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3. molluscs chitons and snails

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3. molluscs chitons and snails

  1. 1. Phylum Mollusca<br />Almost all have the following in common:<br /><ul><li>Shell
  2. 2. Mantle
  3. 3. Foot
  4. 4. Radula</li></li></ul><li>Phylum Mollusca<br />All possess a shell during some stage of their life cycle.<br />Shells are composed of Calcium carbonate.<br />Acidification of our oceans has a potential to dissolve new shell growth.<br />
  5. 5. Phylum MolluscaShell, Mantle, Foot, Radula<br />
  6. 6. Phylum MolluscaChitons - Class Polyplacophora<br />Lined chiton – Tonicella sp.<br />8 shell plate.<br /><ul><li>Bound by a leather girdle so that they can roll up into a ball</li></li></ul><li>Phylum MolluscaChitons - Class Polyplacophora<br />
  7. 7. Phylum MolluscaChitons - Class Polyplacophora<br />
  8. 8. Phylum MolluscaChitons - Class Polyplacophora<br />Mossy chiton- Mopalia sp.<br />Radula for grazing on algae<br />No eyes or tentacles but have light sensors built in their shell<br />
  9. 9. Phylum MolluscaChitons - Class Polyplacophora<br />Teeth capped with magnetite (Iron containing biomineral)<br />
  10. 10. Phylum MolluscaChitons - Class Polyplacophora<br />Katy chiton –<br />Katharina sp.<br />Large foot for movement and creates a suction to hold onto rocks<br />Dioecious (separate sexes) – broadcast spawners.<br />
  11. 11. Phylum MolluscaChitons - Class Polyplacophora<br />Gumboot Chiton<br />Cryptochiton sp.<br />The world’s largest chiton (> 13”)<br />Haida call it SGIIDA “lying face down forever”<br />
  12. 12. Whelks, Nudibranchs and Limpets collectively known as Gastropods<br />
  13. 13. Phylum MolluscaLimpets - Class Gastropoda<br />Tectura sp.<br />Shell torsion lost during development<br />Algae grazers<br />Very territorial with other limpets<br />
  14. 14. Phylum MolluscaLimpets - Class Gastropoda<br />Key hole limpet<br />Diodora sp.<br />
  15. 15. Phylum MolluscaAbalone - Class Gastropoda<br />Haliotis sp.<br />
  16. 16. Phylum MolluscaWhelks and Snails - Class Gastropoda<br />Nucella sp<br />180 o Torsion<br />Shells smooth or fringed (in sheltered waters)<br />Some may develop fringe in the presence of predators<br />Drill and feed on barnacles<br />
  17. 17. Phylum MolluscaWhelks and Snails - Class Gastropoda<br />180o torsion<br />Occurs during early embryo development<br />Advantage - Anterior ctenidia and osphradium<br />Disadvantage – anterior anus <br />
  18. 18. Phylum MolluscaWhelks and Snails - Class Gastropoda<br />Some are carniverous<br />Lirabuccinum sp<br />Euspira sp<br />
  19. 19. Phylum MolluscaWhelks and Snails - Class Gastropoda<br />Predatious Cone snails<br />
  20. 20. Phylum MolluscaWhelks and Snails - Class Gastropoda<br />Fusitriton sp<br />Can use an operculum for protection<br />
  21. 21. Phylum MolluscaWhelks and Snails - Class Gastropoda<br />Dioecious (separate sexes) <br />Some are broadcast spawners<br />For some fertilization is internal.<br />
  22. 22. Phylum MolluscaSea slugs - Class Gastropoda<br />Rostanga sp. and Aeolidia sp.<br />Lost torsion and shell during development<br />Feed on sponges and anemones<br />Incorporate spicules or nematocysts for defense<br />
  23. 23. Phylum MolluscaSea slugs - Class Gastropoda<br />The Sea Lemon<br />Archidoris sp.<br />
  24. 24. Phylum MolluscaSea slugs - Class Gastropoda<br />

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