The taxonomy of the vertebrates presented by John Zachary Young in The Life of Vertebrates (1962)^[1] is a system of classification with emphasis on this group of animals.

• Phylum Chordata [p. 24]
  • Subphylum 1. Hemichordata (e.g., Balanoglossus, Cephalodiscus, Rhabdopleura)
  • Subphylum 2. Cephalochordata (= Acrania) (e.g., Branchiostoma)
  • Subphylum 3. Tunicata (e.g., Ciona)
  • Subphylum 4. Vertebrata (= Craniata)
    • Superclass 1. Agnatha
      • Class 1. Cyclostomata
      • Class 2. †Cephalaspidomorphi (e.g., †Cephalaspis)
      • Class 3. †Pteraspidomorphi (e.g., †Pteraspis)
      • Class 4. †Anaspida (e.g., †Birkenia, †Jamoytius)
    • Superclass 2. Gnathostomata
      • Class 1. †Placodermi (e.g., †Acanthodes)
      • Class 2. Elasmobranchii
      • Class 3. Actinopterygii
      • Class 4. Crossopterygii
      • Class 5. Amphibia
      • Class 6. Reptilia
      • Class 7. Aves
      • Class 8. Mammalia

• Subphylum Vertebrata (= Craniata)
  • Superclass 1. Agnatha [p. 81]
    • Class 1. Cyclostomata
      • Order 1. Petromyzontia (e.g., Petromyzon, Lampetra, Entosphenus, Geotria, Mordacia)
      • Order 2. Myxinoidea (e.g., Myxine, Bdellostoma)
    • Class 2. †Osteostraci (e.g., †Cephalaspis, †Tremataspis)
    • Class 3. †Anaspida (e.g., †Birkenia, †Jamoytius)
    • Class 4. †Heterostraci (e.g., †Astraspis, †Pteraspis, †Drepanaspis)
    • Class 5. †Coelolepida (e.g., †Thelodus, †Lanarkia)

• Superclass 2. Gnathostomata
  • Class Elasmobranchii (= Chondrichthyes) [p. 175]
    • Subclass 1. Selachii
      • Order 1. †Cladoselachii (e.g., †Cladoselache, †Goodrichia)
      • Order 2. †Pleuracanthodii (e.g., †Pleuracanthus)
      • Order 3. Protoselachii (e.g., †Hybodiis, Heterodontus)
      • Order 4. Euselachii
        • Suborder 1. Pleurotremata
          • Division 1. Notidanoidea (e.g., Hexanchus, Chlamydoselache)
          • Division 2. Galeoidea (e.g., Scyliorhinus, Mustelus, Cetorhinus, Carcharodon)
          • Division 3. Squaloidea (e.g., Squalus, Squatina, Pristiophorus, Alopias)
        • Suborder 2. Hypotremata (e.g., Raja, Rhinobatis, Pristis, Torpedo, Trygon)
    • Subclass 2. Bradyodonti
      • Order 1. †Eubradyodonti (e.g., †Helodus)
      • Order 2. Holocephali (e.g., Chimaera)

• Class Actinopterygii [p. 228]
  • Superorder 1. Chondrostei
    • Order 1. Palaeoniscoidei (e.g., †Cheirolepis, †Palaeoniscus, †Amphicentrum, †Platysomus, †Dorypterus, †Cleithrolepis, †Tarrasius, Polypterus [bichir])
    • Order 2. Acipenseroidei (e.g., †Chondrosteus, Acipenser [sturgeon], Polyodon [paddle-fish])
    • Order 3. Subholostei (e.g., †Ptycholepis)
  • Superorder 2. Holostei (e.g., †Acentrophorus, †Lepidotes, †Dapedius, †Microdon, Amia [bowfin], Lepisosteus [gar-pike])
  • Superorder 3. Teleostei
    • Order 1. Isospondyli (e.g., †Leptolepis, †Portheus, Clupea [herring], Salmo [trout])
    • Order 2. Ostariophysi (e.g., Cyprinus [carp], Tinea^{[clarification needed]} [tench], Silurus [catfish])
    • Order 3. Apodes (e.g., Anguilla [eel], Conger [conger eel])
    • Order 4. Mesichthyes (e.g., Esox [pike], Belone, Exocoetus [flying fish], Gasterosteus [stickle-back], Syngnathus [pipe-fish], Hippocampus [seahorse])
    • Order 5. Acanthopterygii (e.g., †Hoplopteryx, Zens [John Dory], Perca [perch], Labrus [wrasse], Uranoscopus [star gazer], Blennius [blenny], Gadus [whiting], Pleuronectes [plaice], Solea [sole], Lophius [angler-fish])

