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Mollusks. Notes 2-5-13. Mollusks. Mollusks are classified into three common groups based on shell presence, shell type, and foot type. Bivalves Gastropods Cephalopods. Bivalves. Bivalves have a hinged two-part shell without a head or teeth .

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mollusks

Mollusks

Notes

2-5-13

mollusks1
Mollusks
  • Mollusks are classified into three common groups based on shell presence, shell type, and foot type.

Bivalves

Gastropods

Cephalopods

bivalves
Bivalves
  • Bivalves have a hinged two-part shell without a head or teeth.
  • Bivalves dig deep into the soil by using their muscular foot.
  • Mussels and oysters attach themselves with a strong thread to keep from floating away with the currents & waves
bivalves1
Bivalves
  • Examples:

Clam

Oyster

Scallop

Mussels

gastropods
Gastropods

1. One shelled.

2. Some have a muscular foot that secrets a layer of mucus for sliding along.

3. They use a Radula(tongue like organ) to get their food.

4. Many have two tentacles with eyes at the tips.

gastropods1
Gastropods
  • Examples:

Snails

Conchs

Garden Slug(Exception No shell)

Abalones

Whelks

cephalopods
Cephalopods
  • These are the most complex and specialized .
  • They have a well developed head and many tentacles for capturing prey.
  • They have a closed circulatory system.
  • They use jet propulsion to move rapidly.
cephalopods1
Cephalopods
  • Examples:

Octopus

Squid

Cuttlefish

Chambered Nautiluses

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