What animal is an evolutionary link between fish and amphibians?

Answer 1

Fossils show a great record of the adaptation from the fully aquatic morphology of fish to the semi-aquatic amphibian morphology. There are many fossils of fish that had increased thickness and strength of the shoulder girdle, and more limb-like front fins. If you look at the fossil of Tiktaalik you will notice that it has eyes and nostrils on the top of its head, much like an alligator or crocodile. Its front limbs and pectoral and shoulder muscles are also well developed. There are other lungfish that clearly show above water respiratory capabilities as well.

Answer 2

These animals are generally called 'early tetrapods.' Tetra means four and pod means leg/foot. Thus 'early tetrapods' refers to the first four-legged animals.

See the related link for a basic cladogram:

Answer 3

During the Carboniferous period of the Paleozoic Era, about 350,000,000 years ago, a genus of animals we call Westlothiana was the earliest known reptile-like amphibian or amphibian-like reptile. Westlothiana was terrestrial and probably lived near fresh water. It resembled a small lizard. Fossils have been found in northern Great Britain, with the first discovery in West Lothian, Scotland, which gave the genus its name.