Sarcopterygii
The first sarcopterygians, found in the uppermost Silurian (about 418 mya), closely resembled the Acanthodii, the 'spiny fish' which went extinct at the end of the Palaeozoic era. In the early–middle Devonian (416–385 mya), while the predatory placoderms dominated the seas, some sarcopterygians came into freshwater habitats.