 'Onychogalea belongs to Macropodidae'
- 'Onychomys belongs to Cricetidae'
- 'Oplotherium is a subjective synonym of Anoplotherium'
- 'Orca (Feresa) was reranked as Feresa and belongs to Globicephalinae'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Orcaellidae'
- 'Orcadae is a subjective synonym of Orcininae'
- 'Orcadina is a subjective synonym of Orcininae'
- 'Orcellidae was reranked as the subfamily Orcaellinae and belongs to Monodontidae'
- 'Orcini was reranked as the subfamily Orcininae and belongs to Delphinidae'
- 'Orcinus belongs to Orcininae'
- 'Ordolagus belongs to Leporidae'
- 'Orelladjidaumo belongs to Eomyidae'
- 'Oreodontidae belongs to Oreodontoidea'
- 'Oreodontoidea belongs to Suiformes'
- 'Oreolagus belongs to Ochotonidae'
- 'Oreonetes belongs to Oreonetinae'
- 'Oreonetinae belongs to Oreodontidae'
- 'Oreopithecus belongs to Oreopithecidae'
- 'Oriensarctos belongs to Odobeninae'
- 'Orientalomys belongs to Muridae'
- 'Oropyctis belongs to Allomyidae'
- 'Orthomyctera belongs to Caviidae'
- 'Orthutaetus is a subjective synonym of Utaetus'
- 'Orycterocetus belongs to Physeterinae'
- 'Oryctolagus belongs to Leporidae'
- 'Oryzomys belongs to Cricetidae'
- 'Osphranter belongs to Macropodidae'
- 'Otaria belongs to Otariinae'
- 'Otariina was reranked as the family Otariidae and belongs to Phocoidea'
- 'Otariinae belongs to Otariidae'
- 'Otoes is a subjective synonym of Otaria'
- 'Otomys belongs to Muridae'
- 'Otradnocetus belongs to Cetotheriidae'
- 'Ourayia belongs to Omomyidae'
- 'Oxacron belongs to Oxacroninae'
- 'Oxacroninae belongs to Cainotheriidae'
- 'Oxyaenoides belongs to Hyaenodontidae'
- 'Oxygomphius is a subjective synonym of Amphiperatherium'
- 'Pachyacanthus belongs to Odontoceti'
- 'Pachyaena belongs to Mesonychidae'
- 'Pachyarmatherium belongs to Glyptatelinae'
- 'Pachycetus is a subjective synonym of Dorudon'
- 'Pachychoerops belongs to Anthracotheriidae'
- 'Pachycynodon belongs to Phocoidea'
- 'Pachypus is a subjective synonym of Glyptodon'
- 'Paciculus belongs to Cricetidae'
- 'Pacificotaria is a subjective synonym of Pteronarctos'
- 'Paenemarmota belongs to Sciuridae'
- 'Paenoxyaenoides belongs to Hyaenodontidae'
- 'Pagomys is a subjective synonym of Phoca'
- 'Pagonomus belongs to Pantolestidae'
- 'Pagophilus is a subjective synonym of Phoca'
- 'Pagophoca is a subjective synonym of Phoca'
- 'Pairomys belongs to Rodentia'
- 'Pakibune belongs to Dichobunidae'
- 'Pakicetinae belongs to Protocetidae'
- 'Pakicetus belongs to Pakicetinae'
- 'Pakkokuhyus belongs to Helohyidae'
- 'Palaearctomys belongs to Sciuridae'
- 'Palaechthon belongs to Palaechthonidae'
- 'Palaechthonidae belongs to Paromomyoidea'
- 'Palaehoplophorini belongs to Hoplophorinae'
- 'Palaeictops belongs to Leptictidae'
- 'Palaeocastor belongs to Castoridae'
- 'Palaeocavia belongs to Caviidae'
- 'Palaeocetidae is a subjective synonym of Balaenopteridae'
- 'Palaeocetus belongs to Balaenopterinae'
- 'Palaeochoerinae belongs to Suidae'
- 'Palaeochoerus belongs to Palaeochoerinae'
- 'Palacodelphis is a subjective synonym of Scaldicetus'
- 'Palaeodoedicurus is a subjective synonym of Prodaedicurus'
- 'Palaeodonta is a subjective synonym of Suiformes'
- 'Palaeoechimys belongs to Eumysopinae'
- 'Palaeoerinaceus is a subjective synonym of Amphechinus'
- 'Palaeohoplophorus belongs to Palaehoplophorini'
- 'Palaeolagus belongs to Leporidae'
- 'Palaeomastodon belongs to Palaeomastodontidae'
- 'Palaeomastodontidae belongs to Proboscidea'
- 'Palaeomys belongs to Castoridae'
- 'Palaeopeltidae belongs to Glyptodontoidea'
- 'Palaeopeltis belongs to Palaeopeltidae'
- 'Palaeopetaurus belongs to Phalangeridae'
- 'Palaeophocaena belongs to Delphinoidea'
- 'Palaeopontoporia is a subjective synonym of Pontistes'
- 'Palaeopotorous belongs to Macropodidae'
- 'Palaeopropithecus belongs to Palaeopropithecidae'
- 'Palaeoryctidae belongs to Cimolesta'
- 'Palaeoscalopus belongs to Talpidae'
- 'Palaeosciurus belongs to Sciuridae'
- 'Palaeosinopa belongs to Pantolestidae'
- 'Palaeothentes belongs to Caenolestidae'
- 'Palaeothentoides belongs to Macroscelididae'
- 'Palaeoxonodon belongs to Peramuridae'
- 'Palaeoziphius belongs to Hyperoodontidae'
- 'Palenochtha belongs to Palaechthonidae'
- 'Paleomolops belongs to Trituberculata'
- 'Paleoparadoxia belongs to Desmostylidae'
- 'Paleophoca belongs to Hoplocetinae'
- 'Paleotomus belongs to Cimolestidae'
- 'Palerinaceus is an objective synonym of Palaeoerinaceus' according to Crusafont and Villalta 1947
- 'Paleuphractus belongs to Euphractini'
- 'Palmidophoca belongs to Monachina'
- 'Palorchestes belongs to Palorchestidae'
- 'Palorchestidae belongs to Vombatoidea'
- 'Pampatheriidae belongs to Glyptodontoidea'
- 'Pampatherium belongs to Pampatheriidae'
- 'Pandemonium belongs to Plesiadapidae'
- 'Panochthini belongs to Hoplophorinae'
- 'Panochthus belongs to Panochthini'
- 'Panolax belongs to Leporidae'
- 'Pantodonta was reranked as a suborder and belongs to Cimolesta'
- 'Pantolambdodontidae belongs to Pantolambdoidea'
- 'Pantolambdoidea belongs to Pantodonta'
- 'Pantolesta was reranked as a suborder and belongs to Cimolesta'
- 'Pantolestes belongs to Pantolestidae'
- 'Pantolestidae belongs to Pantolesta'
- 'Pantomimus belongs to Pantolestidae'
- 'Papio belongs to Cercopithecidae'
- 'Pappocetus belongs to Protocetidae'
- 'Pappotheriidae belongs to Trituberculata'
- 'Pappotherium belongs to Pappotheriidae'
- 'Parabathygenys belongs to Oreonetinae'
- 'Parabderites belongs to Caenolestidae'
- 'Parabrachyodus belongs to Anthracotheriidae'
- 'Parabunodon belongs to Haplobunodontidae'
- 'Paracetus is a subjective synonym of Diaphorocetus'
- 'Parachleuastochoerus belongs to Tetraconodontinae'
- 'Paracimexomys belongs to Multituberculata'
- 'Paracitellus belongs to Protrogomorpha'
- 'Paracolobus belongs to Cercopithecidae'
- 'Paracricetodon belongs to Cricetidae'
- 'Paracricetodontinae belongs to Muridae'
