Resumen de The eyes have it
Fast forward about 10 million years and vertebrates seem even better suited to wandering ashore. There was Acanthostega, roughly salamander-shaped and 60-centimeters long, with well-defined limbs and eight fingers on each hand, and the larger Ichthyostega, with its seven digits. Although recent studies suggest it would have been more comfortable in water, Ichthyostega was capable of dragging its body along the mud banks. At this point, early tetrapods had limbs, fingers and the ability to breathe air, inherited from their lungfish-like ancestors. Switek investigates what first persuaded amphibians to walk on land
