Amphibians are ectothermic, tetrapod vertebrates of the class Amphibia. All living amphibians belong to the group Lissamphibia. They inhabit a wide variety of habitats, with most species living within terrestrial, fossorial, arboreal or freshwater aquatic ecosystems. Thus amphibians typically start out as larvae living in water, but some species have developed behavioural adaptations to bypass this.
A list of amphibians organizes the class of amphibian by family and subfamilies and mentions the number of species in each of them.
The list below largely follows Darrel Frost's Amphibian Species of the World (ASW), Version 5.5 (31 January 2011). Another classification, which largely follows Frost, but deviates from it in part is the one of AmphibiaWeb, which is run by the California Academy of Sciences and several of universities. The major differences between these two classifications are:
There are a total of 8216 amphibian species in three orders.[1]
As of 29 August 2020[update], 7243 species of frogs and toads are recognised by Amphibian Species of the World.[1]
As of 29 August 2020[update], 759 species of salamanders are recognised by Amphibian Species of the World.[1]
As of 29 August 2020[update], 214 species of caecilians are recognised by Amphibian Species of the World.[1]