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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.