Mollusks

Front 1

Foot

Back 1

Comes in various forms. Used for crawling or burrowing. Can be divided into tentacles.

Front 2

Mantle

Back 2

A thin layer of tissue that covers most of the mollusk's body and has glands that secrete the shell.

Front 3

Shell

Back 3

Calcium carbonate. Some mollusks have a reduced shell or no shell. Used for protection.

Front 4

Visceral mass

Back 4

A lump of all the mollusk's internal organs.

Front 5

Radula

Back 5

A chainsaw like tongue used for feeding that can come in many forms.

Front 6

Class Gastropoda characteristics and examples

Back 6

Has one shell or no shell. Moves with a muscular foot on the ventral side. Ex: moonsnail, slug, snail, limpet, nudibranch

Front 7

Class Bivalvia characteristics and examples

Back 7

They have 2 shells that are held together by powerful adductor muscles. 2 siphons regulate filter feeding, the incurrent and the excurrent siphons. They have an open circulatory system which means that blood pools in the sinuses. Ex: clam, oysters, mussels, geoduck, scallops

Front 8

Class Polyplacophora characteristics and examples

Back 8

8 fused shells. Scraps algae with radula. Ex: chiton.

Front 9

Class Scaphopoda characteristics and examples

Back 9

Long thin shells that look like teeth or tusks. Ex: tusk shells

Front 10

Class Cephalopoda characteristics and examples

Back 10

Soft bodied mollusks in which the head is attached to a single foot. The foot is divided into tentacles. Ex: Octopus, squid, cuttlefish, nautilus

Front 11

How are cephalopods more advanced than bivalves?

Back 11

They have numerous complex sense organs that help them detect and respond to external stimuli. They distinguish things by sight and by touch. They have camouflage, and complex eyes.

Front 12

How do some mollusks defend themselves?

Back 12

Snails: Retract into their shells when they detect danger.

Octopi: Camouflage themselves to keep away from danger.

Mussels: Use powerful mussels to keep their shells closed so that other animals don't eat their organs.

Slugs: Hide from predators under rocks or logs.

Front 13

Human uses/ecological role of mollusks.

Back 13

1. Important food source to many organisms, including humans

2. They can be used to monitor water quality.

3. They clean their surroundings by filterfeeding algae or by eating detritus.

4. Some are hosts to symbiotic algae or parasites.