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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.
The cephalopods are the most advanced mollusks and include the octopus, squid, and cuttlefish. Of these, only the octopus is really considered benthic. Other than the cuttlefish, these do not appear to have shells. In fact, both squid and octopi have a beak made of shell material.If you try, you can get a squid to bite you.ince there is a huge variety of benthic habitats, mud, sand, rocks, shallow, deep, there is a huge variety of benthic organisms. What they mostly have in common is that they don't swim, at least not much. Nearly every category of animal is included in the benthos. There are the sponges.