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Mollusca

Mollusca. Three Classes. Gastropoda (gastropods)~ slugs and snails Bivalvia (bivalves) ~ clams and other two-shelled shellfish Cephalopoda (cephalopods) ~ squids, octopuses and cuttlefish. Bodies of Mollusks. A mollusk has a soft body which is usually covered by a hard outer shell.

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Mollusca

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  1. Mollusca

  2. Three Classes • Gastropoda (gastropods)~ slugs and snails • Bivalvia (bivalves) ~ clams and other two-shelled shellfish • Cephalopoda (cephalopods) ~ squids, octopuses and cuttlefish

  3. Bodies of Mollusks • A mollusk has a soft body which is usually covered by a hard outer shell. • Exceptions: • Slugs and octopuses have lost their shells through evolution • Squids have very reduced shells

  4. Anatomy of a Mollusk • All mollusks have: • Foot ~ the muscular foot helps it move • Visceral mass ~ contains the gills, gut, and other organs • Mantle ~ covers the visceral mass to protect the mollusks without shells • Most mollusks have: • Shell ~ protects the mollusk from predators and keeps land mollusks from drying out.

  5. Symmetry of Mollusks • Mollusks have bilateral symmetry. • The two halves of the body mirror each other.

  6. Anatomy of a Snail (gastropod)

  7. Anatomy of a Clam (bivalve)

  8. Anatomy of a Squid (cephalopod)

  9. Eating Behaviors • Bivalves (clams) ~ filter tiny plant and bacteria from the water • Gastropods (snails) ~ eat with a radula (tiny tongue covered with teeth. • The radula is used to scrape algae off rocks and pieces of leaves and seaweed • Cephalopods (squid) ~use tentacles to grab their prey and put it in their powerful jaws.

  10. Blue-ringed octopus

  11. Market Squid

  12. Moon Snail chasing its food

  13. Achatina fulicaGiant African Land Snail The largest land snail known is the Giant African Land Snail. It can weigh up to 2 pounds and be 15 inches long.

  14. Commonly Eaten Mollusks cockles conch oysters clams scallops abalone whelks Mussels Pen shells

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