What are the members of the shellfish family?

The shellfish family primarily includes two categories: crustaceans and mollusks. Crustaceans encompass species like shrimp, crabs, lobsters, and crayfish, characterized by their hard exoskeletons. Mollusks include various types such as clams, oysters, mussels, scallops, and snails, which typically have soft bodies and may possess hard shells. Both groups are significant in culinary contexts and marine ecosystems.