- 'Paracricetulus belongs to Cricetidae'
- 'Paracryptomys belongs to Bathyergidae'
- 'Paracryptotis belongs to Soricidae'
- 'Paracynodon is a subjective synonym of Amphicynodon'
- 'Paracynohyaenodon belongs to Hyaenodontidae'
- 'Paradelphomys belongs to Echimyidae'
- 'Paradidelphys is a subjective synonym of Hyperdidelphys'
- 'Paradipoides belongs to Castoridae'
- 'Paradjidaumo belongs to Eomyidae'
- 'Paradolichopithecus belongs to Cercopithecidae'
- 'Paradomnina belongs to Soricidae'
- 'Paradoxodon is a subjective synonym of Paradoxodonides'
- 'Paradoxodonides belongs to Suidae'
- 'Paraethomys belongs to Muridae'
- 'Paraeuphractus belongs to Euphractini'
- 'Paraeutatus belongs to Eutatini'
- 'Parageomys belongs to Geomyidae'
- 'Paraglirulus belongs to Gliridae'
- 'Paraglyptodon belongs to Glyptodontini'
- 'Parahoplophorus belongs to Hoplophorini'
- 'Parahyaenodon belongs to Borhyaenidae'
- 'Parahyus belongs to Helohyidae'
- 'Paralactaga belongs to Dipodidae'
- 'Parallomys belongs to Allomyidae'
- 'Paramicrotoscoptes belongs to Cricetidae'
- 'Paramylodon belongs to Mylodontidae'
- 'Paramys belongs to Ischyromyidae'
- 'Paramys (Ischyrotomus) was reranked as Ischyrotomus and belongs to Ischyromyidae'
- 'Paranamatomys belongs to Eomyidae'
- 'Paranomalurus belongs to Anomaluridae'
- 'Paranotolagus belongs to Leporidae'
- 'Paranyctoides belongs to Erinaceomorpha'
- 'Parapanochthus belongs to Panochthini'
- 'Parapapio belongs to Cercopithecidae'
- 'Parapedetes belongs to Pedetidae'
- 'Parapelomys belongs to Muridae'
- 'Parapeltecoelus belongs to Peltephilidae'
- 'Paraphenacodus belongs to Dichobunidae'
- 'Paraphiomys belongs to Phiomyidae'
- 'Parapithecus belongs to Parapithecidae'
- 'Parapliosaccomys belongs to Geomyidae'
- 'Parapontoporia belongs to Parapontoporiinae'
- 'Parapontoporiinae belongs to Pontoporiidae'
- 'Parapternodus belongs to Apternodontidae'
- 'Parapterodon belongs to Hyaenodontidae'
- 'Pararhizomys belongs to Rhizomyidae'
- 'Pararyctes belongs to Cimolesta'
- 'Parasminthus belongs to Zapodidae'
- 'Parasqualodon belongs to Squalodontidae'
- 'Parasteiromys belongs to Erethizontidae'
- 'Paratarsomys belongs to Cricetidae'
- 'Paratetralophodon belongs to Elephantidae'
- 'Paratricuspiodon belongs to Tricuspiodontidae'
- 'Paratriisodon belongs to Arctocyonidae'
- 'Paratritemnodon belongs to Hyaenodontidae'
- 'Paraulacodus belongs to Thryonomyidae'
- 'Parectypodus belongs to Ptilodontidae'
- 'Parendotherium belongs to Paulchoffatiidae'
- 'Pareumys belongs to Cylindrodontidae'
- 'Pariadens belongs to Stagodontidae'
- 'Parictis belongs to Phocoidea'
- 'Parietis is an objective synonym of Parictis'
- 'Parietobalaena belongs to Cetotheriidae'
- 'Parodimys belongs to Cardiomyinae'
- 'Paromomyidae belongs to Dermoptera'
- 'Paromomys belongs to Paromomyidae'
- 'Paronychomys belongs to Cricetidae'
- 'Paroxacron belongs to Oxacroninae'
- 'Paroxyaena belongs to Hyaenodontidae'
- 'Paroxyclaenus belongs to Paroxyclaenidae'
- 'Pareutaetus is a subjective synonym of Utaetus'
- 'Pascualia belongs to Caviidae'
- 'Pastoralodontidae belongs to Pantolambdoidea'
- 'Patene belongs to Borhyaenidae'
- 'Patriocetus belongs to Squalodontidae'
- 'Patriotheridomys belongs to Theridomyidae'
- 'Pattersomys belongs to Eumysopinae'
- 'Paulacoutomys belongs to Echimyidae'
- 'Paulchoffatia belongs to Paulchoffatiidae'
- 'Paulchoffatiidae belongs to Plagiaulacoidea'
- 'Paulocnus belongs to Ortotheriinae'
- 'Paurodon belongs to Paurodontidae'
- 'Pauromys belongs to Sciuravidae'
- 'Pecarichoerus belongs to Doliochoerini'
- 'Pedetes belongs to Pedetidae'
- 'Pedimanes is an invalid subgroup of Didelphimorphia'
- 'Pediomyinae was reranked as the family Pediomyidae and belongs to Didelphoidea'
- 'Pediomys belongs to Pediomyidae'
- 'Pedomys belongs to Cricetidae'
- 'Peiranoa belongs to Lomaphorini'
- 'Pelagiarctos belongs to Odobenini'
- 'Pelicopsis belongs to Dryolestidae'
- 'Pelocetus belongs to Cetotheriidae'
- 'Pelodelphis belongs to Autoceta'
- 'Pelomys belongs to Muridae'
- 'Peltecoelus belongs to Peltephilidae'
- 'Peltephilidae belongs to Dasypodoidea'
- 'Peltephilus belongs to Peltephilidae'
- 'Pelycodus belongs to Adapidae'
- 'Pelycomys belongs to Allomyidae'
- 'Pelycorhamphus belongs to Hyperoodontidae'
- 'Pentacemylus belongs to Bunomerycini'
- 'Pentacodon belongs to Pantolestidae'
- 'Pentacosmodon belongs to Sloanbaataridae'
- 'Pentaglis belongs to Gliridae'
- 'Peponocephala belongs to Globicephalinae'
- 'Peradectes belongs to Didelphidae'
- 'Peradectia is a subjective synonym of Didelphimorphia'
- 'Perameles belongs to Peramelidae'
- 'Perameles (Macrotis) was reranked as Macrotis and belongs to Thylacomyidae'
- 'Peramelidae belongs to Perameloidea'
- 'Peramelina is a subjective synonym of Peramelidae'
- 'Perameloidea belongs to Marsupialia'
- 'Peramus belongs to Peramuridae'
- 'Peraspalax belongs to Dryolestidae'
- 'Perathereutes belongs to Borhyaenidae'
- 'Peratherium belongs to Didelphidae'
- 'Perchoerus belongs to Tayassuinae'
- 'Periconodon belongs to Adapidae'
- 'Peridiomys belongs to Heteromyidae'
- 'Peridyromys belongs to Gliridae'
- 'Perikoala belongs to Phascolarctidae'
- 'Perimys belongs to Chinchillidae'
- 'Peripolocetus belongs to Cetotheriidae'
- 'Perognathus belongs to Heteromyidae'
- 'Peromyscus belongs to Cricetidae'
- 'Peroryctes belongs to Peramelidae'
- 'Petauridae belongs to Phalangeroidea'
- 'Petaurinae belongs to Pediomyidae'
- 'Petaurista belongs to Sciuridae'
- 'Petauristodon belongs to Sciuridae'
- 'Petaurus belongs to Petaurinae'
- 'Petaurus belongs to Phalangistina' according to J. E. Gray 1825
- 'Petenyia belongs to Soricidae'
- 'Petinomys belongs to Sciuridae'
- 'Petrogale belongs to Macropodidae'
- 'Petrokozlovia belongs to Ctenodactylidae'
- 'Petrolemur belongs to Adapidae'
- 'Petromus belongs to Thryonomyidae'
- 'Pewelagus belongs to Leporidae'
- 'Phacochoeridae is a subjective synonym of Suidae'
