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Worms

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  1. Worms • Three main Phyla • Phylum Platyhelminthes - flatworms • Phylum Nematoda – roundworms • Phylum Annelida – segmented worms

  2. Phylum Platyhelminthes • Flatworms • Planaria, tapeworms, and flukes are examples • Parasites and free living • Planaria = free living • Tapeworm + flukes = parasites

  3. Flukes

  4. Tapeworms • Parasites • Have body sections • Long – extend the length of the digestive system • Scolex = head • Contains suckers and hooks • Primitive – lack some body systems


  5. Planaria

  6. Planaria

  7. Planaria – nervous system

  8. Roundworms

  9. Ascaris lumbricoides – a parasitic roundworm

  10. Segmented worms

  11. Earthworm External Anatomy mouth Body segments clitellum anus

  12. Phylum Annelida • Segmented worms • Earthworm and leeches are examples • Segmented body parts • Closed circulatory system • Mouth and an anus separate

  13. Earthworm mouth and prostomium

  14. Digestive System – Earthworm “alimentary tract” esophagus crop intestine pharynx prostomium mouth gizzard

  15. Leeches leech

  16. A rather large leech on this man’s arm!

  17. Phylum Annelida Leech