Marine 2 21-12
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Marine 2 21-12

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Marine 2 21-12 Presentation Transcript

  • 1. Marine Worms Flatworms, Annelids, & Polychaeates
  • 2. Evolution in progress!!
    • Going from sponges
      • Multi cellular
        • No sensory organs
        • No locomotion
        • No cognitive functioning
        • No organs
      • Sessile
      • Asymmetrical
  • 3. To Worms!
    • organ level of organization!
      • What organs did you find in the worksheet?
    • Bilateral symmetry
    • Cephalization
      • Beginnings of a brain
    • Locomotion
    • Active predators
  • 4. Phylum platyhelminthes Class turbellaria
  • 5. Flatworms!
    • Cephalization
      • Can detect light, chemicals, and movement
    • Locomotion
      • Covered with a layer of cells called the epidermis
      • Ventral surface of epidermis produces mucus
  • 6. Flatworms
    • Digestion:
      • Heterotrophs
        • Crustaceans, snails, annelid worms
        • Bodies of dead animals
        • Diatoms
          • Why is it more beneficial to eat diatoms?
  • 7. Active predators
    • Entangle prey in mucus
      • Suffocates
    • Stab prey with a pharynx
      • Pumps out enzymes
      • Sucks out body fluids
    • Gastrovascular cavity
      • What do the branches in the cavity do for the organism?
  • 8. Flatworms
    • Reproduction
      • Asexually and sexually
        • regeneration
    • Reciprocal copulation
      • Hermaphrodites
      • Exchange both sperm and egg
  • 9. Tapeworms
    • Parasitic
      • Live in digestive tract
      • Can be huge
    • No digestive tract or nervous tissue
    • Passed through intermediate hosts
      • Can be deadly
    • Attach to host using a scolex
  • 10. Phylum Annelida
    • Segmented worms
  • 11. Annelids
    • Worms whose bodies are divided internally and externally into segments
    • Heterotrophs
      • Take in nutrients from the soil
      • help to filter nutrients
  • 12. Structure of annelids
    • Bilateral
      • Fluid filled: hydrostatic skeleton
    • Longitudinal and circular muscles to help with locomotion
    • Setae:
      • bristles on skin that help movement
    • Cerebral ganglia
    • Gas exchange occurs across the skin
  • 13. Digestion
    • Food enters body through the pharynx
      • Organic nutrients are digested in the intestine
    • Nutrients are stored in the crop
    • Help to filter nutrients in the soil
  • 14. Class polychaetes
  • 15. Tube like worms
    • Live in sand mud, corals, shells
    • Bury themselves in the sand and project only their jaws or tentacles out of their tubes
  • 16. Structure
    • Light sensors
      • pull themselves back in their tubes
    • Tentacles
      • Use cilia to strain food and release wastes
    • Tubes
      • Protective
      • Made of calcium, carbon,
      • Structure
  • 17. Digestion
    • Digestive tract running straight through
      • Usually two openings
      • Or turn themselves inside out to release wastes
  • 18. Reproduction
    • Asexual:
      • regeneration, budding
    • Sexual:
      • Epitoke: pelagic reproduction
        • Release millions of sperm and eggs all in one night
  • 19.  
  • 20.  
  • 21.