- 'Phacochoerini belongs to Suinae'
- 'Phacochoerus belongs to Phacochoerini'
- 'Phalanger belongs to Phalangeridae'
- 'Phalangeridae belongs to Phalangeroidea'
- 'Phalangeroidea belongs to Diprotodonta'
- 'Phalangistidae is a subjective synonym of Phalangeridae'
- 'Phalangistina is a subjective synonym of Phalangeridae'
- 'Phanomys belongs to Eocardiidae'
- 'Pharsophorus belongs to Borhyaenidae'
- 'Phascogale belongs to Dasyuridae'
- 'Phascolarctidae belongs to Phascolarctoidea'
- 'Phascolarctoidea belongs to Diprotodonta'
- 'Phascolarctos belongs to Phascolarctidae'
- 'Phascolestes belongs to Dryolestidae'
- 'Phascolomyidae is a subjective synonym of Vombatidae'
- 'Phascolomina is a subjective synonym of Vombatidae'
- 'Phascolonus belongs to Vombatidae'
- 'Phascolosorex belongs to Dasyuridae'
- 'Phenacodaptes belongs to Mioclaenidae'
- 'Phenacolemur belongs to Paromomyidae'
- 'Phenacomys belongs to Cricetidae'
- 'Phiocricetomys belongs to Phiomyidae'
- 'Phiomia belongs to Phiomiidae'
- 'Phiomiidae belongs to Proboscidea'
- 'Phiomyoides belongs to Myophiomyidae'
- 'Phiomys belongs to Phiomyidae'
- 'Phlyctaenopyga belongs to Plohophorini'
- 'Phoberodon belongs to Squalodontidae'
- 'Phoca belongs to Phocini'
- 'Phocadae is corrected as Phocidae and belongs to Phocoidea'
- 'Phocaena belongs to Phocoeninae'
- 'Phocaenina was reranked as the family Phocaenidae and belongs to Delphinoidea'
- 'Phocaenopsis belongs to Rhabdosteidae'
- 'Phocageneus belongs to Autoceta'
- 'Phocanella belongs to Phocini'
- 'Phocarctos belongs to Otariinae'
- 'Phocinae belongs to Phocidae'
- 'Phocini belongs to Phocinae'
- 'Phococetus belongs to Kekenodontidae'
- 'Phocodon is a subjective synonym of Squalodon'
- 'Phocoeninae belongs to Phocoenidae'
- 'Phocoenoides belongs to Phocoenoidinae'
- 'Phocoenoidinae belongs to Phocoenidae'
- 'Phocoidea belongs to Ursida'
- 'Pholidota was reranked as a suborder and belongs to Cimolesta'
- 'Phonocdromus belongs to Caenolestidae'
- 'Phosphatherium belongs to Numidotheriidae'
- 'Phthoramys belongs to Octodontidae'
- 'Phyllostomatidae is a subjective synonym of Phyllostomidae'
- 'Physalina is a subjective synonym of Balaenopterinae'
- 'Physeter belongs to Physeterinae'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeterina is a subjective synonym of Physeteridae'
- 'Physeterinae belongs to Physeteridae'
- 'Physeteroidea belongs to Odontoceti'
- 'Physeterula belongs to Physeterinae'
- 'Physetodon belongs to Physeterinae'
- 'Physodontidae is a subjective synonym of Physeteridae'
- 'Pichipilus belongs to Caenolestidae'
- 'Picopsidae belongs to Trituberculata'
- 'Picopsis belongs to Picopsidae'
- 'Picrodus belongs to Picrodontidae'
- 'Picromomyidae belongs to Paromomyoidea'
- 'Picromomys belongs to Picromomyidae'
- 'Pilchenia belongs to Caenolestidae'
- 'Pilgrimella belongs to Anthracobunidae'
- 'Pinnarctidion belongs to Desmatophocini'
- 'Pinnipedia is a subjective synonym of Phocoidea'
- 'Pinocetus belongs to Cetotheriidae'
- 'Pipestoneomys belongs to Protrogomorpha'
- 'Piscobalaena belongs to Cetotheriidae'
- 'Piscobalaena nana belongs to Piscobalaena' according to G. Pilleri and Siber 1989
- 'Piscocetus belongs to Cetotheriidae'
- 'Piscolithax belongs to Phocoenoidinae'
- 'Piscophoca belongs to Lobodontina'
- 'Piscorhynchus belongs to Pontoporiidae'
- 'Pithanodelphis belongs to Kentriodontinae'
- 'Pithanotaria belongs to Otariidae'
- 'Pithanotomys belongs to Octodontidae'
- 'Pithecistes belongs to Leptaucheniini'
- 'Pitheculites belongs to Abderitidae'
- 'Pitikantia belongs to Palorchestidae'
- 'Pitymys belongs to Cricetidae'
- 'Placentalia belongs to Theria'
- 'Placoziphius belongs to Physeterinae'
- 'Plagiaulacidae belongs to Plagiaulacoidea'
- 'Plagiaulacoidea belongs to Multituberculata'
- 'Plagiaulax belongs to Plagiaulacidae'
- 'Plagiocristodon is a subjective synonym of Dissacus'
- 'Plagiomene belongs to Plagiomenidae'
- 'Plagiomenidae belongs to Dermoptera'
- 'Plaisiodon belongs to Diprotodontidae'
- 'Planetetherium belongs to Plagiomenidae'
- 'Planigale belongs to Dasyuridae'
- 'Planisorex belongs to Soricidae'
- 'Platacanthomyidae was reranked as the subfamily Platacanthomyinae and belongs to Muridae'
- 'Platanista belongs to Platanistidae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Platanistoidea'
- 'Platanistoidea belongs to Odontoceti'
- 'Platybelodon belongs to Amebelodontina'
- 'Platychoerops belongs to Plesiadapidae'
- 'Platygonus belongs to Tayassuinae'
- 'Platylithax belongs to Autoceta'
- 'Platyosphys belongs to Archaeoceti'
- 'Platyphoca belongs to Phocini'
- 'Platypittamys belongs to Acaremyinae'
- 'Platyrhynchus is a subjective synonym of Otaria'
- 'Plaxhaplous belongs to Doedicurinae'
- 'Pleregnathus is a subjective synonym of Anoplotherium'
- 'Plesiadapis belongs to Plesiadapidae'
- 'Plesidissacus is a subjective synonym of Dissacus'
- 'Plesiocetus belongs to Balaenopterinae'
- 'Plesiocricetodon belongs to Cricetidae'
- 'Plesiocyon belongs to Phocoidea'
- 'Plesiofelis belongs to Borhyaenidae'
- 'Plesiolestes belongs to Palaechthonidae'
- 'Plesiomeryx belongs to Cainotheriinae'
- 'Plesiosminthus belongs to Zapodidae'
- 'Plesiosorex belongs to Plesiosoricidae'
- 'Plesiosoricidae belongs to Soricomorpha'
- 'Plesispermophilus belongs to Allomyidae'
- 'Pleurolicus belongs to Geomyidae'
- 'Plicodontinia belongs to Iniidae'
- 'Plioctomys belongs to Cricetidae'
- 'Pliodolichotis belongs to Dolichotinae'
- 'Pliogeomys belongs to Geomyidae'
- 'Pliolagus belongs to Leporidae'
- 'Pliolemmus belongs to Cricetidae'
- 'Pliolestes belongs to Caenolestidae'
- 'Pliomys belongs to Cricetidae'
- 'Pliopedia belongs to Dusignathina'
- 'Pliopentalagus belongs to Leporidae'
- 'Pliopetaurista belongs to Sciuridae'
- 'Pliopetes belongs to Sciuridae'
- 'Pliophenacomys belongs to Cricetidae'
- 'Pliophoca belongs to Monachina'
- 'Pliopithecus belongs to Pliopithecidae'
