11. Worm Phyla Notes

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11. Worm Phyla Notes

  1. 1. WORMS!!!!! Phylum Platyhelminthes Phylum Nemertea Phylum Nematoda Phylum Annelida
  2. 2. Bilateral Symmetry <ul><li>Arrangement of body parts in such a way that there is only one way to cut the body and get two identical halves </li></ul>
  3. 3. Orientation <ul><li>Anterior – front </li></ul><ul><li>Posterior – rear or back </li></ul><ul><li>Dorsal – back </li></ul><ul><li>Ventral - belly </li></ul>
  4. 4. Bilateral Charact. <ul><li>Bilateral symmetry allows for the following: </li></ul><ul><li>A head with a brain </li></ul><ul><li>More active pursuit of prey </li></ul><ul><li>Body has specialized tissues and organs </li></ul><ul><li>More sophisticated behaviors </li></ul>
  5. 5. Phylum Platyhelminthes <ul><li>“ Flatworms” </li></ul><ul><li>Dosrsoventrally flattened (flat backs and bellies) </li></ul><ul><li>Simplest organisms whose tissues are organized into real organs and organ systems </li></ul>
  6. 6. Phylum Platyhelminthes <ul><li>Has a central nervous system with a simple brain and nerve cords along the body </li></ul><ul><li>There is a well developed muscular system, reproductive, and digestive system </li></ul>
  7. 9. Phylum Platyhelminthes <ul><li>a) Can be carnivorous </li></ul><ul><li>b) Can live inside or on the surface of organisms </li></ul><ul><li>c) Parasites such as flukes and tapeworms </li></ul>
  8. 10. Phylum Nemertea <ul><li>“ Ribbon worms” </li></ul><ul><li>Look like long flat worms </li></ul><ul><li>One measured at 30m long </li></ul>
  9. 11. Phylum Nemertea <ul><li>Defining characteristics: </li></ul><ul><ul><li>Complete digestive tract: mouth, gut, anus </li></ul></ul><ul><ul><li>Presence of a circulatory system </li></ul></ul><ul><ul><li>Most distinctive feature is a probiscus </li></ul></ul><ul><ul><li>All predators that feed on worms and crustaceans </li></ul></ul>
  10. 12. Proboscus <ul><li>A long, fleshy tube used to entangle prey </li></ul><ul><li>Everted from a cavity above the mouth like a finger in a glove </li></ul>
  11. 13. Phylum Nematoda <ul><li>“ Roundworms” or Nematodes </li></ul><ul><li>Live in sediments or the tissues of other organisms (parasites) </li></ul><ul><li>Slender, cylindrical bodies are typically pointed at both ends </li></ul>
  12. 14. Phylum Nematoda <ul><li>Hydrostatic skeleton that provides support and locomotion </li></ul><ul><li>Larva can be found in raw fish which is in turn ingested by humans </li></ul>
  13. 16. Phylum Annelida <ul><li>“ Segmented Worms” </li></ul><ul><li>Body consists of a series of segments (think earthworm) </li></ul><ul><li>Gut goes through all segments </li></ul><ul><li>Contain a central cavity known as a coelom </li></ul>
  14. 17. Phylum Annelida <ul><li>Closed circulatory system – blood always stays in blood vessels </li></ul><ul><li>Typically burrowers </li></ul><ul><li>Includes Leeches </li></ul>

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