any of various bony fishes of the subclass Actinopterygii, having strong slender rays, excluding the coelacanth and lungfish.
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Scientific definitions for ray-finned fish
Any of various bony fishes belonging to the subclass Actinopterygii, having fins supported by thin bony rays. Ray-finned fish evolved in the early Devonian Period and include most species of fish today. Also called actinopterygian Compare lobe-finned fish.
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