CHRISTIAN JEGOU PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY CHRISTIAN JEGOU PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Early land animal. Artwork depicting Acanthostega, a primitive tetrapod. This animal was among the first vertebrates to evolve limbs and be capabale of coming onto land. It first appeared in the Upper Devonian period (around 360 million years ago).
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