- 'Pliopontos belongs to Pontoporiinae'
- 'Pliopotamys belongs to Cricetidae'
- 'Plioprion belongs to Paulchoffatiidae'
- 'Pliosaccomys belongs to Geomyidae'
- 'Pliosciuropterus belongs to Sciuridae'
- 'Plioselevinia belongs to Seleviniidae'
- 'Pliospalax belongs to Cricetidae'
- 'Pliotomodon belongs to Cricetidae'
- 'Pliozapus belongs to Zapodidae'
- 'Plohophoroides belongs to Plohophorini'
- 'Plohophorops belongs to Plohophorini'
- 'Plohophorus belongs to Plohophorini'
- 'Poamys belongs to Cricetidae'
- 'Podomys belongs to Cricetidae'
- 'Pollicata is a subjective synonym of Marsupialia'
- 'Polydolopidae belongs to Caenolestoidea'
- 'Polydolopoidea belongs to Paucituberculata'
- 'Polydolops belongs to Polydolopidae'
- 'Pomatodelphis belongs to Acrodelphinidae'
- 'Pomonomys belongs to Diamantomyidae'
- 'Pondaungia belongs to Anthropoidea'
- 'Pongo belongs to Pongidae'
- 'Pontistes belongs to Pontoporiinae'
- 'Pontobasileus belongs to Archaeoceti'
- 'Pontogeneus belongs to Dorudontinae'
- 'Pontoleo is a subjective synonym of Otaria'
- 'Pontoleon is a subjective synonym of Pontolis'
- 'Pontolis belongs to Dusignathina'
- 'Pontophoca belongs to Phocini'
- 'Pontoporia belongs to Pontoporiinae'
- 'Pontoporiidae belongs to Delphinoidea'
- 'Pontoporiinae belongs to Pontoporiidae'
- 'Pontotatus is a subjective synonym of Propraopus'
- 'Posteutatus is a subjective synonym of Utaetus'
- 'Potamarchus belongs to Dinomyidae'
- 'Potamochoerini belongs to Suinae'
- 'Potamochoeroides belongs to Phacochoerini'
- 'Potamochoerus belongs to Potamochoerini'
- 'Potamotelses belongs to Potamotelsidae'
- 'Potamotelsidae belongs to Trituberculata'
- 'Potorous belongs to Macropodidae'
- 'Praearmantomys belongs to Gliridae'
- 'Praecodens belongs to Hyaenodontidae'
- 'Praekogia belongs to Kogiinae'
- 'Praepusa belongs to Phocini'
- 'Praesynaptomys belongs to Cricetidae'
- 'Praolestes belongs to Leptictida'
- 'Pratilepus belongs to Leporidae'
- 'Predicrostonyx belongs to Cricetidae'
- 'Premnoides belongs to Palaechthonidae'
- 'Prepidolops belongs to Polydolopidae'
- 'Presbymys belongs to Protoptychidae'
- 'Presbytis belongs to Cercopithecidae'
- 'Primelephas belongs to Elephantini'
- 'Priodontes belongs to Priodontini'
- 'Priodontini belongs to Tolypeutinae'
- 'Prioinia is corrected as Proinia and belongs to Iniidae'
- 'Prionessus belongs to Taeniolabididae'
- 'Prionodelphis belongs to Delphinoidea'
- 'Prionotemnus belongs to Macropodidae'
- 'Priscophyseter belongs to Physeterinae'
- 'Pristinocetus is a subjective synonym of Lissodelphis'
- 'Pristiphoca belongs to Monachina'
- 'Proalactaga belongs to Zapodidae'
- 'Proargyrolagus belongs to Argyrolagidae'
- 'Proborhyaena belongs to Borhyaenidae'
- 'Proboscidea was reranked as a unranked clade and belongs to Behemota'
- 'Probrachyodus belongs to Anthracotheriidae'
- 'Procaenotherium belongs to Cainotheriinae'
- 'Procaprolagus belongs to Leporidae'
- 'Procardiatherium belongs to Hydrochoeridae'
- 'Procardiomys belongs to Caviidae'
- 'Procastoroides belongs to Castoridae'
- 'Procerberus belongs to Cimolestidae'
- 'Proceromys belongs to Muridae'
- 'Prochetodon belongs to Ptilodontidae'
- 'Procladosictis belongs to Borhyaenidae'
- 'Proconsul belongs to Pongidae'
- 'Procoptodon belongs to Macropodidae'
- 'Procynocephalus belongs to Cercopithecidae'
- 'Prodaedicurus belongs to Doedicurinae'
- 'Prodeinotherium belongs to Deinotheriidae'
- 'Prodiacodon belongs to Leptictidae'
- 'Prodissopsalis belongs to Hyaenodontidae'
- 'Prodolichotis belongs to Caviidae'
- 'Proeuphractus belongs to Euphractini'
- 'Proeutatus belongs to Eutatini'
- 'Progalago belongs to Lorisidae'
- 'Progarzonia belongs to Marsupialia'
- 'Progonomys belongs to Muridae'
- 'Proheliophobius belongs to Bathyergidae'
- 'Proheteromys belongs to Heteromyidae'
- 'Prohylobates belongs to Cercopithecidae'
- 'Prolaena belongs to Hyaenodontidae'
- 'Prolagostomus belongs to Chinchillidae'
- 'Prolapsus belongs to Protrogomorpha'
- 'Prolipotes belongs to Lipotidae'
- 'Promimomys belongs to Cricetidae'
- 'Prominatherium belongs to Anthracotheriidae'
- 'Promioclaenus belongs to Mioclaenidae'
- 'Promops belongs to Molossinae'
- 'Promylagaulus belongs to Mylagaulidae'
- 'Pronasilio belongs to Macroscelididae'
- 'Proneofiber belongs to Cricetidae'
- 'Pronothodectes belongs to Plesiadapidae'
- 'Pronotolagus belongs to Leporidae'
- 'Pronycticebus belongs to Adapidae'
- 'Propachynolophus belongs to Palaeotheriidae'
- 'Propalaeohoplophorus is a misspelling of Propalaehoplophorus' according to Castellanos 1932
- 'Propalaehoplophorus belongs to Propalaehoplophorinae'
- 'Propalaeocastor belongs to Castoridae'
- 'Propalaeosinopa belongs to Pantolestidae'
- 'Propanochthus belongs to Panochthini'
- 'Propediolagus belongs to Caviidae'
- 'Properiptychus belongs to Monachina'
- 'Prophoca belongs to Phocinae'
- 'Prophyseter belongs to Physeterinae'
- 'Propleopus belongs to Macropodidae'
- 'Propliomys belongs to Cricetidae'
- 'Propliophenacomys belongs to Cricetidae'
- 'Propliopithecus belongs to Pliopithecidae'
- 'Propotamochoerus belongs to Potamochoerini'
- 'Propraopus belongs to Dasypodini'
- 'Propterodon belongs to Hyaenodontidae'
- 'Propyrotherium belongs to Pyrotheriidae'
- 'Prorosmarus belongs to Odobenina'
- 'Prosigmodon belongs to Cricetidae'
- 'Prosomys belongs to Cricetidae'
- 'Prospalax belongs to Cricetidae'
- 'Prospaniomys belongs to Myocastorinae'
- 'Prosqualodon belongs to Squalodontidae'
- 'Prostegotherium belongs to Stegotheriini'
- 'Prosthennops belongs to Tayassuinae'
- 'Protabrocoma belongs to Abrocomidae'
- 'Protacaremys belongs to Erethizontidae'
- 'Protadelomys belongs to Theridomyidae'
- 'Protadelphomys belongs to Eumysopinae'
- 'Protadjidaumo belongs to Eomyidae'
- 'Protagriochoerus is a subjective synonym of Protoreodon'
- 'Protalactaga belongs to Cricetidae'
- 'Protalphadon belongs to Didelphidae'
