sarcopterygian

:  of, relating to, or belonging to the Sarcopterygii :  lobe-finned [The coelacanth] is the only living representative of a group of sarcopterygian fishes thought to be extinct since the Late Cretaceous period … — Kim Honey, Globe and Mail (Toronto), 18 Jan. 1999 … supporting the hypothesis that the neural basis of vocal circuits arose before the divergence of sarcopterygian and actinopterygian branches of the vertebrate phylogeny. — Daniel Margoliash and Melina E. Hale, Science, 18 July 2008