Mollusca “soft bodied”

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Siobhan
ID:
120411
Filename:
Mollusca “soft bodied”
Updated:
2011-12-03 12:11:28
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Mollusca “soft bodied”
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Mollusca “soft bodied”
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  1. Characteristics
    of
    Molluscs
    • Mantle and muscular foot
    • Ubiquitous
    • Complex digestive system
    • Radula
    • Nervous system with sensory organs
    • Sexual reproduction
    • Hemocoel - open
    • circulatory system
    • with
    • heart, blood vessels, blood
    • Trochophore larvae
    • Sensory organs including complex eyes
    • Mono- and dioecious

  2. The
    Mantle

    • Gas exchange
    • Respiratory
    • organs/surfaces
    • Excreta location
    • Products
    • of digestion released here
    • Eggs/sperm
    • released here
    • Aquatic organisms
    • Water
    • pumped through by cilia
    • Sensory
    • organs
    • Cephalopods (squid, octopuses)
    • Mantle
    • is muscular
    • Used
    • in locomotion
    • Secretes shell (and makes pearls!)

  3. Gastropods:
    Snails and Slugs

    • “stomach foot”
    • Largest, most diverse class of molluscs
    • Sessile or sedentary
    • Can be shell-bearing
    • Operculum for closing shell

  4. What’s
    that shell for?

    • Protection
    • Predation
    • Water
    • loss
    • Environmental
    • fluctuations
    • Features of the shell:
    • Usually
    • dextral or
    • right-handed
    • Grows
    • with the animal
    • Sometimes
    • has pores for water/gas exchange
    • 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. Snail
    Radula

    • The Sundance Channel presents:
    • Reproduction in
    • Crepidula
    • fornicata
    • (for fun)

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

  8. Bivalve
    Reproduction

    • Separate sexes
    • External fertilization (mostly)
    • 3 larval stages
  9. 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

  10. 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

  11. Cephalopod
    Reproduction

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

  12. Cephalopod
    Behavior

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

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