- 'Protanancina belongs to Amebelodontini'
- 'Protanancus belongs to Protanancina'
- 'Protarsomys belongs to Afrocricetodontinae'
- 'Protatera belongs to Cricetidae'
- 'Protelicomys is a subjective synonym of Tetrastylus'
- 'Protelidae is a subjective synonym of Hyaenidae'
- 'Protelotherium is a subjective synonym of Achaenodon'
- 'Protemnodon belongs to Macropodidae'
- 'Protentomodon belongs to Cimolestidae'
- 'Proterotheriinae belongs to Proterotheriidae'
- 'Prothryptacodon belongs to Arctocyonidae'
- 'Prothylacynus belongs to Borhyaenidae'
- 'Proticia belongs to Pyrotheriidae'
- 'Protictops belongs to Geolabididae'
- 'Protoadapis belongs to Adapidae'
- 'Probalaena is a nomen dubium'
- 'Protobalaena is a subjective synonym of Rhegnopsis'
- 'Protobradydae [misspelled as Protobradidae] belongs to Cingulata'
- 'Protobradys belongs to Protobradidae'
- 'Protocetidae belongs to Archaeoceti'
- 'Protocetinae belongs to Protocetidae'
- 'Protocetus belongs to Protocetinae'
- 'Protochoerus is a subjective synonym of Platygonus'
- 'Protodelphinus belongs to Autoceta'
- 'Protodichobune belongs to Diacodexinae'
- 'Protoglyptodon belongs to Palaehoplophorini'
- 'Protohydrochoerus belongs to Hydrochoeridae'
- 'Protolabididae is a subjective synonym of Camelidae'
- 'Protomegamys is a subjective synonym of Eumegamys'
- 'Protophiomys belongs to Theridomyidae'
- 'Protophocaena belongs to Delphinoidea'
- 'Protoptychidae belongs to Castorimorpha'
- 'Protoptychus belongs to Protoptychidae'
- 'Protoreodon belongs to Agriochoeridae'
- 'Protosciurus belongs to Sciuridae'
- 'Protoselene belongs to Mioclaenidae'
- 'Protospermophilus belongs to Sciuridae'
- 'Protosteiromys belongs to Erethizontidae'
- 'Prototaria belongs to Odobenini'
- 'Prototomus belongs to Hyaenodontidae'
- 'Prototomys belongs to Cricetidae'
- 'Protozapus belongs to Zapodidae'
- 'Protoziphius is corrected as Proroziphius and belongs to Hyperoodontidae'
- 'Protypotheroides belongs to Macroscelididae'
- 'Proviverra belongs to Hyaenodontidae'
- 'Proviverroides belongs to Hyaenodontidae'
- 'Prozaedius is corrected as Prozaedyus and belongs to Euphractini'
- 'Psalodon belongs to Plagiaulacidae'
- 'Pseudadjidaumo belongs to Eomyidae'
- 'Pseudamphimeryx belongs to Amphimerycidae'
- 'Pseudaplodon belongs to Aplodontidae'
- 'Pseudeutatus belongs to Eutatini'
- 'Pseudhalmarhiphus belongs to Caenolestidae'
- 'Pseudobolodon belongs to Paulchoffatiidae'
- 'Pseudocheirus belongs to Petauridae'
- 'Pseudochirops belongs to Petauridae'
- 'Pseudocyclopidius belongs to Leptaucheniini'
- 'Pseudocylindrodon belongs to Cylindrodontidae'
- 'Pseudodryomys belongs to Gliridae'
- 'Pseudoeuryurus belongs to Palaehoplophorini'
- 'Pseudokoala belongs to Petauridae'
- 'Pseudoloris belongs to Omomyidae'
- 'Pseudolycopsis belongs to Borhyaenidae'
- 'Pseudomeriones belongs to Cricetidae'
- 'Pseudoneothoracophorus belongs to Neothoracophorini'
- 'Pseudonotictis belongs to Borhyaenidae'
- 'Pseudopalaeocastor belongs to Castoridae'
- 'Pseudoparamys belongs to Protrogomorpha'
- 'Pseudoplataeomys belongs to Octodontidae'
- 'Pseudoplohophorus belongs to Plohophorini'
- 'Pseudorca belongs to Orcininae'
- 'Pseudorhynchocyon belongs to Pseudorhynchocyoninae'
- 'Pseudorhynchocyoninae belongs to Leptictidae'
- 'Pseudorophodon is a subjective synonym of Palaeopeltis'
- 'Pseudosciurinae belongs to Theridomyidae'
- 'Pseudosciurus belongs to Theridomyidae'
- 'Pseudostegotherium belongs to Stegotheriini'
- 'Pseudotetonius belongs to Omomyidae'
- 'Pseudotheridomys belongs to Eomyidae'
- 'Pseudothylacynus belongs to Borhyaenidae'
- 'Pseudotomus belongs to Ischyromyidae'
- 'Pseudotrimylus belongs to Soricidae'
- 'Pterodon belongs to Hyaenodontidae'
- 'Pteronarctos belongs to Phocoidea'
- 'Pterospalax belongs to Cricetidae'
- 'Ptilodontidae belongs to Ptilodontoidea'
- 'Ptilodontoidea belongs to Multituberculata'
- 'Ptilodus belongs to Ptilodontidae'
- 'Ptolemaia belongs to Ptolemaiidae'
- 'Ptolemaiidae belongs to Pantolesta'
- 'Ptyssophorus belongs to Cricetidae'
- 'Puertoricomys belongs to Heteropsomyinae'
- 'Pugiodens belongs to Paroxyclaenidae'
- 'Pulverflumen belongs to Paromomyidae'
- 'Purgatoriidae belongs to Paromomyoidea'
- 'Purgatorius belongs to Purgatoriidae'
- 'Purperia belongs to Notohippidae'
- 'Pygathrix belongs to Cercopithecidae'
- 'Pyramios belongs to Diprotodontidae'
- 'Pyrotheria belongs to Meridiungulata'
- 'Pyrotherium belongs to Pyrotheriidae'
- 'Qarunavus belongs to Ptolemaiidae'
- 'Quadratomus belongs to Ischyromyidae'
- 'Quadripedes is an invalid subgroup of Eutheria'
- 'Quercymys belongs to Rodentia'
- 'Quercytherium belongs to Hyaenodontidae'
- 'Raemeotherium belongs to Diprotodontidae'
- 'Ramsayia belongs to Vombatidae'
- 'Raoella belongs to Raoellidae'
- 'Raoellidae belongs to Suiformes'
- 'Rapamys belongs to Ischyromyidae'
- 'Rattus belongs to Muridae'
- 'Ratufa belongs to Sciuridae'
- 'Ravenictis belongs to Cimolesta'
- 'Reithrodon belongs to Cricetidae'
- 'Reithrodontomys belongs to Cricetidae'
- 'Reithroparamyidae belongs to Sciuroidea'
- 'Reithroparamys belongs to Reithroparamyidae'
- 'Remingtonocetidae belongs to Archaeoceti'
- 'Remingtonocetus belongs to Remingtonocetidae'
- 'Remys belongs to Theridomyidae'
- 'Repomys belongs to Cricetidae'
- 'Rhabdomys belongs to Muridae'
- 'Rhabdosteidae belongs to Squalodontoidea'
- 'Rhabdosteus belongs to Rhabdosteidae'
- 'Rhagapodemus belongs to Muridae'
- 'Rhagatherium belongs to Haplobunodontidae'
- 'Rhagomys belongs to Muridae'
- 'Rhegnopsis belongs to Cetotheriidae'
- 'Rhinocricetus belongs to Cricetidae'
- 'Rhizomyoides belongs to Rhizomyidae'
- 'Rhizomys belongs to Rhizomyidae'
- 'Rhizophascolonus belongs to Vombatidae'
- 'Rhizospalax belongs to Cricetidae'
- 'Rhodanomys belongs to Eomyidae'
- 'Rhynchocyon belongs to Macroscelididae'
- 'Rhynchotheriinae belongs to Gomphotheriidae'
- 'Rhynchotheriini belongs to Rhynchotheriinae'
