Worms Galore09

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Worms Galore09

  1. 2. PLATYHELMINTHES=> <ul><li>“ flatworms” </li></ul><ul><li>many marine species are free-living - many not </li></ul><ul><li>simplest creatures w/ bilateral symmetry </li></ul><ul><li>1st to have “cephalization”(head region) </li></ul>
  2. 3. PLATYHELMINTHES=> <ul><li>soft, flattened bodies </li></ul><ul><li>FLAME CELLS => removal of water-soluble waste </li></ul><ul><li>no circulatory or respiratory systems (absorb oxygen through skin) </li></ul><ul><li>hermaphrodites </li></ul><ul><li>includes tapeworms & flukes </li></ul>
  3. 5. Turbellaria Trematoda Cestoda
  4. 6. Class: Turbellaria=> <ul><li>mostly marine (few freshwater) </li></ul><ul><li>soft flattened bodies </li></ul><ul><li>Carnivorous </li></ul><ul><li>May possess eyespots (sense ligght & dark) </li></ul>
  5. 16. flatworm mimicry of a nudibranch
  6. 17. <ul><li>Pseudocerus bifurcus </li></ul>
  7. 18. Class: Trematoda=> <ul><li>“ flukes” </li></ul><ul><li>parasitic </li></ul><ul><ul><li>suckers, tough coverings </li></ul></ul>
  8. 20. sheep intestinal fluke:
  9. 21. human intestinal fluke:
  10. 22. Class: Cestoda=> <ul><li>parasitic (live in dig. tract) </li></ul><ul><li>no mouth, no digestive system, no sense organs </li></ul><ul><li>has a “scolex” </li></ul><ul><ul><li>with suckers & barbs </li></ul></ul>
  11. 24. Class: Cestoda=> <ul><li>absorb nutrients directly through a tough outer covering </li></ul><ul><li>each “proglottid” has a complete hermaphroditic reproductive system </li></ul><ul><ul><li>each proglottid can have 10,000 eggs </li></ul></ul><ul><ul><li>can shed 10 proglottids/day </li></ul></ul>
  12. 25. Pork, beef, and human tapeworm, Taenia sp:
  13. 26. Pork, beef and human tapeworm, Taenia sp:
  14. 28. Phylum NEMATODA=> <ul><li>“ roundworms” </li></ul><ul><li>have a “pseudocoelom” (1st) </li></ul><ul><li>only reproduce sexually (1st) </li></ul><ul><ul><li>usually not hermaphroditic </li></ul></ul><ul><li>Roundworms have a digestive tract with two openings. </li></ul><ul><li>Most roundworms have separate sexes and are covered by a protective cuticle . </li></ul>
  15. 29. Phylum NEMATODA=> <ul><li>1,000,000 per shovelful of topsoil </li></ul><ul><li>free-living species are beneficial </li></ul><ul><li>many are parasites </li></ul>
  16. 31. Phylum Nematoda <ul><li>Ascaris </li></ul><ul><li>The genus Ascaris infects pigs, horses, and humans. </li></ul><ul><li>The eggs enter hosts through contaminated food or water, develop into larvae in the intestines, and can infect the lungs. </li></ul><ul><li>The eggs are spread in the hosts’ feces. </li></ul>
  17. 32. intestinal roundworm of pork & humans, Ascaris sp:
  18. 33. Phylum Nematoda
  19. 34. Phylum Nematoda <ul><li>Hookworms </li></ul><ul><li>Hookworms are intestinal parasites that feed on blood. </li></ul><ul><li>The eggs produce larvae in soil, and the larvae enter hosts through the feet. </li></ul><ul><li>Hookworms infect about one billion people worldwide. </li></ul>
  20. 35. Phylum Nematoda
  21. 36. roundworm parasite causing “ Trichinosis”, Trichinella spiralis:
  22. 37. Phylum Nematoda <ul><li>Other Parasitic Roundworms </li></ul><ul><li>Filarial worms infect many people in tropical countries. The most dangerous ones infect the lymphatic system and may cause elephantiasis . </li></ul>

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