The
Sarcopterygii or
lobe-finned fish (from Greek σαρξ
sarx, flesh, and πτερυξ
pteryx, fin) – sometimes considered synonymous with
Crossopterygii ("fringe-finned fish", from Greek κροσσός
krossos, fringe) – constitute a
clade (traditionally a
class or subclass) of the
bony fish, though a strict
cladistic view includes the terrestrial
vertebrates. The living sarcopterygians are the
coelacanths and
lungfish; additionally, all
tetrapods are sarcopterygians or descendants of them.