| Term | Definition |
|---|
| Chordata, Urochordata, Notochord, Dorsal Hollow Nerve Cord, Post anal tail, pharyngeal gill slits | Tunicates |
| Myomerozoa, Cephalochordata, Somites- bands of muscles along notochord | Lancelets |
| Craniata, Myxini, Fibrous plates within cranium | Hagfishes |
| Vertebrata, Petromyzontida, Vertebral column | Lampreys |
| Gnathostomata, Chondrichthyes, Jaws, Mineralized Skeleton | Sharks, rays, skates, ratfishes |
| Osteichthyes, Actinopterygii, Lungs, Endochondral bone, lepidotrichia | Ray-finned fishes |
| Sarcopterygii, Actinistia, Monobasal limbs, limb articulation | Coelacanths |
| Sarcopterygii, Dipneusti, Monobasal limbs, limb articulation | Lungfishes |
| Tetrapoda, Amphibia, 4 limbs, neck, alveoli, 3 chambered heart | Salamanders, Frogs, Caecilians |
| Amniota, Eutheria, Metatheria, Prototheria, Amniotic egg w/ extra-embryonic membranes | Mammilia, Placentals, Marsupials, Egg layers |
| Sauropsida, Chelonia, Suborbital fenestra | Reptilia, Turtles |
| Diapsida, Sphenodontia, Serpentes, Lacertillia, 2 temporal fenestra | Tuataras, Snakes, Lizards |
| Archosaura, Crocodilia, Gizzard, Antorbital fenestra | Crocodiles, Alligators |
| Archosaura, Aves, Feathers | Birds |
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