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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.
They have flexible arms and a siphon. Cephalopods even have a large brain with ganglia located inside of a cranium. If there is a shell present, it is divided by septa. Other members of the Cephalopoda include: the squid, nautilus, and cuttlefish.Subclass: Coleoidea These cephalopods have an internal shell which is greatly reduced in size or is nonexistent. Squid and other octopuses are also included in this grouping.hey have flexible arms and a siphon. Cephalopods even have a large brain with ganglia located inside of a cranium. If there is a shell present, it is divided by septa. Other members of the Cephalopoda include: the squid, nautilus, and cuttlefish.