- 'Rhynchotherium belongs to Rhynchotheriini'
- 'Rhytisodon is a subjective synonym of Squalodon'
- 'Ringueletia belongs to Eutatini'
- 'Ritteneria belongs to Eomyidae'
- 'Robiaciinae belongs to Anoplotheriidae'
- 'Robiacina belongs to Robiaciinae'
- 'Robiatherium belongs to Anoplotheriinae'
- 'Rodhocetus belongs to Protocetidae'
- 'Romanocastor belongs to Castoridae'
- 'Ronquillomys belongs to Eomyidae'
- 'Rooneyia belongs to Omomyidae'
- 'Rosendolops belongs to Polydolopoidea'
- 'Rosmarus is a subjective synonym of Odobenus'
- 'Rudiomys belongs to Allomyidae'
- 'Ruscinomys belongs to Cricetidae'
- 'Rusconia is a subjective synonym of Eumegamys'
- 'Russellagus belongs to Ochotonidae'
- 'Russellites belongs to Paroxyclaenidae'
- 'Saccostomus belongs to Muridae'
- 'Sachalinocetus belongs to Squalodontidae'
- 'Saghacetus belongs to Dorudontinae'
- 'Sagmatias is a subjective synonym of Lagenorhynchus'
- 'Saidomys belongs to Muridae'
- 'Salientia is a subjective synonym of Marsupialia'
- 'Sallamys belongs to Eumysopinae'
- 'Salumiphocaena belongs to Phocoenoidinae'
- 'Sanctimus belongs to Florentiamyidae'
- 'Sanitheriidae belongs to Suoidea'
- 'Sanitherium belongs to Sanitheriidae'
- 'Sarcophilus belongs to Dasyuridae'
- 'Sarmatodelphis belongs to Kentriodontinae'
- 'Saturninia gracilis belongs to Saturninia' according to Stehlin 1940
- 'Saurocetus belongs to Squalodontidae'
- 'Saurodelphis belongs to Iniidae'
- 'Saxonella belongs to Plesiadapidae'
- 'Sayimys belongs to Thryonomyidae'
- 'Saykanomys belongs to Ctenodactylidae'
- 'Scaldicetus belongs to Hoplocetinae'
- 'Scapanoscapter belongs to Talpidae'
- 'Scaphokogia belongs to Kogiinae'
- 'Schaubeumys belongs to Zapodidae'
- 'Schistomys belongs to Eocardiidae'
- 'Schistopleurum is a subjective synonym of Glyptodon'
- 'Schizochoerini belongs to Doliochoerinae'
- 'Schizochoerus belongs to Schizochoerini'
- 'Schizodelphis belongs to Acrodelphinidae'
- 'Schizophagus belongs to Hyaenodontidae'
- 'Schoinobates belongs to Petauridae'
- 'Sciamys belongs to Octodontidae'
- 'Sciuravus belongs to Sciuravidae'
- 'Sciurion belongs to Sciuridae'
- 'Sciurodon belongs to Aplodontidae'
- 'Sciuroides belongs to Theridomyidae'
- 'Sciuromys belongs to Theridomyidae'
- 'Sciuropterus belongs to Sciuridae'
- 'Sciurotamias belongs to Sciuridae'
- 'Sciurus belongs to Sciuridae'
- 'Sciurus (Prosciurus) was reranked as Prosciurus and belongs to Allomyidae'
- 'Sclerocalyptini is an objective synonym of Hoplophorini'
- 'Sclerocalyptus is an objective synonym of Hoplophorus'
- 'Scleromys belongs to Dasyproctidae'
- 'Scotaeumys belongs to Chinchillidae'
- 'Scotamys belongs to Chinchillidae'
- 'Scottimus belongs to Cricetidae'
- 'Selenogonus is a subjective synonym of Platygonus'
- 'Selenogonus narinoensis is recombined as Platygonus narinoensis'
- 'Selenomys belongs to Aplodontidae'
- 'Serbelodon belongs to Amebelodontina'
- 'Sespemys belongs to Cylindrodontidae'
- 'Sespiini belongs to Leptaucheniinae'
- 'Setonix belongs to Macropodidae'
- 'Seumadia belongs to Polydolopidae'
- 'Shamolagus belongs to Lagomorpha'
- 'Shecenia belongs to Trigonostylopidae'
- 'Shoshonius belongs to Omomyidae'
- 'Siamotherium belongs to Anthracotheriidae'
- 'Sicista belongs to Zapodidae'
- 'Sigmodon belongs to Cricetidae'
- 'Simia (Cercopithecus) was reranked as Cercopithecus and belongs to Cercopithecidae'
- 'Simiacritomys belongs to Zapodidae'
- 'Simiidae is a subjective synonym of Pongidae'
- 'Similisciurus belongs to Sciuridae'
- 'Simimys belongs to Simimyidae'
- 'Simonimys belongs to Kenyamyidae'
- 'Simplimus belongs to Dinomyidae'
- 'Simpsonlemur belongs to Paromomyidae'
- 'Simpsonodon belongs to Eupantotheria'
- 'Simpsonodus is a subjective synonym of Diacodexis'
- 'Sinanodelphis belongs to Autoceta'
- 'Sinclairella belongs to Apatemyidae'
- 'Sinocastor belongs to Castoridae'
- 'Sinohyus belongs to Hippohyini'
- 'Sinomastodon belongs to Rhynchotheriinae'
- 'Sinonyx belongs to Mesonychidae'
- 'Sinopa belongs to Hyaenodontidae'
- 'Sipalocyon belongs to Borhyaenidae'
- 'Siphonocetus belongs to Mysticeti'
- 'Sivacanthion belongs to Hystricidae'
- 'Sivachoerus belongs to Tetraconodontinae'
- 'Sivahyus belongs to Hippohyini'
- 'Sivameryx belongs to Anthracotheriidae'
- 'Sivapithecus belongs to Pongidae'
- 'Sivapterodon is a subjective synonym of Hyainailouros'
- 'Slaughteria belongs to Pappotheriidae'
- 'Sloanbaatar belongs to Sloanbaataridae'
- 'Sloanbaataridae belongs to Taeniolabidoidea'
- 'Smilodectes belongs to Adapidae'
- 'Smilodontidion is a subjective synonym of Smilodon'
- 'Smilodontidion riggii is recombined as Smilodon riggii'
- 'Sminthoides belongs to Dipodidae'
- 'Sminthopsis belongs to Dasyuridae'
- 'Sminthozapus belongs to Zapodidae'
- 'Soricomorpha belongs to Lipotyphla'
- 'Sotalia belongs to Cephalorhynchinae'
- 'Sousa belongs to Cephalorhynchinae'
- 'Spalacidae is a subjective synonym of Muridae'
- 'Spalacotheridium belongs to Spalacotheriidae'
- 'Spalacotheriidae belongs to Symmetrodonta'
- 'Spalacotheroides belongs to Spalacotheriidae'
- 'Spalax belongs to Cricetidae'
- 'Spaniella belongs to Paroxyclaenidae'
- 'Spaniomys belongs to Echimyidae'
- 'Spanocricetodon belongs to Cricetidae'
- 'Spanoxyodon belongs to Arctocyonidae'
- 'Sparassocynidae belongs to Didelphimorphia'
- 'Spermophilinus belongs to Sciuridae'
- 'Spermophilus belongs to Sciuridae'
- 'Sphacorhysis belongs to Omomyidae'
- 'Sphenopsalis belongs to Taeniolabididae'
- 'Spurimus belongs to Allomyidae'
- 'Squalodelphidae is a subjective synonym of Hyperoodontidae'
- 'Squalodon belongs to Squalodontidae'
- 'Squalodontidae belongs to Squalodontoidea'
- 'Squalodontoidea belongs to Autoceta'
- 'Squaloziphius belongs to Hyperoodontidae'
- 'Squamata is a subjective synonym of Pholidota'
- 'Stachomys belongs to Cricetidae'
- 'Stagodontidae belongs to Didelphoidea'
- 'Steatomys belongs to Muridae'
- 'Stegodibelodon belongs to Elephantinae'
