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Class Cephalopoda. This class contains the cephalopods, animals commonly known as squid, cuttlefish, octopus, and nautilus. The giant squid is the largest of all mollusks. Most cephalopods are highly adapted for swimming.
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.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.