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In general, mollusks have 3 body regions: a head, a visceral mass, and a foot.. The head contains the sense organs and brain, while the visceral mass contains the internal organs. The foot is the muscular lower part of the body which is in contact with the substrate.
Snails, oysters, clams, octopuses, and squids are examples of mollusks. â¢ The body cavity in mollusks is a true coelom. â In animals that have a coelom, the gut and other internal organs are suspended from the body wall and are cushioned by the fluid within the coelom. Respiration â Most mollusks respire with gills, which are located in the mantle cavity. The mantle cavity is a space between the mantle and the visceral mass. â Mollusk gills extract 50% or more of the dissolved oxygen from the water that passes over them.