Phylum Annelida

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Phylum Annelida

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

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