Biology 27 1 flatworms

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Biology 27 1 flatworms

  1. 1. 27-1 Flatworms
  2. 2. Acoelomate• Animal lacking a coelom, or body cavity
  3. 3. Coelom• Fluid-filled body cavity lined with mesoderm
  4. 4. Pharynx• Muscular tube at the end of the gastrovascular cavity, or throat, that connects the mouth with the rest of the digestive tract and serves as a passageway for air and food.
  5. 5. Flame Cell• Specialized cell that filters and removes excess water from the body of a flatworm.
  6. 6. Ganglion• Group of nerve cells
  7. 7. Eyespot• Group of cells that can detect changes in the amount of light in the environment.
  8. 8. Hermaphrodite• Individual that has both male and female reproductive organs
  9. 9. Fission• Form of asexual reproduction in which an organism splits into two, and each half grows new parts to become a complete organism.
  10. 10. Scolex• Head of an adult tapeworm; can contain suckers or hooks.
  11. 11. Proglottid• One of the segments that make up most of a tapeworm’s body.
  12. 12. testis• Male reproductive organ that produces sperm.
  13. 13. Key Concept• Flatworms are soft, flattened worms that have tissues and internal organ systems. They are the simplest animals to have three embryonic germ layers, bilateral symmetry, and cephalization
  14. 14. Key Concept• Turbellarians are free-living flatworms. Most live in marine or fresh water.
  15. 15. Key concept• Flukes are parasitic flatworms. Most flukes infect the internal organs of their host.
  16. 16. Key Concept• Tapeworms are long, flat, parasitic worms that are adapted to life inside the intestines of their hosts.

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