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Phylum Nematoda

Phylum Nematoda. Roundworms. Summary of Phylum Characteristics. Where do they live? Land, lakes, streams and in all oceans What kind of symmetry do they have? Bilateral Are they all parasitic? Only 50 or so of 12,000 species are parasitic Give examples of some of the parasitic worms

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Phylum Nematoda

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  1. Phylum Nematoda Roundworms

  2. Summary of Phylum Characteristics • Where do they live? • Land, lakes, streams and in all oceans • What kind of symmetry do they have? • Bilateral • Are they all parasitic? • Only 50 or so of 12,000 species are parasitic • Give examples of some of the parasitic worms • Ascaris, Trichina, Filaria, Pinworms, Hookworms

  3. Body plan/Tissue Description • tapering at both ends; unsegmented worms • 3 layers: • Endoderm • Ectoderm • Mesoderm

  4. Body plan/Tissue Description • Pseudocoelom • Fluid-filled body cavity in direct contact with the digestive tract. • Respiratory or circulatory system • No; depend on diffusion

  5. How does it reproduce? • Well-developed reproductive systems • Sexes are separate • Fertilization occurs within the body of the female • Eggs can be deposited in the soil or fecal matter

  6. How does it get nutrients? • Roundworms have two openings: a mouth and an anus • Roundworms have a complete digestive system

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