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Molluscs

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Molluscs

  1. 1. Molluscs
  2. 2. Phylum Mollusca <ul><li>Phylum Mollusca includes snails and slugs, oysters and clams, and octopuses and squids (~100,000 different species). </li></ul>
  3. 3. Comparative Embryology <ul><li>Molluscs have a mesoderm lined body cavity – a coelom . </li></ul><ul><li>Lophotrochozoans </li></ul>
  4. 4. Humans & Molluscs <ul><li>Humans use molluscs in a variety of ways: </li></ul>
  5. 5. Humans & Molluscs <ul><li>A few are pests or introduced nuisances: </li></ul>
  6. 6. Mollusc Body Plan
  7. 7. Head-Foot Region
  8. 8. Head-Foot Region
  9. 9. Head-Foot Region
  10. 10. Shells
  11. 11. Mantle Cavity
  12. 12. Internal Structure & Function
  13. 13. Mollusc Life Cycle <ul><li>Most molluscs are dioecious, some are hermaphroditic. </li></ul><ul><li>The life cycle of many molluscs includes a free swimming, ciliated larval stage called a trochophore . </li></ul><ul><ul><li>Similar to annelid larvae. </li></ul></ul>
  14. 14. Mollusc Life Cycle <ul><li>The trochophore larval stage is followed by a free-swimming veliger larva in most species. </li></ul>
  15. 15. Major Mollusc Classes <ul><li>Four major classes of molluscs: </li></ul><ul><ul><li>Class Polyplacophora – the chitons </li></ul></ul><ul><ul><li>Class Gastropoda – snails & slugs </li></ul></ul><ul><ul><li>Class Bivalvia – clams, mussels, oysters </li></ul></ul><ul><ul><li>Class Cephalopoda – octopus & squid </li></ul></ul>
  16. 16. Bivalvia Class
  17. 17. Cephalopod Class Show squid video
  18. 18. Videos Giant Squid Slug Sex

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