Amphibia

Amphibians are ectothermic, tetrapod vertebrates of the class Amphibia. The word "Amphibian" is derived from the Ancient Greek term ἀμφίβιος (amphíbios), which means "both kinds of life", ἀμφί meaning "of both kinds" and βιος meaning "life". The term was initially used as a general adjective for animals that could live on land or in water, including seals and otters. Traditionally, the class Amphibia includes all tetrapod vertebrates that are not amniotes. Amphibia in its widest sense (sensu lato) was divided into three subclasses, two of which are extinct. For more information, visit the Wikipedia entry Get back to Animalia
Anura	Caudata	Crassigyrinus	Ichthyostegalia
Lepospondyli	Reptiliomorpha	Temnospondyli	Triadobatrachus