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Amphibians
Temporal range: late Devonianpresent, fossil range 370 mya to present
Collage of amphibians
Clockwise from top right: Seymouria, Mexican burrowing caecilian, eastern newt and leaf green tree frog
Scientific classification e
Kingdom:Animalia
Phylum:Chordata
Clade:Batrachomorpha
Class:Amphibia
Gray 1825
Subclasses
Eryops, typical of the large-size early amphibians 310–295 million years ago

Amphibians are members of the class Amphibia. The living ones are frogs (including toads), salamanders (including newts) and caecilians. They are four-legged vertebrates which are cold blooded.

Amphibians lay their eggs in water, usually in a foam nest. After hatching they are tadpoles, which live in the water and have gills. The tadpoles change into adults in a process called metamorphosis. When they are adult, they have lungs to breathe instead of gills, and legs. Adult amphibians also use their skin to take in oxygen, and some species of salamanders do not have lungs.

The earliest amphibians evolved in the Devonian from lobe-finned fish which had jointed leg-like fins with digits. They could crawl along the sea bottom. Some had developed primitive lungs to help them breathe air when the stagnant pools of the Devonian swamps were low in oxygen. They could also use their strong fins to hoist themselves out of the water and onto dry land if necessary.

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