• Class Crossopterygii [p. 268]
  • Order 1. Rhipidistia
    • Suborder 1. †Osteolepidoti (e.g., †Osteolepis, †Sauripterus, †Diplopterax, †Eusthenopteron)
    • Suborder 2. Coelacanthini (= Actinistia) (e.g., †Coelacanthus, †Undina, Latimeria)
  • Order 2. Dipnoi (e.g., †Dipterus, †Ceratodus, Neoceratodus, Protopterus, Lepidosiren)

• Class Amphibia [p. 296]
  • Subclass 1. †Stegocephalia
    • Order 1. †Labyrinthodontia
      • Suborder 1. †Ichthyostegalia (e.g., †Ichthyostega, †Elpistostege)
      • Suborder 2. †Embolomeri (e.g., †Eogyrinus, †Loxomma)
      • Suborder 3. †Rhachitomi (e.g., †Eryops, †Cacops)
      • Suborder 4. †Stereospondyli (e.g., †Capitosaurus, †Buettneria)
    • Order 2. †Phyllospondyli (e.g., †Branchiosaurus)
    • Order 3. †Lepospondyli (e.g., †Dolichosoma, †Diplocaulus, †Microbrachis)
    • Order 4. †Adelospondyli (e.g., †Lysorophus)
  • Subclass 2. Urodela (= Caudata) (e.g., Molge, Salamandra, Ambystoma, Necturus)
  • Subclass 3. Anura (= Salientia) (e.g., †Miobatrachus, †Protobatrachiis, Rana, Bufo, Hyla, Pipa)
  • Subclass 4. Apoda (= Gymnophiona = Caecilia) (e.g., Ichthyophis, Typhlonectes)

• Class Reptilia [p. 369]
  • Subclass 1. Anapsida
    • Order 1. †Cotylosauria (e.g., †Seymouria, †Captorhinus, †Diadectes)
    • Order 2. Chelonia (e.g., †Eunotosaurus, †Triassochelys, Chelys, Emys, Chelone, Testudo)
  • Subclass 2. †Synaptosauria
    • Order 1. †Protorosauria (e.g., †Araeoscelis, †Tanystropheus)
    • Order 2. †Sauropterygia (e.g., †Lariosaurus, †Pliosaurus, †Plesiosaurus, †Placodus)
  • Subclass 3. †Ichthyopterygia
    • Order 1. †Ichthyosauria (e.g., †Mixosaurus, †Ichthyosaurus)
  • Subclass 4. Lepidosauria
    • Order 1. †Eosuchia (e.g., †Youngina, †Prolacerta)
    • Order 2. Rhynchocephalia (e.g., †Homoesaurus, †Rhynchosaurus, Sphenodon [= Hatteria])
    • Order 3. Squamata
      • Suborder 1. Lacertilia (= Sauria)
        • Infraorder 1. Gekkota (e.g., Gecko)
        • Infraorder 2. Iguania (e.g., Iguana, Anolis, Phrynosoma, Draco, Lyriocephalus, Agama, Chamaeleo)
        • Infraorder 3. Scincomorpha (e.g., Lacerta, Scincus, Amphisbaena)
        • Infraorder 4. Anguimorpha (e.g., †Dolichosaurus, †Aigialosaurus, †Tylosaurus, Varanus, Lanthanotus, Anguis)
      • Suborder 2. Ophidia (= Serpentes) (e.g., †Palaeophis, Python, Natrix, Naja, Vipera)
  • Subclass 5. Archosauria
    • Order 1. †Pseudosuchia (= †Thecodontia) (e.g., †Euparkeria, †Saltoposuchus)
    • Order 2. †Phytosauria (e.g., †Phytosaurus, †Mystriosuchus)
    • Order 3. Crocodilia (e.g., †Protosuchus, Crocodilus, Alligator, Caiman, Gavialis)
    • Order 4. †Saurischia
      • Suborder 1. †Theropoda (e.g., †Compsognathus, †Ornitholestes, †Allosaurus, †Tyrannosaurus, †Struthiomimus)
      • Suborder 2. †Sauropoda (e.g., †Apatosaurus [= †Brontosaurus], †Diplodocus, †Yaleosaurus, †Plateosaurus, Brachiosaurus)
    • Order 5. †Ornithischia
      • Suborder 1. †Ornithopoda (e.g., †Camptosaurus, †Iguanodon, †Hadrosaurus)
      • Suborder 2. †Stegosauria (e.g., †Stegosaurus)
      • Suborder 3. †Ankylosauria (e.g., †Ankylosaurus, †Nodosaurus)
      • Suborder 4. †Ceratopsia (e.g., †Triceratops)
    • Order 6. †Pterosauria (e.g., †Rhamphorhynchus, †Pteranodon)
  • Subclass 6. †Synapsida [pp. 370, 533]
    • Order 1. †Pelycosauria (= †Theromorpha) (e.g., †Varanosaurus, †Edaphosaurus, †Dimetrodon)
    • Order 2. †Therapsida
      • Suborder 1. †Dicynodontia (e.g., †Galepus, †Moschops, †Dicynodon, †Kannemeyeria)
      • Suborder 2. †Theriodontia (e.g., †Cynognathus, †Scymnognathus, †Bauria, †Dromatherium, †Tritylodon, †Oligokyphus)
    • Order 3. †Mesosauria (= †Proganosauria) (e.g., †Mesosaurus)

