Asked by: Florenta Bondia
asked in category: General Last Updated: 8th March, 2020

How did fish become amphibians?

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.

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Keeping this in view, how did fish turn into amphibians?

Amphibians evolved during the middle of the Devonian period (416 to 359 million years ago) from the lobe-finned fish of the vertebrate class Sarcopterygii. Species within the genus Ichthyostega (members of the Labyrinthodontia subclass) are considered by some scientists to be the earliest amphibians.

Secondly, what evidence of a fish ancestor is found in amphibians? Evolution of Amphibians Fossil evidence shows that amphibians evolved about 365 million years ago from a lobe-finned lungfish ancestor. As the earliest land vertebrates, they were highly successful. Some of them were much larger than today's amphibians.

People also ask, did fish evolve into amphibians?

ORIGIN OF THE AMPHIBIANS These first tetrapods were amphibians and they evolved around 395 million years ago during the Devonian period from lobe-finned fish named sarcopterygians (class Sarcopterygii, “flesh fins”) within which we find the coelacanth and the current lungfish.

How did fish evolve lungs?

Fish use the swim bladder to control their buoyancy by filling it with oxygen from their gills using a gland called a gas gland. This increases the volume of the bladder and pushes the fish toward the surface of the water. Swim bladders evolved soon after lungs, and are thought to have evolved from lung tissue.

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