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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.
â¢ 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.â Most terrestrial snails have no gills.dditions and changes to the original content are the responsibility of the instructor. Mollusks and Annelids continued â¢ Marine Worms â Marine segmented worms are members of the class Polychaeta, the largest group of annelids.