They are members of cartilaginous class of fish.

Elasmobranchii is a subclass for sharks

Sharks are fish, of the class chondrichthyes, subclass elasmobranchii and the Superorder selachimorpha. There are about 440 species of sharks.

Chondrichthyes are divided into two subclasses, these are elasmobranchii, and holocephali. These are both marine species and have skeletons made out of cartilage.Ê

There are two subclasses of cartilaginous fish. Elasmobranchii and holocephali. The subclass elasmobranchii encompasses sharks. The subclass holocephali encompasses rays and skates.
Sharks, skates, and stingrays.