Phylum Platyhelmenthes Planarians, Flukes, - PowerPoint PPT Presentation

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Phylum Platyhelmenthes Planarians, Flukes,

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Phylum Platyhelmenthes Planarians, Flukes, & Tapeworms Simple acoeleomates Bilaterally symmetrical Most flattened – PowerPoint PPT presentation

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Title: Phylum Platyhelmenthes Planarians, Flukes,


1
Phylum PlatyhelmenthesPlanarians, Flukes,
Tapeworms
  • Simple acoeleomates
  • Bilaterally symmetrical
  • Most flattened "Dorsoventrally"
  • Divided into 4 classes

2
Class Turbellaria
  • Most free-living and non parasitic
  • Include planarians
  • Lack circulatory and gas-exchange organs.
  • Simple excretory structures called flame cells
    that maintain osmotic balance.
  • Is cephalized and has eye-spots which are
    sensitive to light
  • Feeds through ventral feeding tube called a
    pharanx
  • Can reproduce sexually, or asexually through
    regeneration

3
Planarian and assorted marine flatworms
4
Class Trematoda (Flukes)
  • Similar in form to turbillarians
  • Many are parasitic. Example of parasitic fluke is
    the asian liver fluke
  • Many have complex life cycles including multiple
    hosts and alternation of generations.

5
Life Cycle of the Liver Fluke
6
Liver Flukes Contd
Liver Fluke
Liver Fluke encysted in a liver
7
Class Cestoda (Tapeworms)
  • Parasitic flatworms
  • Can grow to enormous lengths (up to 20m)
  • Parasitize mostly vertebrate hosts
  • Attach head named scolex to intestinal walls of
    host, and abosrb host's nutrients
  • Following scolex is a series of repeating
    structural units called proglottids
  • Mature proglottids containing thousands of eggs
    are released with the host's feces to infect
    other organisms.

8
Tapeworms contd
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