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Mollusks are soft-bodied animals with a hard protective covering. - PowerPoint PPT Presentation


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Mollusks are soft-bodied animals with a hard protective covering. There are many types of mollusks, including clams, oysters, snails, squid and octopi. There are many Mollusks that we eat!. The Mollusk Phylum has three Main classes: Gastropods (ex. - snails)

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Presentation Transcript
slide1

Mollusks are soft-bodied animals

with a hard protective covering.

slide2

There are many

types of mollusks,

including clams,

oysters, snails,

squid and octopi.

There are many

Mollusks that we

eat!

slide3

The Mollusk Phylum has three

Main classes:

Gastropods (ex. - snails)

2. Bivalves (ex. - clams)

3. Cephalopods (ex. - squid)

slide4

Mollusks have a mantle, which is protective tissue

Covering its body. They breathe using gills, and they

Move using a muscular foot.

slide5

One advancement that mollusks have

is an open circulatory system.

The blood is not always inside of veins.

slide6

Gastropods(snails) have adapted to life on land.

This is a big step!

Most gastropods are covered with a protective shell.

Many have eyes.

slide7

Gastropods use a radula, a rough tongue,

to eat by scraping off food.

slide8

The next class of mollusks is bivalves,

which includes clams and oysters

slide9

Bivalves are covered by a hard protective

Hinged shell, like this giant clam below.

slide10

The last class of mollusks is cephalopods,

Which includes octopi and squid.

Cephalopod means “head-foot”.

Can you see why it has this name?

slide11

Cephalopods have many advancements:

Closed circulatory system (blood always

within heart or veins)

2. A foot divided in to tentacles

3. A well-developed nervous system with eyes

slide14

The squid in the previous picture measured

50 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?