4 mar 375166666 año aC - Panderichthys, Ichthyostega, and Tiktaalik

Descripción:

<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.

Añadido al timeline:

fecha: