Opinions from O. Jaekel 1911
- 'Acanthaspidi belongs to Pterichthyi'
- 'Acanthodi belongs to Acanthodi'
- 'Acanthodii was reranked as the order Acanthodi and belongs to Proostea'
- 'Acanthopterygii was reranked as a order and belongs to Teleostea'
- 'Acanthostomi belongs to Hemispondyla'
- 'Accipitres was reranked as a unranked clade and belongs to Falconiformes'
- 'Achaenodontidae belongs to Suiformes'
- 'Acichelyidae belongs to Chelonii'
- 'Acrania is a subjective synonym of Leptocardia'
- 'Acrodelphidae belongs to Odontoceti'
- 'Adianthidae is corrected as Adiantidae and belongs to Litopterni'
- 'Aetosauria is corrected as Aetosauri and belongs to Loricati'
- 'Aistopoda was reranked as the order Aistopodi and belongs to Microsauria'
- 'Alectromorphae belongs to Neornithes'
- 'Allosaurus fragilis [misspelled as Allosaurus agilis] belongs to Allosaurus'
- 'Amblypoda was reranked as the suborder Amblypodi and belongs to Ungulati'
- 'Amii belongs to Crossopterygii'
- 'Amphibia belongs to Tetrapoda'
- 'Amphichelydia is corrected as Amphichelydii and belongs to Testudinata'
- 'Anacanthini belongs to Teleostea'
- 'Anaspida is corrected as Anaspidi and belongs to Palaeostraci'
- 'Anomaluridae belongs to Sciurognathi'
- 'Anomodontia is corrected as Anomodontii and belongs to Paratheria'
- 'Anoplotheriadae [misspelled as Anoplotheridae] belongs to Ruminantii'
- 'Anosteirinae [misspelled as Anosternidae] belongs to Cryptodiri'
- 'Anseriformes was reranked as a suborder and belongs to Pelargomorphae'
- 'Anthracotheriidae [misspelled as Anthracotheridae] belongs to Suiformes'
- 'Anthropi belongs to Bimani'
- 'Antilocapridae belongs to Ruminantii'
- 'Anuri is corrected as Anura and belongs to Amphibia'
- 'Apodes belongs to Teleostea'
- 'Apternodontidae [misspelled as Apternsdontidae] belongs to Lipotyphla'
- 'Archaeoceti belongs to Cetacei'
- 'Archaeopteryx belongs to Archornithes'
- 'Archaeopteryx lithographica belongs to Archaeopteryx'
- 'Archaeopteryx siemensi is a subjective synonym of Archaeopteryx lithographica'
- 'Archaeornithes is a subjective synonym of Archornithes'
- 'Archaeosauria belongs to Reptilia'
- 'Archaeopteryx macrura is a subjective synonym of Archaeopteryx lithographica'
- 'Archornithes belongs to Aves'
- 'Archosauria is a subjective synonym of Hyperosauria'
- 'Ardeae was reranked as a unranked clade and belongs to Ciconiiformes'
- 'Asterolepidi belongs to Pterichthyi'
- 'Atlantosauridae belongs to Sauropoda'
- 'Atoposaurides is corrected as Atoposauridae and belongs to Crocodili'
- 'Aves belongs to Tetrapoda'
- 'Balaenopteridae belongs to Mystacoceti'
- 'Balanadae is corrected as Balaenidae and belongs to Mystacoceti'
- 'Belodontia was reranked as the suborder Belodonti and belongs to Loricati'
- 'Belonorhynchi belongs to Crossopterygii'
- 'Belonostomi belongs to Crossopterygii'
- 'Bimani belongs to Mesotheria'
- 'Bovidae belongs to Ruminantii'
- 'Bradypidae is corrected as Bradypodidae and belongs to Tardigradi'
- 'Branchiosauria was reranked as the order Branchiosauri and belongs to Hemispondyla'
- 'Brontosauridae belongs to Sauropoda'
- 'Bunolitopternidae belongs to Litopterni'
- 'Camarasauridae [misspelled as Camarosauridae] belongs to Sauropoda'
- 'Camelidae belongs to Ruminantii'
- 'Canidae belongs to Ursocanidi'
- 'Carnivora belongs to Holotheria'
- 'Castoridae belongs to Sciurognathi'
- 'Catarrhini was reranked as the suborder Catarhini and belongs to Simiae'
- 'Cathartidae belongs to Falconiformes'
- 'Catosteomi belongs to Teleostea'
- 'Caudata is a subjective synonym of Urodela'
