Opinions from W. H. Flower and R. Lydekker 1891
- 'Amblypoda was reranked as a suborder and belongs to Ungulata'
- 'Amphitheriidae belongs to Polyprotodontia'
- 'Anomaluridae belongs to Simplicidentata'
- 'Anoplotheriadae is corrected as Anoplotheriidae and belongs to Suina'
- 'Anthracotheriidae belongs to Suina'
- 'Anthropoidea belongs to Primates'
- 'Antilocapridae belongs to Pecora'
- 'Archaeoceti belongs to Cetacea'
- 'Arctocyonidae belongs to Creodonta'
- 'Artiodactyla was reranked as a suborder and belongs to Ungulata'
- 'Balanadae is corrected as Balaenidae and belongs to Mystacoceti'
- 'Bovidae belongs to Pecora'
- 'Bradypidae is corrected as Bradypodidae and belongs to Edentata'
- 'Camelidae belongs to Tylopoda'
- 'Canidae belongs to Fissipedia'
- 'Carnivora belongs to Eutheria'
- 'Castoridae belongs to Simplicidentata'
- 'Castoroidinae was reranked as the family Castoroididae and belongs to Simplicidentata'
- 'Caviidae belongs to Simplicidentata'
- 'Cebidae belongs to Anthropoidea'
- 'Centetidae belongs to Insectivora'
- 'Cercopithecidae belongs to Anthropoidea'
- 'Cervidae belongs to Pecora'
- 'Cetacea belongs to Eutheria'
- 'Chalicotheriidae belongs to Perissodactyla'
- 'Cheiromydae is corrected as Chiromyidae and belongs to Lemuroidea'
- 'Chinchillidae belongs to Simplicidentata'
- 'Chiroptera belongs to Eutheria'
- 'Choeropotamidae belongs to Suina'
- 'Chrysochloridae belongs to Insectivora'
- 'Condylarthra was reranked as a suborder and belongs to Ungulata'
- 'Coryphodontidae belongs to Amblypoda'
- 'Cotylopidae belongs to Suina'
- 'Creodonta belongs to Carnivora'
- 'Dasipidae was reranked as the unranked clade Dasypodidae and belongs to Edentata'
- 'Dasyproctidae belongs to Simplicidentata'
- 'Deinotheriidae is corrected as Dinotheriidae and belongs to Proboscidea'
- 'Delphinidae belongs to Odontoceti'
- 'Dermoptera was reranked as a suborder and belongs to Insectivora'
- 'Dichodontidae belongs to Suina'
- 'Didelphidae [misspelled as Didelphyidae] belongs to Polyprotodontia'
- 'Dinomyidae belongs to Simplicidentata'
- 'Dipodidae belongs to Simplicidentata'
- 'Diprotodontia was reranked as a order and belongs to Marsupialia'
- 'Diprotodontidae belongs to Diprotodontia'
- 'Dromatheriidae belongs to Polyprotodontia'
- 'Duplicidentata was reranked as a suborder and belongs to Rodentia'
- 'Echidnidae belongs to Monotremata'
- 'Edentata belongs to Eutheria'
- 'Elephantidae belongs to Proboscidea'
- 'Emballonuridae belongs to Microchiroptera'
- 'Equidae belongs to Perissodactyla'
- 'Erinaceidae belongs to Insectivora'
- 'Eutheria belongs to Mammalia'
- 'Felidae belongs to Fissipedia'
- 'Fissipeda was reranked as the suborder Fissipedia and belongs to Carnivora'
- 'Galeopithecidae belongs to Dermoptera'
- 'Geomyidae belongs to Simplicidentata'
- 'Giraffidae belongs to Pecora'
- 'Glyptodontidae belongs to Edentata'
- 'Halicoridae belongs to Sirenia'
- 'Halitheriidae belongs to Sirenia'
- 'Hapalidae belongs to Anthropoidea'
- 'Haplodontidae belongs to Simplicidentata'
- 'Hippopotamidae belongs to Suina'
- 'Hominidae belongs to Anthropoidea'
- 'Hyaenidae belongs to Fissipedia'
- 'Hyaenodontidae belongs to Creodonta'
- 'Hyopsodontidae belongs to Lemuroidea'
- 'Hyracidae belongs to Hyracoidea'
- 'Hyracoidea was reranked as a suborder and belongs to Ungulata'
- 'Hystricidae belongs to Simplicidentata'
- 'Insectivora belongs to Eutheria'
- 'Ischyromyidae belongs to Simplicidentata'
- 'Lagomyidae belongs to Duplicidentata'
- 'Lambdotheriidae belongs to Perissodactyla'
- 'Lemuridae belongs to Lemuroidea'
- 'Lemuroidea was reranked as a superfamily and belongs to Primates'
- 'Leporidae belongs to Duplicidentata'
- 'Lophiodontidae belongs to Perissodactyla'
- 'Lophiomyidae belongs to Simplicidentata'
- 'Macraucheniidae belongs to Perissodactyla'
- 'Macropidae is corrected as Macropodidae and belongs to Diprotodontia'
- 'Macroscelididae belongs to Insectivora'
- 'Manatidae belongs to Sirenia'
