A

David

Darling

Teleostei

The Teleostei is the largest group of living fish, found in both the oceans and in freshwater habitats. Teleosts are characterized by a fully movable maxilla and premaxilla (which form the biting surface of the upper jaw); the movable upper jaw makes it possible for teleosts to protrude their jaws when opening the mouth. Teleosts are also distinguished by having symmetrical tails.