Lissamphibia

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,Carroll, Robert 2009. The rise of amphibians: 300 million years of evolution. Johns Hopkins University Press. ISBN 978-0-8018-9140-3 all share certain common characteristics. This indicates they evolved from a common ancestor and so form a clade.

 References 

Category:Amphibians