Mollusks
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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

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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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