Lankide:Ketelu1/Proba orria

Evolutionary history Main article: Evolution of tetrapods See also: List of prehistoric amphibians

The first major groups of amphibians developed in the Devonian period, around 370 million years ago, from lobe-finned fish which were similar to the modern coelacanth and lungfish.[13] These ancient lobe-finned fish had evolved multi-jointed leg-like fins with digits that enabled them to crawl along the sea bottom. Some fish 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 circumstances so required. Eventually, their bony fins would evolve into limbs and they would become the ancestors to all tetrapods, including modern amphibians, reptiles, birds, and mammals. Despite being able to crawl on land, many of these prehistoric tetrapodomorph fish still spent most of their time in the water. They had started to develop lungs, but still breathed predominantly with gills.

Historia ebolutiboa Artikulo nagusia: Evolution of tetrapods Ikusi ere: List of prehistoric amphibians

Lehen anfibio talde nagusiak Devoniar garaian agertu ziren, orain dela 370 milioi urte, Sarcopterygii arrainetik abiatuta, gaur egungo zelakanto eta birikadun arrain modernoen antza zuena. Antzinako Sarcopterygii arraina eboluzionatu egin zen, lauoinka ibiltzeko multi-artikulatuak diren hanka antzeko hegatsak garatu zituelarik. Bizilekua zuten ur geldoko putzuen oxigeno maila baxua zenean, zenbait arrainek aireko oxigenoa arnasteko birika primitiboak garatu zituzten. Beraien hegats indartsuak erabili zitzaketen uretatik irteteko lur lehorrera beharrezkoa bazuten