Mean atmospheric O2
Geologic Time Scale
A Late Devonian tetrapod of the genus Ichthyostega submerged in a floodplain 365 million years ago in what is today the Canadian Arctic. The tree-like trunk immediately behind the Ichthyostega is the base of a Pleuromeia. The Ichthyostega is eyeing a drowned centipede.
Ichthyostega was one of the earliest tetrapods, a descendent of lobe-finned fishes and ancestor of amphibians. Ichthyostega had lungs and seven-toed limbs that allowed it to move about the shallow waters and shores of swamps and floodplains. It was among the first terrestrial vertebrates.
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