Ichthyostega
The fish salamander is one of the oldest known terrestrial vertebrates and also the earliest known amphibian. According to the discovered fossils, they lived approximately 360 million years ago. Compared with the spiny salamander, the limb joints of the fish salamander are very flexible, and the ribs are wide, which is conducive to supporting its body to walk on land. Its spine has also grown joint processes, which can allow the spine to bend and move.
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