Phylum Platyhelminthes

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Phylum Platyhelminthes

  1. 1. Phylum Platyhelminthes Flatworms
  2. 2. Characteristics <ul><li>Bilaterally symmetrical - Mirrored right and left sides </li></ul><ul><li>Tripoblastic - Bodies have 3 cell layers </li></ul><ul><ul><li>Epiderm / Ectoderm (outside) </li></ul></ul><ul><ul><li>Mesoderm (middle) </li></ul></ul><ul><ul><li>Endoderm (inside) </li></ul></ul><ul><li>Organs – Reproductive, Musculature, Excretory </li></ul><ul><li>Cephalization – concentration of nervous tissue at anterior. </li></ul><ul><li>Pharynx – Combined mouth and anus </li></ul>
  3. 3. Classification <ul><li>1. Class Turbellaria – “Free-living” flatworms </li></ul><ul><li>Ex. Planaria </li></ul><ul><ul><ul><li>Most, some fresh water, some terrestrial. </li></ul></ul></ul>Marine planaria Freshwater planaria Parasitic Terrestrial planaria
  4. 4. <ul><li>2. Class Trematoda - Parasitic flukes </li></ul><ul><li>Ex. Liver Flukes, Blood Flukes </li></ul>Sheep Liver Fluke Human Blood Fluke
  5. 6. <ul><li>3. Class Cestoda - </li></ul><ul><li>Ex. Parasitic Tapeworms </li></ul>
  6. 7. Tapeworm Anatomy Scolex - Head Proglottid - Segment
  7. 8. Tapeworm Anatomy (Cont’d)
  8. 9. Tapeworm Lifecycle

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