Biology / Unit 10 Bio 2259 short lesson, about 20 seconds
Three Major Mollusk Classes
Captions available
The idea
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.
In practice
An octopus's modified foot forms grasping, sucker-lined arms, a striking departure from a snail's single gliding foot in the same phylum.
Where people slip
Cephalopods, despite their modified plan, still share the foot-mantle-visceral mass organization traced at Bio 2257.
Your place on the trail
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