3. molluscs chitons and snails
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3. molluscs chitons and snails

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3. molluscs chitons and snails 3. molluscs chitons and snails Presentation Transcript

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