Ichthyostega

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Ichthyostega is an extinct tetrapodomorph) from the Devonian period, about 380 million years ago. Ichthyostega was one of the important transitionary fossils during the fish-tetrapod evolution, when fish first walked on land. Ichthyostega was the first four-limbed vertebrate. It adapted with lungs and weight-bearing limbs for terrestrial locomotion.