- 'Stegodon belongs to Stegodontinae'
- 'Stegodontinae belongs to Elephantidae'
- 'Stegolophodon belongs to Stegodontinae'
- 'Stegomastodon belongs to Cuvieroniini'
- 'Stegosimpsonia belongs to Stegotheriini'
- 'Stegotetrabelodon belongs to Elephantinae'
- 'Stegotherium belongs to Stegotheriini'
- 'Stehlinella belongs to Apatemyidae'
- 'Steinius belongs to Omomyidae'
- 'Steiromys belongs to Erethizontidae'
- 'Stelocyon belongs to Triisodontidae'
- 'Stemmatopis is a subjective synonym of Cystophora'
- 'Stemmatops is a subjective synonym of Cystophora'
- 'Stemmatopus is a subjective synonym of Cystophora'
- 'Steneofiber belongs to Castoridae'
- 'Steno belongs to Delphininae'
- 'Steno (Stenella) was reranked as Stenella and belongs to Delphininae'
- 'Stenodelphis is a subjective synonym of Pontoporia'
- 'Stenodon is a subjective synonym of Cetotheriopsis'
- 'Stenotatus belongs to Eutatini'
- 'Stephanoceras is replaced by Stephanocemas' according to Colbert 1936
- 'Stephanomys belongs to Muridae'
- 'Stereodelphis belongs to Autoceta'
- 'Sternbergia is a subjective synonym of Carolopaulacoutoia'
- 'Sthenmerus belongs to Diprotodontidae'
- 'Sthenurus belongs to Macropodidae'
- 'Stibarus belongs to Leptochoerinae'
- 'Stichomys belongs to Echimyidae'
- 'Stilotherium belongs to Caenolestidae'
- 'Stilpnodon belongs to Gypsonictopidae'
- 'Stirtonia belongs to Atelidae'
- 'Stockia belongs to Omomyidae'
- 'Strabosodon belongs to Mylodontinae'
- 'Strigorhysis belongs to Omomyidae'
- 'Stromaphoropsis belongs to Hoplophorini'
- 'Stromaphorus belongs to Hoplophorini'
- 'Stromatherium belongs to Glyptodontini'
- 'Strophostephanos belongs to Myocastorinae'
- 'Stygimys belongs to Eucosmodontidae'
- 'Stylinodontidae belongs to Taeniodonta'
- 'Stylochoerus belongs to Phacochoerini'
- 'Stylocynus belongs to Borhyaenidae'
- 'Subparictis is a subjective synonym of Parictis'
- 'Suevosciurus belongs to Theridomyidae'
- 'Suidae belongs to Suoidea'
- 'Suiformes belongs to Artiodactyla'
- 'Suinae belongs to Suidae'
- 'Suini belongs to Suinae'
- 'Sulakocetus belongs to Squalodontidae'
- 'Suoidea belongs to Suiformes'
- 'Sus belongs to Suini'
- 'Swaindelphys belongs to Didelphidae'
- 'Sylvilagus belongs to Leporidae'
- 'Symmetrodontoides belongs to Spalacotheriidae'
- 'Symmetrodontomys belongs to Cricetidae'
- 'Synaphodus belongs to Dichobunini'
- 'Synapsida belongs to Amniota'
- 'Synaptodon belongs to Macropodidae'
- 'Synaptomys belongs to Cricetidae'
- 'Synoplotherium belongs to Mesonychidae'
- 'Tachylagus belongs to Leporidae'
- 'Tachyoryctoides belongs to Rhizomyidae'
- 'Taeniodonta was reranked as a suborder and belongs to Cimolesta'
- 'Taeniolabididae belongs to Taeniolabidoidea'
- 'Taeniolabidoidea belongs to Multituberculata'
- 'Taeniolabis belongs to Taeniolabididae'
- 'Takracetus belongs to Protocetidae'
- 'Talpini was reranked as the family Talpidae and belongs to Talpoidea'
- 'Talpoidea belongs to Erinaceomorpha'
- 'Tamias belongs to Sciuridae'
- 'Tamiasciurus belongs to Sciuridae'
- 'Tamquammys belongs to Ctenodactylidae'
- 'Tangaroasaurus belongs to Squalodontoidea'
- 'Tapirulus belongs to Dacrytheriidae'
- 'Tapochoerus belongs to Diacodexinae'
- 'Tapomys belongs to Ischyromyidae'
- 'Tardigrada is a subjective synonym of Phyllophaga'
- 'Tardontia belongs to Aplodontidae'
- 'Tarka belongs to Plagiomenidae'
- 'Tarnomys belongs to Theridomyidae'
- 'Tarsipedidae belongs to Marsupialia'
- 'Tasmacetus belongs to Hyperoodontidae'
- 'Tataromys belongs to Ctenodactylidae'
- 'Tatera belongs to Cricetidae'
- 'Tathiodon belongs to Paurodontidae'
- 'Taucanamo belongs to Doliochoerini'
- 'Taxymys belongs to Sciuravidae'
- 'Tayassu belongs to Tayassuinae'
- 'Tayassuidae belongs to Suoidea'
- 'Tayassuinae belongs to Tayassuidae'
- 'Teilhardina belongs to Omomyidae'
- 'Teisseiria belongs to Plohophorini'
- 'Telacodon belongs to Trituberculata'
- 'Telicomys belongs to Dinomyidae'
- 'Telmatodon belongs to Anthracotheriidae'
- 'Tempestia belongs to Gliridae'
- 'Tenudomys belongs to Geomyidae'
- 'Teratodon belongs to Hyaenodontidae'
- 'Terrarboreus belongs to Ctenodactylidae'
- 'Terricola belongs to Cricetidae'
- 'Testouromys belongs to Ctenodactylidae'
- 'Tetonius belongs to Omomyidae'
- 'Tetraconodon belongs to Tetraconodontinae'
- 'Tetraconodontinae belongs to Suidae'
- 'Tetralophodon belongs to Elephantidae'
- 'Tetralophodon (Morrillia) was reranked as Morrillia and belongs to Elephantidae'
- 'Tetrastylopsis is a subjective synonym of Tetrastylus'
- 'Tetrastylus belongs to Eumegamyinae'
- 'Texodon belongs to Homacodontini'
- 'Texomys belongs to Protrogomorpha'
- 'Thalassocetus belongs to Physeterinae'
- 'Thalassoleon belongs to Otariidae'
- 'Thalerimys belongs to Theridomyidae'
- 'Thallomys belongs to Muridae'
- 'Thaumastognathus belongs to Anthracotheriidae'
- 'Thelysia belongs to Pantolestidae'
- 'Thereutherium belongs to Hyaenodontidae'
- 'Theridomys belongs to Theridomyidae'
- 'Theridomys (Paradelomys) belongs to Theridomys'
- 'Theropithecus belongs to Cercopithecidae'
- 'Thinocetus belongs to Cetotheriidae'
- 'Thinohyus belongs to Tayassuinae'
- 'Thinotherium is a subjective synonym of Helohyus'
- 'Thisbemys belongs to Ischyromyidae'
- 'Thomasia belongs to Haramiyidae'
- 'Thomomys belongs to Geomyidae'
- 'Thoracophorus is a subjective synonym of Neothoracophorus'
- 'Thryonomys belongs to Thryonomyidae'
- 'Thryptacodon belongs to Arctocyonidae'
- 'Thylacaelurus belongs to Dermoptera'
- 'Thylacinidae belongs to Dasyuroidea'
- 'Thylacinus belongs to Thylacinidae'
- 'Thylacis belongs to Peramelidae'
- 'Thylacodon belongs to Didelphidae'
- 'Thylacoleo belongs to Thylacoleonidae'
- 'Thylacoleonidae belongs to Phalangeroidea'
- 'Thylacomorphus is a nomen oblitum'
- 'Thylacomyinae is corrected as Thylacomyidae and belongs to Perameloidea'
- 'Thylacosmilidae belongs to Didelphoidea'
- 'Thylacosmilus belongs to Thylacosmilidae'
