Lecture4NemaPlaty1 - Lecture Topic Nematoda and...

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Nematoda and Platyhelminthes Slide 1 Lecture Topic: Nematoda and Platyhelminthes (aka roundworms and flatworms) Reading: Invertebrates, CHAPTER 33, pages 638-670.
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Nematoda and Platyhelminthes Slide 2 phylum Nematoda (roundworms) also known as Nemata nema from the Greek meaning thread
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Nematoda and Platyhelminthes Slide 3 Figure 32.10, page 635 Calcarea Silicarea Ctenophora Cnidaria Echinodermata Chordata Brachiopoda Phoronida Ectoprocta Platyhelminthes Nemertea Mollusca Annelida Rotifera Nematoda Arthropoda “Radiata” “Porifera” Deuterostomia Lophotrochozoa Ecdysozoa Bilateria Eumetazoa Metazoa Ancestral colonial flagellate molecules Who are nematodes related to?
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Nematoda and Platyhelminthes Slide 4 triploblasts bilaterally symmetrical round in cross-section, unsegmented gut is complete covered by a tough coat called a cuticle which is periodically molted inhabit marine, freshwater, and terrestrial environments; some are free-living, some parasitic 25 µm Figure 33.26, page 655
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Nematoda and Platyhelminthes Slide 5 stylized cross section of female nematode
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Nematoda and Platyhelminthes Slide 6 Mature nematode
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Nematoda and Platyhelminthes Slide 7 Caenorhabditis elegans
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Nematoda and Platyhelminthes Slide 8
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Nematoda and Platyhelminthes Slide 9 Some species of nematodes are important parasites of plants and animals 50 µm Encysted juveniles Muscle tissue Figure 33.27, page 656
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Nematoda and Platyhelminthes Slide 10 Nematodes infecting animals: Ascaris lumbricoides is 50 - 80 µm in diameter, but up to 40 cm long, infects human small intestine, up to 5,000 worms in a single host.
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  • Fall '06
  • 11:00-01:50pm
  • Evolution, Phylum, Annelid, Flatworm, Nematoda, Platyhelminthes Slide

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