Mollusks have four distinct body parts: a foot, a head, a visceral mass, and a tail.

There are only three common body parts in mollusks: the head, foot and visceral mass. The head contains the brain; the foot is for movement and where the muscular section is found. The visceral mass contains all the other organs of the mollusk. They also have a protective tissue called mantle, and some mollusks have shells to protect them.