Sarcopterygii
In the early Devonian (416–397 mya), the sarcopterygians split into two main lineages — the Coelacanths and the Rhipidistia. The former never left the oceans and their heyday was the late Devonian and Carboniferous, from 385 to 299 mya, as they were more common during those periods than in any other period in the Phanerozoic; coelacanths still live today in the oceans (genus Latimeria).