Modeling the vertebrate invasion of land

Early tetrapods, such as Ichthyostega, moved onto land from aquatic environments over 350 million years ago. Skeletal anatomy demonstrates that the front and hind limbs of these early tetrapods correspond to the pectoral and pelvic fins of fishes. Much study has gone into how these primitive tetrapods were able to pull themselves up onto land and move using both their primitive limbs and tail.

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