PARTIAL TAXONOMY OF THE VERTEBRATES

PHYLUM Chordata

• Anamniota 
  • Apoda
    • Acraniata
      • Agnatha: jawless vertebrates
      • Conodontia
      • Mixini: Hagfish
    • Craniata
      • Euagnatha
        • Ostracodermii
        • Diplorhina (Pteraspidomorphi)
        • Monorhina (Cephalospidomorpha): lampreys
      • Gnathostomata
        • Placodermi
        • Chondrichthyes: Cartilagenous fish
          • Elasmobranchii: Sharks and rays
          • Holocephali: Chimaeras
          • Acanthodii
        • Osteichthyes: Bony fish
          • Actinopterygii: Ray-finned fishes
            • Chondrostei: sturgeons and paddlefish
            • Neopterygii: gars, bowfins, teleosts 
              • Teleostii
        • Sarcopterygii: Lobe-finned fishes
          • Dipnoi: Lungfishes
          • Crossopterygii: coelacanths
  • Tetrapoda

    • Amphibia
    • Labrynthodontia
    • Lepospondylii
    • Lissamphibia
    • Anura (Salientia): Frogs and toads
    • Urodela (Caudata): salamanders, newts
    • Apoda (Gymnophona): caecilians

• Amniota 
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      • Sauropsida
        • Anapsida: turtles
        • Diapsida
          • Ichthyopterygia: extinct fishlike aquatic reptiles
          • Sauropterygia: other extinct aquatic reptiles (e.g., plesiosaurs)
          • Lepidosauria: modern snakes, lizards and Sphenodon
            • Squamata: snakes and lizards
          • Archosauromorpha
            • Thecodontia
            • Pteryosauria: Pterodactyls
            • Saurischia: grasping hands, forward pubis
            • Theropoda: Tyrannosaurus
            • Ornithischia: backward-pointing pubis; herbivorous; Tricerotops
            • Crocodylia: Crocodiles, alligators, caimans
            • Aves: birds
      • Synapsida
        • Pelycosauria: sail-backed reptiles (extinct)
        • Therapsida: mammal-like reptiles
        • Mammalia
          • Prototheria: Monotremes
          • Theria
            • Metatheria: Marsupials
            • Eutheria: Placentals