• Class Aves [p. 509]
  • Subclass 1. †Archaeornithes (e.g., †Archaeopteryx)
  • Subclass 2. Neornithes
    • Superorder 1. †Odontognathae (e.g., †Hesperornis, †Ichthyornis)
    • Superorder 2. Palaeognathae [ratites] (e.g., Struthio, Rhea, Dromiceius, Casuarius, †Dinornis, †Aepyornis, Apteryx, Tinamus)
    • Superorder 3. Impennae [penguins] (e.g., Spheniscus, Aptenodytes)
    • Superorder 4. Neognathae
      • Order 1. Gaviiformes [loons] (e.g., Gavia [loon])
      • Order 2. Colymbiformes [grebes] (e.g., Colymbus [= Podiceps] [grebe])
      • Order 3. Procellariiformes [petrels] (e.g., Fulmarus [petrel], Puffinus [shearwater], Diomedea [albatross])
      • Order 4. Pelecaniformes (e.g., Phalacrocorax [cormorant], Pelecanus [pelican], Sida [gannet])
      • Order 5. Ciconiiformes (e.g., Ciconia [stork], Ardea [heron], Phoenicopterus [flamingo])
      • Order 6. Anseriformes [ducks] (e.g., Anas [duck], Cygnus [swan])
      • Order 7. Falconiformes [hawks] (e.g., Falco [kestrel], Aquila [eagle], Buteo [buzzard], Neophron [vulture], Milvus [kite])
      • Order 8. Galliformes [game birds] (e.g., Gallus [fowl], Phasianus [pheasant], Perdix [partridge], Lagopus [grouse], Meleagris [turkey], Numida [guinea fowl], Pavo [peacock], Opisthocomus [hoatzin])
      • Order 9. Gruiformes [rails] (e.g., Fulica [coot], Gallinula [moorhen], Crex [corn-crake], Grus [crane], †Phororhacos, †Diatryma)
      • Order 10. Charadriiformes [waders and gulls] (e.g., Numenius [curlew], Capella [snipe], Calidris [sandpiper], Vanellus [lapwing], Scolopax [woodcock], Larus [gull], Uria [guillemot], Plautus [little auk])
      • Order 11. Columbiformes [pigeons] (e.g., Columba [pigeon], †Raphus [dodo])
      • Order 12. Cuculiformes [cuckoos] (e.g., Cuculus [cuckoo])
      • Order 13. Psittaciformes [parrots]
      • Order 14. Strigiformes [owls] (e.g., Athene [little owl], Tyto [farm owl], Strix [tawny owl])
      • Order 15. Caprimulgiformes [nightjars] (e.g., Caprimulgus [nightjar])
      • Order 16. Micropodiformes (e.g., Apus [swift], Trochilus [humming-bird])
      • Order 17. Coraciiformes (e.g., Merops [bee-eater], Alcedo [kingfisher])
      • Order 18. Piciformes [woodpeckers] (e.g., Picus [woodpecker])
      • Order 19. Passeriformes [perching birds] (e.g., Corvus [rook], Sturnus [starling], Fringilla [finch], Passer [house-sparrow], Alauda [lark], Anthus [pipit], Motacilla [wagtail], Certhia [tree-creeper], Parus [tit], Lanius [shrike], Sylvia [warbler], Turdus [thrush], Erithacus [British robin], Luscinia [nightingale], Prunella [hedge-sparrow], Troglodytes [wren], Hirundo [swallow])

• Class Mammalia [p. 533]
  • Subclass 1. Eotheria
    • Order †Docodonta (e.g., †Morganucodon, †Docodon)
    • Order incertae sedis †Diarthrognathus
  • Subclass 2. Prototheria
    • Order Monotremata (e.g., Tachyglossus [= Echidna] [spiny anteater], Zaglossus [= Proechidna], Ornithorhynchus [platypus])
  • Subclass 3. †Allotheria
    • Order †Multituberculata (e.g., †Plagiaulax, †Ptilodus)
  • Subclass 4. Theria
    • Infraclass 1. †Pantotheria
      • Order 1. †Eupantotheria (e.g., †Amphitherium)
      • Order 2. †Symmetrodonta (e.g., †Spalacotherium)
    • Infraclass 2. Metatheria
      • Order Marsupialia
    • Infraclass 3. Eutheria (= Placentalia)
      • Order incertae sedis †Triconodonta (e.g., †Amphilestes, †Triconodon)

