Chordata

Chordates are all animals that have a notochord or back bone.

Tunicates (Salps and Sea Squirts)

Lancelets

Jawless Fish (Hagfish and Lampreys)

Cartilaginous fishes (Sharks, Rays and Chimera)

Ray-Finned Fish (Most fish)

Lobe-Finned Fish (Lung Fish and Coelacanths)

Amphibians (Frogs and Salamanders)

Testudines (Turtles and Terrapins)

Lepidosaurs (Lizards, Snakes, and Sphenodonts)

Choristodera (Champosaurs and kin)

Crocodylomorpha (Crocodiles and kin)

Pterosauria (Pterosaurs)

Dinosauria (Dinosaurs including Birds)

Synapsida (Dicynodonts and Mammals)