phylum platyhelmenthes planarians flukes tapeworms
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Phylum Platyhelmenthes Planarians, Flukes, & Tapeworms. Simple acoeleomates Bilaterally symmetrical Most flattened "Dorsoventrally" Divided into 4 classes:. Class Turbellaria. Most free-living and non parasitic Include planarians Lack circulatory and gas-exchange organs.

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phylum platyhelmenthes planarians flukes tapeworms

Phylum PlatyhelmenthesPlanarians, Flukes, & Tapeworms

Simple acoeleomates

Bilaterally symmetrical

Most flattened "Dorsoventrally"

Divided into 4 classes:

class turbellaria
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
class trematoda flukes
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.
liver flukes cont d
Liver Flukes Cont’d…

Liver Fluke

Liver Fluke encysted in a liver

class cestoda tapeworms
Class Cestoda (Tapeworms)
  • Parasitic flatworms
  • Can grow to enormous lengths (up to 20m)
  • Parasitize mostly vertebrate hosts
  • Attach head named scolexto 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.
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