The mantle secretes the shell in mollusks. Concentric growth rings are found on cephalopods. The prismatic layer is found on the outside of the bivalve's shell. The cephalopod has suction cups on its tentacles. A univalve is also known as a gastropod.
Cephalopod means head-footed.
Gastro means hatchet. Pod means belly. Mollusk means soft bodied. The three parts of the mollusk are the head, body and foot. Return to contents.