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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.
The number of known amphibian species is approximately 7,000, of which nearly 90% are frogs.
The smallest amphibian (and vertebrate) in the world is a frog from New Guinea (Paedophryne amauensis) with a length of just 7.7 mm (0.30 in).
The earliest amphibians evolved in the Devonian period from sarcopterygian fish with lungs and bony-limbed fins, features that were helpful in adapting to dry land.
They diversified and became dominant during the Carboniferous and Permian periods, but were later displaced by reptiles and other vertebrates.
It has been suggested that salamanders arose separately from a Temnospondyl-like ancestor, and even that caecilians are the sister group of the advanced reptiliomorph amphibians, and thus of amniotes.So, take a stroll down memory lane to remember all of our past Word of the Year selections.L’abbandono di Francesco Monte e il nuovo assetto delle squadre dei Mejor e Peor rimescolano le carte in tavola: nuove discussioni tra i naufraghi, il rientro della prima eliminata e un nuovo televoto aperto tra Alessia, Cecilia e Simone.Although the fossils of several older proto-frogs with primitive characteristics are known, the oldest "true frog" is Prosalirus bitis, from the Early Jurassic Kayenta Formation of Arizona. Authorities disagree as to whether Salientia is a superorder that includes the order Anura, or whether Anura is a sub-order of the order Salientia.The Lissamphibia are traditionally divided into three orders, but an extinct salamander-like family, the Albanerpetontidae, is now considered part of Lissamphibia alongside the superorder Salientia.