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Mollusks

Mollusks. Chapter 13 Section 1 Notes. Mollusks. Soft-bodied invertebrates with bilateral symmetry and usually one or two shells with organs in a fluid-filled cavity. Mantle. Thin layer of tissue called the mantle covers the body organs. Mantle.

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Mollusks

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  1. Mollusks Chapter 13 Section 1 Notes

  2. Mollusks • Soft-bodied invertebrates with bilateral symmetry and usually one or two shells with organs in a fluid-filled cavity.

  3. Mantle • Thin layer of tissue called the mantle covers the body organs.

  4. Mantle • Mantle cavity (between soft body and mantle) contains gills.

  5. Open Circulatory System • For most mollusks, an open circulatory system moves blood through vessels and into open spaces around body organs.

  6. Mouth • Well-developed head has a mouth and some sensory organs • Underside is a muscular foot used to move.

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

  8. Gastropod • Usually have a single shell • Include snails, conchs, and garden slugs • Use radula (tongue like organ with rows of teeth) to get food. • Some have foot glands that secret layer of mucus for sliding

  9. Bivavles • Have hinged, two-part shell and include clams, oysters and scallops

  10. Cephalopods • Most specailized and complex mollusk • Include squid, ocotopuses, cuttlefish, and chambered nautiluses • Have a well-developed head and many tentacles for capturing prey • Closed circulatory system moves blood through the body in a series of closed vessels • Cephalopods use jet propulsion to move at speeds of 6 m/s • Mollusk fossils date to more than 500 million years ago.

  11. Uses of mollusks • Provide food for people and other animals as well as pearls and shells for jewelry and decorations.

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