First Animal To Walk On Land. The identification of the legs, and one complete foot, was made in 2002, and announced on 4 july 2002. Published on 12/8/2016 at 9:11 am.
Almost half a billion years ago earth was largely inhabited by armored arthropods with segmented bodies and jointed limbs, shelled mollusks, and wobbly unrecognizable fishlike organisms darting about. Ichthyostegas are one of the first animals to walk on earth. It lived at the end of the upper devonian period.
The presence of the relatively complex comb jelly at the base of the tree of life suggests that the first animal was probably more complex than previously believed, says dunn.
The most famous example is dimetrodon , a large predatory “reptile” with a sail on its back. The tail had many bones to support itself like the ones in fishes. Researchers have long known that fish evolved into the first creatures on land with four legs and backbones more than 365 million years ago, but they've had precious little fossil evidence to document how it happened. The fossil of charnia, which may have been the first animal to have lived on earth, was found by an english schoolboy in 1957.