1. Petromyzontida
   1. Includes lampreys
   2. They have a vertebral column
   3. Example Organisms: Sea Lamprey/
      1. (Petromyzon marinus)
2. Chondrichthyes
   1. Includes sharks, rays, and chimaeras
   2. Includes characteristic above, as well as jaws, and a mineralized skeleton
   3. Example Organisms: Blacktip Reef Shark and Southern Stingray
      1. Carcharhinus melanopterus & Dasyatis americana
3. Actinopterygii
   1. Includes ray-finned fishes
   2. Includes characteristics above, as well as lungs and lung derivatives
   3. Example Organisms: Clownfish and Sea Horses
      1. Amphiprion ocellaris & Hippocampus ramulosus
4. Actinistia
   1. Includes coelacanths
   2. Includes characteristics above, as well as lobed fins
   3. Example Organisms: Coelacanth
      1. Latimeria chalumnae
5. Dipnoi
   1. Includes lungfishes
   2. Includes all characteristics above
   3. Example Organisms: Lungfish
      1. Neoceratodus forsteri
6. Amphibia
   1. Includes frogs and salamanders
   2. Includes characteristics above, as well as legs
   3. Example Organisms: Female Pygmy Marsupial Frog
      1. Flectonotuc pygmaeus
7. Reptilia
   1. Includes turtle, snakes, crocodiles, and birds
   2. Includes all characteristics above, as well as amniotic eggs
   3. Example Organisms: Bushmaker Snake, Australian Thorny Devil, Eastern Box Turtle, and Northern Saw-Whet Owl
      1. Lachesis muta, Moloch horridus, Terrapene carolina carolina, & Aegolius acadicus
8. Mammalia
   1. Includes mammals
   2. Includes all characteristics above, as well as milk
   3. Example Organisms: Short-Beaked Echidna, Coquerel's Sifaka, and Humans
      1. Tachyglossus aculeatus, Propithecus verreauxi, & Homo sapiens