- 'Caviidae belongs to Hystricognathi'
- 'Centetidae belongs to Lipotyphla'
- 'Centrobati belongs to Selachii'
- 'Cephalaspidi belongs to Goniaspidi'
- 'Cephalochordata is a subjective synonym of Leptocardia'
- 'Ceratodonti belongs to Dipnoa'
- 'Ceratopsidae belongs to Postpubici'
- 'Cervidae belongs to Ruminantii'
- 'Cestraciontes was reranked as the suborder Cestracionti and belongs to Selachii'
- 'Cetacea is corrected as Cetacei and belongs to Holotheria'
- 'Champsosauri belongs to Holosauria'
- 'Charadriiformes was reranked as a suborder and belongs to Alectromorphae'
- 'Chelonii was reranked as a suborder and belongs to Testudinata'
- 'Chelydidae is corrected as Chelyidae and belongs to Pleurodiri'
- 'Chelydridae belongs to Cryptodiri'
- 'Chimaeri belongs to Holocephala'
- 'Chinchillidae belongs to Hystricognathi'
- 'Chiroptera is corrected as Chiropteri and belongs to Mesotheria'
- 'Chlamydophorina was reranked as the family Chlamydophoridae and belongs to Placophori'
- 'Chondrostei was reranked as a subclass and belongs to Hypostomata'
- 'Chrysochloridae belongs to Lipotyphla'
- 'Ciconiae was reranked as a unranked clade and belongs to Ciconiiformes'
- 'Ciconiiformes was reranked as a suborder and belongs to Pelargomorphae'
- 'Cladobatina was reranked as the family Cladobatidae and belongs to Menotyphla'
- 'Coccostei belongs to Placodermata'
- 'Coccostei belongs to Coccostei'
- 'Colymbiformes was reranked as a suborder and belongs to Colymbomorphae'
- 'Colymbomorphae belongs to Neornithes'
- 'Condylarthra was reranked as the suborder Condylarthri and belongs to Ungulati'
- 'Coraciiformes was reranked as a suborder and belongs to Coraciomorphae'
- 'Coraciomorphae belongs to Neornithes'
- 'Coryphodontidae belongs to Amblypodi'
- 'Cotylosauria was reranked as a subclass and belongs to Miosauria'
- 'Crocodilia was reranked as the suborder Crocodili and belongs to Loricati'
- 'Crocodylidae [misspelled as Crocodilidae] belongs to Crocodili'
- 'Crossopterygidae was reranked as the unranked clade Crossopterygii and belongs to Holostea'
- 'Cryptodira is corrected as Cryptodiri and belongs to Testudinata'
- 'Crypturi was reranked as a suborder and belongs to Alectromorphae'
- 'Ctenodactylidae belongs to Sciurognathi'
- 'Cuculiformes was reranked as a suborder and belongs to Coraciomorphae'
- 'Cyclolepidi belongs to Crossopterygii'
- 'Cyclostomata was reranked as a subclass and belongs to Malacostomata'
- 'Dasipidae is corrected as Dasypodidae and belongs to Placophori'
- 'Datheosauri belongs to Cotylosauria'
- 'Delphinidae belongs to Odontoceti'
- 'Dermatemydidae belongs to Cryptodiri'
- 'Dermochelyidae is corrected as Dermochelydidae and belongs to Chelonii'
- 'Dichobunidae belongs to Suiformes'
- 'Dicotylidae belongs to Suiformes'
- 'Dicynodontidae belongs to Anomodontii'
- 'Didelphia was reranked as the suborder Didelphii and belongs to Haplodonti'
- 'Dinocephalia is corrected as Dinocephali and belongs to Therapsidi'
- 'Dinoceratidae belongs to Amblypodi'
- 'Dinosauria is corrected as Dinosauri and belongs to Hyperosauria'
- 'Diplacanthi belongs to Acanthodi'
- 'Diplocerci belongs to Cyclolepidi'
- 'Diplodocidae belongs to Sauropoda'
- 'Dipnoi was reranked as the order Dipnoa and belongs to Crossopterygii'
- 'Diprotodonta was reranked as the order Diprotodonti and belongs to Miotheria'
- 'Dipteri belongs to Dipnoa'
- 'Diungulati belongs to Holotheria'
- 'Drepanaspidi belongs to Goniaspidi'
- 'Dromasauria is corrected as Dromaeosauri and belongs to Therapsidi'
