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Platyhelminthes : The Flatworms

Platyhelminthes : The Flatworms. Platyhelminthes : The Flatworms . What makes something a planarian (member of phylum platyhelminthes )? Bilateral symmetry cephalization Single digestive opening (pharynx) Respire via diffusion Triploblastic body plan. Bilateral Symetry.

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Platyhelminthes : The Flatworms

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  1. Platyhelminthes: The Flatworms

  2. Platyhelminthes: The Flatworms • What makes something a planarian (member of phylum platyhelminthes)? • Bilateral symmetry • cephalization • Single digestive opening (pharynx) • Respire via diffusion • Triploblastic body plan

  3. Bilateral Symetry

  4. Pharynx: Mouth on a tube Cephalization Pharynx Mouth

  5. Poor Flat-worm! No Anus! (single digestive opening)

  6. Respiration: No Lungs… just diffusion • That’s why they’re flat! More surface area for diffusion

  7. Platyhelmintheshave 3 cell layers

  8. Human Germ Layers • Ectoderm : skin + nerve system • Endoderm : digestive & respiratory organs • Mesoderm : everything else (heart, kidneys, muscles, etc.)

  9. Cell Layers

  10. Anatomy of a Flatworm

  11. Types of Platyhelminthes • There are 3 groups of platyhelminthes • Planarians • Flukes • Tapeworms

  12. Planarians: Free living nice guys • Predators. Usually aquatic

  13. Flukes: Parasites with Multiple Hosts • Fluke are obligate pathogens. • They have complex life cycles which require infection of multiple hosts.

  14. Tapeworms • Parasites.

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