4 marzo 375166666 anni a. C. - Panderichthys, Ichthyostega, and Tiktaalik

Descrizione:

<i>Panderichythys</i> was long thought to be a transitional fossil, but is likely part of a later, separate lineage of tetrapodomorph lobe-finned fish.

<i>Ichthyostega</i> was a transitional species from the earlier, fishy tetrapod-type organisms to the proper tetrapods, possessing well-developed lungs and better nostrils.

And yet another good example of an early species transitioning towards amphibians was the fleshy-lobe-finned <i>Tiktaalik</i>, which lived during the Carboniferous.

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