SUBPHYLUM: Vertebrata

Definition: Chordates with a distinct head with sense organs and a brain, a segmented vertebral rod of cartilage and/or bone, closed circulatory system, and a bilaterally symmetrical body. Body with a true coelum.

SUPERCLASS: Craniata

Definition: Animals with a distinct anterior head containing a brain, visual and balance organs.

"Fishes"
Amphibians
Reptiles (which now includes birds)
Mammals