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Ichthyostega was a Late Devonian stem tetrapod that lived in the rivers of East Greenland. In most ways the anatomy is still that of a fish with fingers, with Ichthyostega being among the earliest vertebrates to bear limbs, fingers and toes. It probably spent almost its entire life in the water, using its fingers to crawl along the bottom of streams and its finned tail for more open-water swimming, but its broad, overlapping ribcage could have braced Ichthyostega if it found itself needing to move on land from one body of water to another.