- 'Duplicidentata was reranked as the suborder Duplicidentati and belongs to Rodentii'
- 'Emballonuridae belongs to Microchiroptera'
- 'Emydidae belongs to Cryptodiri'
- 'Endothiodontidae belongs to Anomodontii'
- 'Entelodontidae belongs to Suiformes'
- 'Eotetrapoda belongs to Vertebrata'
- 'Erinaceidae belongs to Lipotyphla'
- 'Eugnathi belongs to Crossopterygii'
- 'Eurhinodelphidae belongs to Odontoceti'
- 'Falconiformes was reranked as a suborder and belongs to Pelargomorphae'
- 'Felidi belongs to Carnivora'
- 'Galeopitheci belongs to Mesotheria'
- 'Galli belongs to Alectromorphae'
- 'Geomyidae belongs to Sciurognathi'
- 'Geosauridae belongs to Crocodili'
- 'Gephyrostegi belongs to Archaeosauria'
- 'Giraffidae belongs to Ruminantii'
- 'Glyptodontidae belongs to Placophori'
- 'Goniaspidi belongs to Palaeostraci'
- 'Goniopholididae [misspelled as Goniopholidae] belongs to Crocodili'
- 'Gravigrada was reranked as the suborder Gravigradi and belongs to Xenarthri'
- 'Gresslyosauridae belongs to Praepubici'
- 'Gresslyosaurus torgeri belongs to Gresslyosaurus'
- 'Gruidae belongs to Gruiformes'
- 'Gruiformes was reranked as a suborder and belongs to Alectromorphae'
- 'Gymnodontes was reranked as a suborder and belongs to Plectognathi'
- 'Gymnophiona belongs to Amphibia'
- 'Hadrosauridae belongs to Postpubici'
- 'Halicoridae belongs to Sirenii'
- 'Haplodonti belongs to Miotheria'
- 'Haplomi belongs to Teleostea'
- 'Haplosauri belongs to Microsauria'
- 'Hemispondyla belongs to Tetrapoda'
- 'Herpestinae was reranked as the family Herpestidae and belongs to Felidi'
- 'Heterocerci belongs to Crossopterygii'
- 'Heteromi belongs to Teleostea'
- 'Heterostei belongs to Coccostei'
- 'Heterostraci was reranked as a order and belongs to Palaeostraci'
- 'Hippopotamidae belongs to Suiformes'
- 'Holocephali is corrected as Holocephala and belongs to Placoidea'
- 'Holoptychii belongs to Cyclolepidi'
- 'Holosauria belongs to Reptilia'
- 'Holostei was reranked as the subclass Holostea and belongs to Teleostomata'
- 'Holotheria belongs to Mammalia'
- 'Homostei belongs to Coccostei'
- 'Hyaenidae belongs to Felidi'
- 'Hylobati belongs to Bimani'
- 'Hyperosauria belongs to Reptilia'
- 'Hypertragulidae belongs to Ruminantii'
- 'Hypospondyli belongs to Cyclostomata'
- 'Hypostomata belongs to Pisces'
- 'Hystricidae belongs to Hystricognathi'
- 'Hystricognathi was reranked as a unranked clade and belongs to Rodentii'
- 'Ichthyornithes was reranked as a suborder and belongs to Colymbomorphae'
- 'Ichthyosauria was reranked as the suborder Ichthyosauri and belongs to Gephyrostegi'
- 'Iguanodon bernissartensis belongs to Iguanodon'
- 'Iguanodontidae belongs to Postpubici'
- 'Insectivora is corrected as Insectivori and belongs to Mesotheria'
- 'Kinosternoidea was reranked as the family Cinosternidae and belongs to Cryptodiri'
- 'Lacertilia was reranked as the order Lacerti and belongs to Lyognathi'
- 'Lagomyidae is a subjective synonym of Ochotonidae'
- 'Lemures was reranked as the suborder Lemuri and belongs to Prosimiae'
- 'Lepidosauria is a subjective synonym of Lyognathi'
- 'Lepidostei belongs to Crossopterygii'
- 'Leporidae belongs to Duplicidentati'
- 'Lepospondyli is a subjective synonym of Microsauria'
- 'Leptictidae belongs to Lipotyphla'
- 'Leptocardia belongs to Malacostomata'
- 'Lipotyphla was reranked as a suborder and belongs to Insectivori'
- 'Litopterna was reranked as the suborder Litopterni and belongs to Ungulati'
- 'Loricata is corrected as Loricati and belongs to Hyperosauria'
- 'Lyognatha was reranked as the order Lyognathi and belongs to Holosauria'