- 'Manidae belongs to Edentata'
- 'Marsupialia was reranked as a order and belongs to Metatheria'
- 'Megachiroptera belongs to Chiroptera'
- 'Megatheriadae is corrected as Megatheriidae and belongs to Edentata'
- 'Meniscotheriidae belongs to Condylarthra'
- 'Merycopotamidae belongs to Suina'
- 'Mesonychidae belongs to Creodonta'
- 'Metatheria belongs to Mammalia'
- 'Microchiroptera belongs to Chiroptera'
- 'Monotremata belongs to Prototheria'
- 'Multituberculata was reranked as a unranked clade and belongs to Prototheria'
- 'Muridae belongs to Simplicidentata'
- 'Mustelidae belongs to Fissipedia'
- 'Myoxidae belongs to Simplicidentata'
- 'Myrmecophagidae belongs to Edentata'
- 'Mystacoceti belongs to Cetacea'
- 'Nototheriidae belongs to Diprotodontia'
- 'Nycteridae belongs to Microchiroptera'
- 'Octodontidae belongs to Simplicidentata'
- 'Odontoceti belongs to Cetacea'
- 'Ornithorhynchidae belongs to Monotremata'
- 'Orycteropodidae belongs to Edentata'
- 'Otariina was reranked as the family Otariidae and belongs to Pinnipedia'
- 'Palaeotheriidae belongs to Perissodactyla'
- 'Pantolambdidae belongs to Amblypoda'
- 'Pecora was reranked as a unranked clade and belongs to Artiodactyla'
- 'Peramelidae belongs to Polyprotodontia'
- 'Periptychidae belongs to Condylarthra'
- 'Perissodactyla belongs to Ungulata'
- 'Phalangeridae belongs to Diprotodontia'
- 'Phascolomidae is corrected as Phascolomyidae and belongs to Diprotodontia'
- 'Phenacodontidae belongs to Condylarthra'
- 'Phocadae is corrected as Phocidae and belongs to Pinnipedia'
- 'Phyllostomatidae belongs to Microchiroptera'
- 'Physeteridae belongs to Odontoceti'
- 'Pinnipedia was reranked as a suborder and belongs to Carnivora'
- 'Plagiaulacidae belongs to Multituberculata'
- 'Platanistina was reranked as the family Platanistidae and belongs to Odontoceti'
- 'Poebrotheriidae belongs to Tylopoda'
- 'Polymastodontidae belongs to Multituberculata'
- 'Polyprotodonta was reranked as the suborder Polyprotodontia and belongs to Marsupialia'
- 'Potamogalidae belongs to Insectivora'
- 'Primates belongs to Eutheria'
- 'Proboscidea was reranked as a suborder and belongs to Ungulata'
- 'Procyonidae belongs to Fissipedia'
- 'Protelidae belongs to Fissipedia'
- 'Prototheria belongs to Mammalia'
- 'Proviverrinae was reranked as the family Proviverridae and belongs to Creodonta'
- 'Pteropodidae belongs to Megachiroptera'
- 'Rhinocerotidae belongs to Perissodactyla'
- 'Rhinolophidae belongs to Microchiroptera'
- 'Rhytinidae belongs to Sirenia'
- 'Rodentia belongs to Eutheria'
- 'Simiidae belongs to Anthropoidea'
- 'Simplicidentata belongs to Rodentia'
- 'Sirenia was reranked as a order and belongs to Eutheria'
- 'Solenodontidae belongs to Insectivora'
- 'Soricidae belongs to Insectivora'
- 'Spalacidae belongs to Simplicidentata'
- 'Spalacotheriidae belongs to Polyprotodontia'
- 'Suidae belongs to Suina'
- 'Suina was reranked as a unranked clade and belongs to Artiodactyla'
- 'Talpini was reranked as the family Talpidae and belongs to Insectivora'
- 'Taperidae is corrected as Tapiridae and belongs to Perissodactyla'
- 'Tarsiidae belongs to Lemuroidea'
- 'Theridomyidae belongs to Simplicidentata'
- 'Tillodontia was reranked as a suborder and belongs to Eutheria'
- 'Titanotheriidae belongs to Perissodactyla'
- 'Toxodontia belongs to Ungulata'
- 'Toxodontidae belongs to Toxodontia'
- 'Tragulidae belongs to Tragulina'
- 'Tragulina was reranked as a unranked clade and belongs to Artiodactyla'
- 'Trichechidae belongs to Pinnipedia'
- 'Tritylodontidae belongs to Multituberculata'
- 'Tupaiidae belongs to Insectivora'
- 'Tylopoda was reranked as a unranked clade and belongs to Artiodactyla'
- 'Typotheriidae belongs to Toxodontia'
- 'Uintatheriidae belongs to Amblypoda'
- 'Ungulata was reranked as a order and belongs to Eutheria'
- 'Ursidae belongs to Fissipedia'
- 'Vespertilionidae belongs to Microchiroptera'
- 'Viverridae belongs to Fissipedia'
- 'Zeuglodontidae belongs to Archaeoceti'