Three Major Mollusk Classes
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Gastropods, such as snails, move on one broad foot; bivalves, such as clams, filter feed through hinged shells; cephalopods bear a foot modified into arms.
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An octopus's modified foot forms grasping, sucker-lined arms, a striking departure from a snail's single gliding foot in the same phylum.
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Cephalopods, despite their modified plan, still share the foot-mantle-visceral mass organization traced at Bio 2257.