- 'Macraucheniidae [misspelled as Macrauchenidae] belongs to Litopterni'
- 'Macroscelididae [misspelled as Macroscelidae] belongs to Menotyphla'
- 'Malacopteri belongs to Teleostea'
- 'Malacostomata belongs to Pisces'
- 'Mammalia belongs to Tetrapoda'
- 'Manatidae belongs to Sirenii'
- 'Marsipobranchii is a subjective synonym of Cyclostomata'
- 'Megachiroptera belongs to Chiropteri'
- 'Megalosauria was reranked as a unranked clade and belongs to Praepubici'
- 'Meniscotheriidae [misspelled as Meniscotheridae] belongs to Condylarthri'
- 'Menotyphla was reranked as a suborder and belongs to Insectivori'
- 'Merycodontidae belongs to Ruminantii'
- 'Mesodactyli belongs to Ungulati'
- 'Mesosauria is corrected as Mesosauri and belongs to Gephyrostegi'
- 'Mesosuchia is a subjective synonym of Crocodili'
- 'Mesotheria belongs to Mammalia'
- 'Metacheiromyidae [misspelled as Metachiromyidae] belongs to Placophori'
- 'Metriorhynchidae belongs to Crocodili'
- 'Microchiroptera belongs to Chiropteri'
- 'Microsauria was reranked as a subclass and belongs to Miosauria'
- 'Mioclaenidae belongs to Condylarthri'
- 'Miosauria belongs to Tetrapoda'
- 'Miotheria belongs to Mammalia'
- 'Monorhina is a subjective synonym of Cyclostomata'
- 'Monotremata is corrected as Monotremati and belongs to Paratheria'
- 'Mosasauria was reranked as the suborder Mosasauri and belongs to Lyognathi'
- 'Multituberculata belongs to Miotheria'
- 'Mustelidae belongs to Ursocanidi'
- 'Myoxidae belongs to Sciurognathi'
- 'Myrmecophagi belongs to Xenarthri'
- 'Mystacoceti belongs to Cetacei'
- 'Myxini belongs to Cyclostomata'
- 'Naosauri was reranked as a suborder and belongs to Protorosauri'
- 'Natalidae belongs to Chiroptera'
- 'Necrolestidae belongs to Lipotyphla'
- 'Nectridea was reranked as the order Nectridei and belongs to Microsauria'
- 'Neornithes belongs to Aves'
- 'Nothosauria was reranked as the suborder Nothosauri and belongs to Sauropterygii'
- 'Notidani belongs to Selachii'
- 'Notoungulata was reranked as the suborder Notoungulatu and belongs to Ungulati'
- 'Ochotonidae belongs to Duplicidentati'
- 'Octodontidae belongs to Hystricognathi'
- 'Odontoceti belongs to Cetacei'
- 'Odontolcae belongs to Neornithes'
- 'Odontotormae is a subjective synonym of Ichthyornithes'
- 'Onychodonti belongs to Cyclolepidi'
- 'Ophidia was reranked as the suborder Ophidii and belongs to Lyognathi'
- 'Opisthomi belongs to Teleostea'
- 'Oreodontidae belongs to Ruminantii'
- 'Ornithischia is a subjective synonym of Postpubici'
- 'Orthopoda is a subjective synonym of Postpubici'
- 'Ostariophysi was reranked as a order and belongs to Teleostea'
- 'Osteolepidida is corrected as Osteolepidi and belongs to Crossopterygii'
- 'Otariina was reranked as the family Otariidae and belongs to Phocidi'
- 'Oudenodontidae [misspelled as Udenodontidae] belongs to Anomodontii'
- 'Palaeaspidi belongs to Heterostraci'
- 'Palaeospondyli belongs to Cyclostomata'
- 'Palaeosquali belongs to Selachii'
- 'Palaeostraci belongs to Malacostomata'
- 'Pantolambdidae belongs to Amblypodi'
- 'Pantolestidae belongs to Lipotyphla'
- 'Paranthropi belongs to Bimani'
- 'Parasuchia is a subjective synonym of Belodonti'
- 'Paratheria was reranked as a class and belongs to Tetrapoda'
- 'Pareiasauria was reranked as the order Pareiasauri and belongs to Cotylosauria'
- 'Passeres belongs to Coraciomorphae'
- 'Pediculati belongs to Teleostea'
- 'Pelargomorphae belongs to Neornithes'
- 'Pelomedusidae belongs to Pleurodiri'
- 'Pelycosauria is a subjective synonym of Naosauri'
