sarcopterygian
adjective
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Definition of 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
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