What are the 5 classes of vertabrates?

There are five main classes of vertebrates, which are:

• Mammals (Mammalia)
• Birds (Aves)
• Reptiles (Reptilia)
• Amphibians (Amphibia)
• Fish - which in turn are subdivided into Agnatha (jawless fish without scales, e.g. lampreys and hagfish); Chondrichthyes (sharks and rays, which have skeletons of cartilage rather than bone); and Osteichthyes (all the bony fish e.g. tuna, trout, whiting, etc.)