- 'Thylatheridium belongs to Monodelphini'
- 'Thylogale belongs to Macropodidae'
- 'Thylophorops belongs to Didelphini'
- 'Tillodontia was reranked as a suborder and belongs to Cimolesta'
- 'Tillomys belongs to Sciuravidae'
- 'Tillotheriidae belongs to Tillodonta'
- 'Tinimomys belongs to Micromomyidae'
- 'Tinodontidae belongs to Symmetrodonta'
- 'Tiphyocetus belongs to Cetotheriidae'
- 'Titanoideidae belongs to Pantolambdoidea'
- 'Tolypeutes belongs to Tolypeutini'
- 'Tolypeutinae belongs to Dasypodidae'
- 'Tolypeutini belongs to Tolypeutinae'
- 'Tomodus is a subjective synonym of Eutomodus'
- 'Torrejonia belongs to Palaechthonidae'
- 'Trabalia belongs to Hoplophorini'
- 'Trachycalyptoides belongs to Lomaphorini'
- 'Trachycalyptus belongs to Hoplophorini'
- 'Tramyocastor belongs to Capromyidae'
- 'Tregomys is a subjective synonym of Copemys'
- 'Tremacebus belongs to Atelidae'
- 'Treposciurus belongs to Theridomyidae'
- 'Tretosphys belongs to Autoceta'
- 'Tretulias belongs to Mysticeti'
- 'Trichechidae is a subjective synonym of Odobenidae'
- 'Trichechus is an objective synonym of Odobenus'
- 'Trichecodon belongs to Odobenina'
- 'Trichosurus belongs to Phalangeridae'
- 'Tricuspiodon belongs to Tricuspiodontidae'
- 'Trigonolophodon belongs to Homalodotheriidae'
- 'Trigonomys belongs to Aplodontidae'
- 'Trigonostylopidae belongs to Astrapotheria'
- 'Triisodon belongs to Triisodontidae'
- 'Triisodontidae belongs to Acreodi'
- 'Trilaccogaulus belongs to Mylagaulidae'
- 'Trilobophorus belongs to Hippopotamidae'
- 'Trilophomys belongs to Cricetidae'
- 'Trinititherium belongs to Kermackiidae'
- 'Trirhizodon is a subjective synonym of Squalodon'
- 'Trischizolagus belongs to Leporidae'
- 'Tritemnodon belongs to Hyaenodontidae'
- 'Trogolemur belongs to Omomyidae'
- 'Trogontherium belongs to Castoridae'
- 'Troposodon belongs to Macropodidae'
- 'Tsaganomys belongs to Tsaganomyinae'
- 'Tsinlingomys belongs to Ctenodactylidae'
- 'Tugrigbaatar belongs to Eucosmodontidae'
- 'Tupaia belongs to Tupaiidae'
- 'Turgidodon belongs to Didelphidae'
- 'Turkomys belongs to Cricetidae'
- 'Tursio is a subjective synonym of Lissodelphis'
- 'Tursiops belongs to Delphininae'
- 'Tyrannomys belongs to Zapodidae'
- 'Tyrrhenicola belongs to Cricetidae'
- 'Uintalacus belongs to Omomyidae'
- 'Uintanius belongs to Omomyidae'
- 'Uintasorex belongs to Microsyopidae'
- 'Ulausuodon belongs to Anthracotheriidae'
- 'Ulias belongs to Mysticeti'
- 'Uncamentodon is an objective synonym of Microcetus'
- 'Ungaromys belongs to Cricetidae'
- 'Unuchinia belongs to Apatemyidae'
- 'Uriscus belongs to Reithroparamyidae'
- 'Urotherium belongs to Lomaphorini'
- 'Uruguayurus belongs to Hoplophorinae'
- 'Urumacotherium belongs to Mylodontidae'
- 'Utaetini belongs to Euphractinae'
- 'Utaetus belongs to Utaetini'
- 'Utahia belongs to Omomyidae'
- 'Valenictus belongs to Dusignathina'
- 'Valerimys belongs to Muridae'
- 'Vanderhoofius belongs to Desmostylidae'
- 'Varalphadon belongs to Didelphidae'
- 'Vassallia belongs to Pampatheriidae'
- 'Vasseuromys belongs to Gliridae'
- 'Vetelia belongs to Euphractini'
- 'Veterilepus belongs to Leporidae'
- 'Victoriapithecus belongs to Cercopithecidae'
- 'Viejadjidaumo belongs to Eomyidae'
- 'Villanyia belongs to Arvicolini'
- 'Viridomys belongs to Multituberculata'
- 'Vombatidae belongs to Vombatoidea'
- 'Vombatoidea belongs to Diprotodonta'
- 'Vombatus belongs to Vombatidae'
- 'Vulcanisciurus belongs to Sciuridae'
- 'Wakamatha belongs to Dasyuridae'
- 'Wakiewakie belongs to Macropodidae'
- 'Wallabia belongs to Macropodidae'
- 'Wanglia belongs to Wangliidae'
- 'Wangliidae belongs to Pantodonta'
- 'Washakius belongs to Omomyidae'
- 'Willidewu belongs to Echimyidae'
- 'Wilsoneumys belongs to Cricetidae'
- 'Windhausenia belongs to Macraucheniinae'
- 'Woodomys belongs to Ctenodactylidae'
- 'Worlandia belongs to Plagiomenidae'
- 'Woutersia belongs to Kuehneotheriidae'
- 'Wynyardia belongs to Wynyardiidae'
- 'Wynyardiidae belongs to Vombatoidea'
- 'Wyomomys belongs to Omomyidae'
- 'Wyonycteris belongs to Nyctitheriidae'
- 'Xanclomys belongs to Ptilodontidae'
- 'Xenacodon belongs to Leptictidae'
- 'Xenarthra was reranked as a unranked clade and belongs to Placentalia'
- 'Xenodelphis is a subjective synonym of Gaylordia'
- 'Xenodontomys belongs to Octodontidae'
- 'Xenoglyptodon is a subjective synonym of Glyptotherium'
- 'Xenohystrix belongs to Hystricidae'
- 'Xenorophus belongs to Autoceta'
- 'Xenothrix belongs to Atelidae'
- 'Xerus belongs to Sciuridae'
- 'Xiphuroides belongs to Doedicurinae'
- 'Xylechimys belongs to Adelphomyinae'
- 'Xyronomys belongs to Ptilodontidae'
- 'Yantanglestes belongs to Mesonychidae'
- 'Yaquius belongs to Omomyidae'
- 'Yatkolamys belongs to Cricetidae'
- 'Yindirtemys belongs to Ctenodactylidae'
- 'Yoderimys belongs to Eomyidae'
- 'Youngofiber belongs to Castoridae'
- 'Yunnanochoerus belongs to Palaeochoerinae'
- 'Yuomys belongs to Ctenodactylidae'
- 'Zaedyus belongs to Euphractini'
- 'Zalambdalestes belongs to Zalambdalestidae'
- 'Zalambdalestidae belongs to Anagalida'
- 'Zalophus belongs to Otariinae'
- 'Zamolxifiber belongs to Castoridae'
- 'Zanycteris belongs to Picrodontidae'
- 'Zapus belongs to Zapodidae'
- 'Zarhachis belongs to Platanistidae'
- 'Zegdoumys belongs to Zegdoumyidae'
- 'Zelotomys belongs to Muridae'
- 'Zemiodontomys belongs to Eomyidae'
- 'Zenkerella belongs to Anomaluridae'
- 'Zetamys belongs to Eomyidae'
- 'Zeuglodonta is a subjective synonym of Archaeoceti'
- 'Ziphiidae was reranked as the tribe Ziphiina and belongs to Physeteridae'
- 'Ziphiodelphis belongs to Rhabdosteidae'
- 'Ziphioides belongs to Hyperoodontidae'
- 'Ziphirostrum belongs to Hyperoodontidae'
- 'Ziphius belongs to Hyperoodontidae'
- 'Zramys belongs to Cricetidae'
- 'Zygiocuspis belongs to Trituberculata'
- 'Zygolestes belongs to Monodelphini'
- 'Zygomaturus belongs to Diprotodontidae'
- 'Zygorhiza belongs to Dorudontinae'