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The Worms

The Worms. The Worms. Phylum Platyhelminthes Phylum Nematoda Phylum Annelida. Characteristics of Worms. Soft-bodied, long, legless Bilateral symmetry Cephalization—having an anterior end with nerve tissue. Phylum Platyhelminthes “the flatworms”. Free-living: planarians

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The Worms

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  1. The Worms The Worms Phylum Platyhelminthes Phylum Nematoda Phylum Annelida

  2. Characteristics of Worms • Soft-bodied, long, legless • Bilateral symmetry • Cephalization—having an anterior end with nerve tissue

  3. Phylum Platyhelminthes“the flatworms” • Free-living: planarians • Parasitic: tapeworms, flukes

  4. Planarians • Epidermis • Gastroderm • Mesoderm

  5. Planarians • Planarians move by-- • Planarians eat by-- • Planarians get rid of soluble waste by--

  6. Planarians • Planarians’ nervous system consists of-- • Planarians reproduce by--

  7. Characteristics of Parasitic Flatworms • Few sensory organs as adults • No external cilia in adults • A thick tegument • Have suckers, hooks, or both for attachment

  8. The Flukes • Sheep liver fluke • Causes liver rot

  9. The Tapeworms • Scolex • the head region • Proglottids • segments that grow from behind the scolex; contain a complete set of reproductive organs

  10. The Tapeworms • Intermediate host • an animal that temporarily harbors the immature form of a parasite

  11. Phylum Nematoda (round & unsegmented) “the roundworms”

  12. Ascaris A typical roundworm

  13. Ascaris ONLY reproduces sexually & is NOT hermaphroditic

  14. Other Roundworms • Hookworm • Incubate in warm soil • Preventing infections: • Proper elimination of wastes • Wear shoes!! • Trichina worm • Pinworm

  15. Phylum Annelida “little rings” Segmented worms (septa)

  16. Annelida • Clitellum • Prostomium • Casts • Setae • Crop • Gizzard • Aortic arches • Nephridia

  17. What does “Annelida” mean? • Flat worm • Segmented worm • Little rings • Two sides

  18. What is the term for the membranes that divide earthworms into segments? • Septa • Nephridia • Setae • Proglottids

  19. Which structures aid the earthworm in movement? • Septa • Setae • Nephridia • Prostomia

  20. What is the muscular organ that grinds soil and breaks it into small pieces? • Prostomium • Gizzard • Crop • Clitellum

  21. The earthworm respires through its • cuticle and epidermis. • nephridia. • aortic arches. • mouth.

  22. Earthworms have an open circulatory system. • True • False

  23. The structures responsible for the removal of soluble wastes • Aortic arches • Kidneys • Nephridia • Blood

  24. Earthworms are hermaphroditic. • True • False

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