The subclass Lissamphibia includes all living amphibians. They are classified in three orders:
- the Anura: frogs, including toads
- the Caudata or Urodela: salamanders, including newts
- the Gymnophiona or Apoda: the limbless caecilians.
Although the ancestry of each group is controversial, all share certain common characteristics. This indicates they evolved from a common ancestor and so form a clade.