- 'Percesoces was reranked as a order and belongs to Teleostea'
- 'Periptychidae belongs to Amblypodi'
- 'Perissodactyla is a subjective synonym of Mesodactyli'
- 'Petalichthyi belongs to Ptychostei'
- 'Petromyzontes was reranked as a order and belongs to Cyclostomata'
- 'Phenacodontidae belongs to Condylarthri'
- 'Phlyctaenaspi belongs to Ptychostei'
- 'Phocadae is corrected as Phocidae and belongs to Phocidi'
- 'Phocidi belongs to Carnivora'
- 'Phoenicopteri was reranked as a unranked clade and belongs to Ciconiiformes'
- 'Pholidosauridae belongs to Crocodili'
- 'Pholidota belongs to Mesotheria'
- 'Phyllostomidae belongs to Microchiroptera'
- 'Physeteridae belongs to Odontoceti'
- 'Pisces was reranked as a unranked clade and belongs to Eotetrapoda'
- 'Placodermi was reranked as the subclass Placodermata and belongs to Hypostomata'
- 'Placodontia is corrected as Placodonti and belongs to Holosauria'
- 'Placoides was reranked as the subclass Placoidea and belongs to Hypostomata'
- 'Placophori belongs to Xenarthri'
- 'Plagiosterni belongs to Hemispondyla'
- 'Plastomenidae belongs to Trionychii'
- 'Platanistina was reranked as the family Platanistidae and belongs to Odontoceti'
- 'Platyrrhini was reranked as the suborder Platyrhini and belongs to Simiae'
- 'Platysomi belongs to Crossopterygii'
- 'Platysternidae belongs to Cryptodiri'
- 'Plectognathi belongs to Teleostea'
- 'Plesiosauria was reranked as the suborder Plesiosauri and belongs to Sauropterygii'
- 'Pleuraspidotheriidae [misspelled as Pleuraspidotheridae] belongs to Condylarthri'
- 'Pleurodira is corrected as Pleurodiri and belongs to Testudinata'
- 'Polydactyli belongs to Ungulati'
- 'Polyodonti belongs to Chondrostei'
- 'Polyprotodontia is a subjective synonym of Didelphii'
- 'Polypteri was reranked as a order and belongs to Crossopterygii'
- 'Postpubici belongs to Dinosauri'
- 'Potamogalidae belongs to Lipotyphla'
- 'Praepubici belongs to Dinosauri'
- 'Procellarae is corrected as Procellarii and belongs to Colymbomorphae'
- 'Procolophonia is corrected as Procolophonii and belongs to Gephyrostegi'
- 'Proganosauria is a subjective synonym of Mesosauri'
- 'Proostea belongs to Teleostomata'
- 'Prosimiae was reranked as a order and belongs to Mesotheria'
- 'Protelidi belongs to Carnivora'
- 'Proterotheriidae [misspelled as Proterotheridae] belongs to Litopterni'
- 'Protetrapoda belongs to Vertebrata'
- 'Protodonta was reranked as the suborder Protodonti and belongs to Haplodonti'
- 'Protoferi belongs to Carnivora'
- 'Protopteri belongs to Dipnoa'
- 'Protorosauria is corrected as Protorosauri and belongs to Holosauria'
- 'Protostegidae belongs to Chelonii'
- 'Pteraspidi belongs to Heterostraci'
- 'Pterichthyi belongs to Palaeostraci'
- 'Pteropodidae belongs to Megachiroptera'
- 'Pterosauria is corrected as Pterosauri and belongs to Hyperosauria'
- 'Ptychostei belongs to Placodermata'
- 'Pycnodonti belongs to Crossopterygii'
- 'Pythonomorpha is a subjective synonym of Mosasauri'
- 'Rallidae belongs to Gruiformes'
- 'Ratitae was reranked as a order and belongs to Neornithes'
- 'Reptilia belongs to Tetrapoda'
- 'Rhinae belongs to Selachii'
- 'Rhinolophidae belongs to Microchiroptera'
- 'Rhinoraji belongs to Selachii'
- 'Rhynchosauria is corrected as Rhynchosauri and belongs to Holosauria'
- 'Rhytinidae belongs to Sirenii'
- 'Rodentia is corrected as Rodentii and belongs to Mesotheria'
- 'Ruminantia is corrected as Ruminantii and belongs to Diungulati'
- 'Sagecephalus belongs to Dicynodontidae'
- 'Sagecephalus pachyrhynchus belongs to Sagecephalus'
