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See bony fish.
any member of the infraclass Teleostei, a large and extremely diverse group of ray-finned fishes. Along with the chondrosteans and the holosteans, they are one of the three major subdivisions of the class Actinopterygii, the most advanced of the bony fishes. The teleosts include virtually all of the world's important sport and commercial fishes, as well as a much larger number of lesser known species. The infraclass is distinguished primarily by the presence of a homocercal tail; i.e., one in which the upper and lower halves are about equal. The teleosts comprise some 20,000 species (about equal to all other vertebrate groups combined), with new species being discovered each year.