1. Amphibia: Frogs, toads, salamanders, and caecilians.

2. Aves: Birds.

3. Chondrichthyes: Sharks, rays, and skates.

4. Mammalia: Mammals.

5. Osteichthyes: Bony fish.

6. Reptilia: Lizards, snakes, turtles, and crocodiles.

7. Agnatha: Jawless fish, such as lampreys and hagfish.

Let me know if you'd like more information about any of these classes!