- 'Saurischia is a subjective synonym of Praepubici'
- 'Saururae is a subjective synonym of Archornithes'
- 'Sauropoda was reranked as a unranked clade and belongs to Praepubici'
- 'Sauropterygia is corrected as Sauropterygii and belongs to Holosauria'
- 'Sciuridae belongs to Sciurognathi'
- 'Sciurognathi was reranked as a unranked clade and belongs to Rodentii'
- 'Sclerocephali belongs to Hemispondyla'
- 'Sclerodermi belongs to Plectognathi'
- 'Selachii belongs to Placoidea'
- 'Simiae belongs to Mesotheria'
- 'Simplicidentata is corrected as Simplicidentati and belongs to Rodentii'
- 'Sirenia was reranked as the order Sirenii and belongs to Holotheria'
- 'Soricidae belongs to Lipotyphla'
- 'Sphenisci belongs to Colymbomorphae'
- 'Sphenodonti was reranked as a suborder and belongs to Protorosauri'
- 'Spinacidi belongs to Selachii'
- 'Squalodontidae belongs to Odontoceti'
- 'Squamata is a subjective synonym of Lyognathi'
- 'Statodonti belongs to Selachii'
- 'Steganopodes was reranked as a unranked clade and belongs to Ciconiiformes'
- 'Stegosauridae belongs to Postpubici'
- 'Stegosaurus ungulatus belongs to Stegosaurus'
- 'Sturii belongs to Chondrostei'
- 'Suidae belongs to Suiformes'
- 'Suiformes belongs to Diungulati'
- 'Symbranchia is corrected as Symbranchii and belongs to Teleostea'
- 'Talpini was reranked as the family Talpidae and belongs to Lipotyphla'
- 'Tardigrada was reranked as the suborder Tardigradi and belongs to Xenarthri'
- 'Tarsii was reranked as a suborder and belongs to Prosimiae'
- 'Teleosauridae belongs to Crocodili'
- 'Teleostei is corrected as Teleostea and belongs to Teleostomata'
- 'Teleostomata belongs to Pisces'
- 'Testudinata belongs to Paratheria'
- 'Testudinidae belongs to Cryptodiri'
- 'Tetrapoda belongs to Vertebrata'
- 'Thelodonti belongs to Goniaspidi'
- 'Therapsida was reranked as the order Therapsidi and belongs to Paratheria'
- 'Theridomyidae belongs to Hystricognathi'
- 'Theriodontia is corrected as Theriodonti and belongs to Paratheria'
- 'Therocephalia was reranked as the suborder Therocephali and belongs to Therapsidi'
- 'Tillodontia is corrected as Tillodonti and belongs to Mesotheria'
- 'Tomistominae was reranked as the family Tomistomidae and belongs to Crocodili'
- 'Toxochelyidae belongs to Chelonii'
- 'Trachyacanthi belongs to Holocephala'
- 'Tragulidae belongs to Ruminantii'
- 'Tremataspidi belongs to Goniaspidi'
- 'Trematocephali belongs to Hemispondyla'
- 'Tretosterninae was reranked as the family Tritosternidae and belongs to Cryptodiri'
- 'Triceratops flabellatus belongs to Triceratops'
- 'Triceratops prorsus belongs to Triceratops'
- 'Trichechidae belongs to Phocidi'
- 'Triconodonta was reranked as the suborder Triconodonti and belongs to Haplodonti'
- 'Trigonolestidae belongs to Suiformes'
- 'Trionychia is corrected as Trionychii and belongs to Testudinata'
- 'Trionychidae belongs to Trionychii'
- 'Trirostri belongs to Selachii'
- 'Trituberculata was reranked as the suborder Trituberculati and belongs to Haplodonti'
- 'Tubulidentata belongs to Holotheria'
- 'Tunicata belongs to Protetrapoda'
- 'Turnices belongs to Alectromorphae'
- 'Ungulata was reranked as the order Ungulati and belongs to Holotheria'
- 'Urodeles was reranked as the order Urodela and belongs to Amphibia'
- 'Uronemi belongs to Dipteri'
- 'Urosauri belongs to Microsauria'
- 'Ursidae belongs to Ursocanidi'
- 'Ursocanidi belongs to Carnivora'
- 'Vespertilionidae belongs to Microchiroptera'
- 'Viverridae belongs to Felidi'
- 'Xenarthra was reranked as the order Xenarthri and belongs to Mesotheria'