Osteichthyes are the largest class of vertebrates and include jawed fishes.
They comprise bony fishes present in freshwater and marine aquatic environments.
Endoskeleton is the internal skeleton that supports the structural framework of the animals.
Their endoskeleton is made up of bones and hence are referred to as bony fishes.
They do not possess placoid scales like other classes of fish and instead have three different types of scales - cosmoid scales, ganoid scales, and teleost scales.