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  • 1. PHYLUM ANNELIDA
  • 2. ANNELIDA=>
    • “ segmented worms”
    • often hermaphroditic
    • True coelom
    • Digestive tract
  • 3. ANNELIDA=>
    • most marine species in class: Polychaeta
    • either free-swimming or “fanworms”
  • 4. ANNELIDA=>
    • fanworms are tube-dwellers that have tentacles for filter-feeding
  • 5. “ Christmas Tree” worms
  • 6. ANNELIDA=>
    • free-swimming annelids have a pair of parapodia on each segment
    • usually powerful, pincherlike jaws: (sandworms & clamworms)
  • 7. ANNELIDA - “fireworm”
  • 8. ANNELIDA - “clamworm”
  • 9. The EARTHWORM:
    • Class: Oligochaeta
  • 10.  
  • 11. The EARTHWORM:
    • MOVEMENT:
      • 1) posterior setae anchor
      • 2) circular muscles contract
      • 3) anterior setae anchor
      • 4) circular muscles relax and longitudinal muscles contract
    • *muscles contract against “hydrostatic skeleton”
  • 12.  
  • 13. The EARTHWORM:
    • EXCRETION:
      • NEPHRIDIA - long tubules that excrete liquid waste
  • 14. The EARTHWORM:
    • DIGESTION:
      • “ MOUTH” (opening)
      • PHARYNX (acts as a soil pump)
      • CROP (temp. storage organ)
      • GIZZARD (grinds up soil)
      • INTESTINE (nutrients are absorbed)
      • ANUS (exit)
  • 15. The EARTHWORM:
  • 16.  
  • 17. The EARTHWORM:
    • RESPIRATION & CIRCULATION:
      • no special resp. structures
      • breathe through moist skin
      • blood flows from anterior (ventral blood vessel) to posterior (dorsal blood vessel)
      • AORTIC ARCHES - 5 pairs of muscular vessels at ant. end “hearts”
  • 18.  
  • 19.  
  • 20. The EARTHWORM:
    • RESPONSE:
      • small “brain” of fused GANGLIA
      • ventral nerve cord
      • poor sensory organs
  • 21. The EARTHWORM:
    • REPRODUCTION:
      • are hermaphrodites
      • cannot fertilize own eggs
      • young hatch in 2 - 3 weeks
  • 22. LEECHES:
    • Class: Hirudinea
      • have no setae nor parapodia
      • most are parasites
      • most dwell in fresh water
  • 23. LEECHES:
    • Class: Hirudinea
      • one pair suckers
      • muscular pharynx w/ razor-sharp teeth
      • anti-coagulant & pain-numbing saliva
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  • 27.