Phylum PLATYHELMINTHES Platy = Flat Helminth = Worm

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Phylum PLATYHELMINTHESPlaty Flat
Helminth Worm
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CHARACTERISTICS

• All show BILATERAL symmetry
• Posses three tissue (germ) layers
  1. Ectoderm 2. Mesoderm 3. Endoderm
• Most exhibit CEPHALIZATION.
• Majority Do NOT exhibit segmentation

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TYPICAL FLATWORMS
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GETTING FOOD

• Some flatworms are free-living aquatic worms.
  They obtain their food from cruising around and
  feeding off of tiny living animals or scavenging
  off of recently dead animals.
• Others are PARASITIC, they feed off of the blood,
  tissue fluids or tissue cells of their living
  host.

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THREE CLASSES OF FLATWORMS

• TURBELLARIA Free Living Flatworms. Most
  common example Planaria
• TREMATODA Parasitic Flatworms known as flukes,
  most are less than one centimeter.
• CESTODA Long Parasitic worms with hooks to
  attach to intestinal wall of host.

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TURBELLARIA - Planarians
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TREMATODA - Flukes
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Section of Moose Liver Infected with Liver Flukes
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LIFE CYCLE OF BLOOD FLUKE
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CESTODA - Tapeworms
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TAPEWORM REMOVAL
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DEWORMING
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• Do You Have Pets?
• Do You Have Worms?

- Ever think you have rice in your stool/feces
but you havent had rice for a long, long time?
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