Download - Mollusks
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Mollusks are soft-bodied animalswith a hard protective covering.
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There are manytypes of mollusks,including clams, oysters, snails,squid and octopi.
There are manyMollusks that weeat!
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The Mollusk Phylum has threeMain classes:
1. Gastropods (ex. - snails)
2. Bivalves (ex. - clams)
3. Cephalopods (ex. - squid)
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Mollusks have a mantle, which is protective tissueCovering its body. They breathe using gills, and theyMove using a muscular foot.
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One advancement that mollusks haveis an open circulatory system.
The blood is not always inside of veins.
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Gastropods(snails) have adapted to life on land.
This is a big step!
Most gastropods are covered with a protective shell.
Many have eyes.
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Gastropods use a radula, a rough tongue,to eat by scraping off food.
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The next class of mollusks is bivalves,which includes clams and oysters
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Bivalves are covered by a hard protective Hinged shell, like this giant clam below.
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The last class of mollusks is cephalopods,Which includes octopi and squid.
Cephalopod means “head-foot”. Can you see why it has this name?
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Cephalopods have many advancements:
1. Closed circulatory system (blood alwayswithin heart or veins)
2. A foot divided in to tentacles
3. A well-developed nervous system with eyes
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Fact or fiction?
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Here is a photo of a real giant squid.
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The squid in the previous picture measured50 feet long and weighed 5000 lbs.! It’s eyes would be almost the size of a soccer ball.
And here’s an interesting fact….in the water, Giant squid are “Horace Mann” maroon in color. Perhaps we should reconsider our mascot?