• Infraclass 2. Metatheria [p. 563]
  • Order Marsupialia
    • Superfamily 1. Didelphoidea (e.g., †Eodelphis, Didelphis [opossum], Chironectes [water opossum])
    • Superfamily 2. †Borhyaenoidea (e.g., †Thylacosmilus, †Borhyaena)
    • Superfamily 3. Dasyuroidea (e.g., Dasyurus [native cat], Sarcophilus [Tasmanian devil], Thylacinus [Tasmanian wolf], Myrmecobius [banded ant-eater], Notoryctes [marsupial mole], Sminthopsis [pouched mouse])
    • Superfamily 4. Perameloidea (e.g., Perameles [bandicoot])
    • Superfamily 5. Caenolestoidea (e.g., †Palaeothentes [= †Epanorthus], Caenolestes [opossum-rat])
    • Superfamily 6. Phalangeroidea (e.g., Trichosurus [Australian opossum], Petaurus [flying opossum], Phascolarctos [koala bear], Vombatus [wombat], Macropus [kangaroo], Bettongia [rat kangaroo], †Diprotodon, †Thylacoleo)

• Infraclass 3. Eutheria [p. 577]
  • Cohort 1. Unguiculata
    • Order 1. Insectivora [p. 581]
    • Order 2. Chiroptera [p. 585]
    • Order 3. Dermoptera
    • Order 4. †Taeniodonta
    • Order 5. †Tillodontia
    • Order 6. Edentata [p. 592]
    • Order 7. Pholidota
    • Order 8. Primates [p. 602]
  • Cohort 2. Glires [p. 653]
    • Order 1. Rodentia
    • Order 2. Lagomorpha
  • Cohort 3. Mutica [p. 666]
    • Order Cetacea
  • Cohort 4. Ferungulata
    • Superorder 1. Ferae [p. 679]
      • Order Carnivora
    • Superorder 2. Protungulata [p. 699]
      • Order 1. †Condylarthra
      • Order 2. †Notoungulata
      • Order 3. †Litopterna
      • Order 4. †Astrapotheria
      • Order 5. Tubulidentata
    • Superorder 3. Paenungulata [p. 706]
      • Order 1. Hyracoidea
      • Order 2. Proboscidea
      • Order 3. †Pantodonta
      • Order 4. †Dinocerata
      • Order 5. †Pyrotheria
      • Order 6. †Embrithopoda
      • Order 7. Sirenia
    • Superorder 4. Mesaxonia [p. 723]
      • Order Perissodactyla
    • Superorder 5. Paraxonia [p. 745]
      • Order Artiodactyla

• Order 8. Primates [p. 602]
  • Suborder 1. Prosimii
    • Infraorder 1. Lemuriformes
      • Family 1. †Plesiadapidae (e.g., †Plesiadapis)
      • Family 2. †Adapidae (e.g., †Notharctus, †Adapis)
      • Family 3. Lemuridae (e.g., †Megaladapis, Lemur [common lemur])
      • Family 4. Indridae (e.g., Indri [indris])
      • Family 5. Daubentoniidae (e.g., Daubentonia [= Cheiromys] [aye-aye])
    • Infraorder 2. Lorisiformes
      • Family. Lorisidae (e.g., Loris [slender loris], Galago [bush baby], Perodicticus [potto])
    • Infraorder 3. Tarsiiformes
      • Family 1. †Anaptomorphidae (e.g., †Necrolemur, †Pseudoloris)
      • Family 2. Tarsiidae (e.g., Tarsius [tarsier])
  • Suborder 2. Anthropoidea
    • Superfamily 1. Ceboidea [New World monkeys]
      • Family 1. Callithricidae (e.g., Callithrix [= Hapale] [marmoset])
      • Family 2. Cebidae (e.g., †Homunculus, Cebus [capuchin], Ateles [spider monkey], Alouatta [howler monkey])
    • Superfamily 2. Cercopithecoidea
      • Family 1. †Parapithecidae (e.g., †Parapithecus)
      • Family 2. Cercopithecidae [Old World monkeys] (e.g., †Mesopithecus, Macaca [rhesus monkey, macaque], Papio [baboon], Mandrillus [mandrill], Cercopithecus [guenon], Presbytis [langur], Colobus, [guereza])
    • Superfamily 3. Hominoidea
      • Family 1. Pongidae apes (e.g., †Propliopithecus, †Pliopithecus, †Dryopithecus, †Oreopithecus †Australopithecus, †Proconsul, Hylobates gibbon, Pongo orangutan, Pan chimpanzee, Gorilla gorilla)
      • Family 2. Hominidae human (e.g., †Pithecanthropus [= †Sinanthropus] [Java and Pekin man], Homo [human (“all living races”)])