gastropods

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Author:
Siobhan
ID:
122709
Filename:
gastropods
Updated:
2011-12-11 13:45:04
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gastropods
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Description:
gastropods
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  1. Gastropods:
    Snails and Slugs

    • “stomach foot”
    • Largest, most diverse class of molluscs
    • Sessile or sedentary
    • Can be shell-bearing
    • Operculum for closing shell
  2. gastropod shell
    • Protection
    • Predation
    • Water loss
    • Environmental fluctuations
  3. Features of the shell:
    • Usually dextral or right-handed
    • Grows with the animal
    • Sometimes has pores for water/gas exchange
  4. Why do the shells coil?

  5. Gastropod
    Diet

    • All use the radula
    • Scrape algae off rocks
    • Break seaweed
    • abalone
    • Drill holes through bivalves
    • moon snail
    • Cilia in gills collect particles
    • Limpets, slipper snails

  6. Bivalves
    • “Two-shelled”
    • Sedentary
    • Suspension feeders
    • No radula
    • Little cephalization
    • Mostly marine, some freshwater
    • Sensory organs
    • Siphons and/or muscular foot

  7. Bivalve
    Reproduction

    • Separate sexes
    • External fertilization (mostly)
    • 3 larval stages

  8. Ecological
    Importance of Bivalves

    • Invasives (Zebra mussel)
    • Filter water
    • Disease (Paralytic,
    • Amnesic, Neurotoxic Shellfish Poisoning (~30 deaths/yr) Vibrio (~100 deaths/yr)
    • Economic/Food
    • Aquaculture in CT alone several $million/yr
    • Geoducks

  9. Cepholopods
    • “head foot”
    • Squid, octopus, nautilus, cuttlefish
    • All marine
    • Size varies greatly
    • Predaceous
    • Fish, other molluscs, crustaceans, worms
    • Highly mobile
    • Some venomous
    • Jaws with radula
    • Arms or tentacles with or without suckers
    • Large brain (intelligent!)
    • Complex eyes

  10. Cephalopod
    Reproduction

    • Dioecious
    • Male produces spermatophore
    • Often elaborate mating “performances”

  11. Cephalopod
    Behavior

    • Complex brains and eyes
    • Tool-using octopus
    • Mating rituals
    • Ink production for defense

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