MOLLUSKS

-soft bodied buddies-

TYPES OF MOLLUSKS

GGastropodsastropods – snails and slugs – snails and slugs

BivalvesBivalves – oysters, clams, – oysters, clams, mussels, and scallops mussels, and scallops

CephalopodsCephalopods – Octopus, squids, – Octopus, squids, and chambered nautilus and chambered nautilus

All Mollusks have 3 body parts: 1. 1. HeadHead- contains mouth, brain, - contains mouth, brain,

stomach, and eyesstomach, and eyes

2. 2. BodyBody- contains heart and other - contains heart and other digestive organs as well as the digestive organs as well as the mantlemantle- a - a fleshy organ that produces the animal’s fleshy organ that produces the animal’s shellshell

3. 3. FootFoot- helps the animal get around - helps the animal get around (swimming, crawling, digging)(swimming, crawling, digging)

CLAMS –have two shells that are hinged.

Clams get their food by Clams get their food by filtering it from the water. filtering it from the water. It has a tube like part that It has a tube like part that

is used for feeding.is used for feeding.

Mussels are a type of bivalve

Scallops are also bivalve! They have dozens of eyes and can swim around by squirting water as a jet!

Another two shelled mollusk is the oyster.

A BRIGHT BLUE CLAM

SNAILS

SNAILS HAVE ONE SHELL AND A HARD TRAP DOOR

WHICH COVERS THE OPENING OF THE SHELL.

Snails come in many shapes and sizes…

Another cool snail, check out that foot!

THIS MIGHT BE A SNAIL YOU ARE FAMILIAR WITH!

A slug-I have no shell!

A well camouflaged slug

Why do you think they call this one a lettuce slug?

Some slugs (called nudibranchs) are pretty wild!

SQUID-their foot is divided into 8 SQUID-their foot is divided into 8 tentaclestentacles

We call them We call them cephalopods.cephalopods.

SQUIDS – Do not have shells covering the outside of their body. The squid

has a small thin shell inside the body.

The cuttlefish is a type of squid.

A Southern Reef squid…

A bobtail squid!

ANOTHER TYPE OF SQUID

The OCTOPUS isalso a cephalopod!

The octopus does not have a shell covering the outside of the body. Check out the row of suckers!

Can you see the octopus?

Their skin color is light sensitive and can change color rapidly to blend in with its surroundings.

The chambered nautilus (another cephalopod)has a snail like shell but tentacles like a squid.

A collection of shells

Interesting bivalve shells

FUN MOLLUSK FACTS Mollusks have been around for Mollusks have been around for

over 500 million years!over 500 million years! Some oysters change from male to Some oysters change from male to

female every other year!female every other year! 99% of snail species have shell 99% of snail species have shell

whorls that coil in a clockwise whorls that coil in a clockwise direction.direction.

Many bivalves can make pearls Many bivalves can make pearls when a foreign substance enters when a foreign substance enters their shells, they coat the object their shells, they coat the object with a shell like material until it is with a shell like material until it is round. This can take 2 years!round. This can take 2 years!

THE END!!

BYE BYE!!BYE BYE!!By Marta Howard and Julie Hunt, Degan

Elementary