Phylum Mollusca

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  1. Characteristics of the Phylum Mollusca (5)
    • Soft body
    • Bilateral symmetry
    • Triploblastic
    • Alimentary Canal
    • Sexual Reproduction
  2. Unique Characters of Phylum Mollusca (3)
    • Radula¬†
    • Muscular foot
    • Mantle
  3. Shared Molluscan features (4)
    • Venral muscular foot
    • Radula
    • Veisceral Mass
    • Dorsal Mantle
  4. Dorsal Mantle of Mollusca
    Cell layer that secretes shell
  5. Radula
    Predation & defense
  6. Mantle Cavity
    Houses gills/lungs that develop from the mantle & through which water is pumped through
  7. What does the mantle cover?
    Visceral mass
  8. Molluscan gas exchange (3)
    • Occurs within the mantle cavity
    • Cutaneous respiration
    • Use gills (ctenidia)
  9. Feeding & Digestion (2)
    • Complete digestive system
    • Varied food sources
  10. Class Gastropoda (2)
    • Snails, abalones
    • One spiraled shell
  11. Land snails (2)
    • Gills don't work well
    • Lining of mantle cavity functions as lung
  12. Land slugs (2)
    • Hermaphrodites/ impregante each other
    • Have elaborate mating rituals
  13. Class Bivalvia (5)
    • Clams/Oysters
    • Shells have two halves
    • No head or radula
    • Most are sessile
    • Use muscular foot to bury themselves
  14. Bivalve Feeding
    • Water drawn in through incurrent siphon
    • Passes over ctnedia and the food particles in water are captured
  15. What bivalve body part allows water in and out?
  16. Bivalve Adaptations (3)
    • Soft bottom habitat (clams burrow into sand)
    • Rocky intertidal habitats (mussels attach to rocks)
    • Underwater rock surfaces (Oysters secrete "cement")
  17. What do mussels use to attach themselves to rocks?
    Byssal threads
  18. Class Polyplacophora (4)
    • Chitons
    • Eight shell plates
    • Radula scrapes algae
    • Attach to rocks with their foot
  19. What does Cephalopod mean?
  20. What happens to the gastropod foot?
    Modified to muscular siphons, head, tentacles
  21. Cephalopod Characteristics (4)
    • Active predators with beak-like jaws
    • Well developed nervous system with a brain
    • Excellent vision
    • Can change skin colors
  22. Chromatophores
    Specialized pigment cells that cephalopods use to change skin colors
  23. The Nautilus (2)
    • Ancient, deep water cephalopod
    • Moves up and down water column by regulating amount of gas in chambers
  24. Squid (4)
    • Pelagic
    • Grasp prey and mates with tentacles
    • Fins act as rudders
    • Shell reduced to stiff internal pen
  25. Octopus (4)
    • Crawl
    • 8 arms
    • Shell completely lost
    • most advanced and complex nervous system
  26. Where are most of the neurons in an octopus found?
    In their arms
  27. How do octopuses use vision other than for predatory purposes?
    Vision is used in sexual courtship, and social communication
  28. What is an analogous structure of the octopus?
    Camera lens eye- similar to vertebrate eye, but it evolved independently
  29. What is a something that octopus adopted?
    A highly specialized nervous system for hunting and surviving
  30. Are octopuses intelligent? (5)
    • Use tools for defense
    • Can solve problems
    • Show long-term memory
    • Play
    • Can recognize human caretakers
  31. How are octopuses similar to humans? (2)
    • Adapted a highly specialized nervous system for hunting and surviving
    • Solitary, short lived animals

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Phylum Mollusca
2015-11-03 07:25:07
zoology mollusca
phylum mollusca
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