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Phylum Mollusca (Soft-Bodied), The modified foot is in the head regions…
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Common Name: Cuttlefish Genus: Sepia; Cuttlefish have 10 tentacles, 8 have suction cups and 2 are retractable arms with no suction cups. They are also just generally fast swimmers.
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Common Name: Nautilus Genus: Nautilidae; They have a series of gas chambers as their shell. Have 80-90 tentacles. They are the only cephalopod without an ink sack.
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Common Name: Squid Genus: Loligo; The squid has a reduced shell called a Pen, which is is a thin, horny strip enclosed by the mantle. They're streamlined for speed. They also have 10 tentacles with 8 having suction cups and 2 having no suction cups and being retractable.
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Common Name: Octopus Genus: Octopoda; Octopus usually crawl on the sea floor, but can use Jet Propulsion to move quickly. They have 8 tentacles but their shell has disappeared.
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They have undergone detorsion. Feed with oral tentacles and radula. Don't have a shell or operculum and rhinophors detect odors
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