Platyheminthes -Flatworms

Charateristics

• dorsol ventral muscles keep worms flat
• flat body stucture is to distribute food and nutrients to the whole organism- the cells are close by
• aruicle- lobe of head contains 2 brain lobes
• acelomates
• cephalized amimals - has a head
• bilateral symetry
• has sensory organs
  • eyespots- oselli simple eyes

Central Nervous System

• brain
• nerve ladder

Digestion System

• incomplete digestion (ineffiecent)
• one opeing the mouth
• food is carried through the pharynx
• then into the gastrovasular cavity
• then is aborbed by the flatworm

Excratory System

• protenphedria- kidney like function
• flame cells

Reproduction

• Sexual- (hermaphrodites) monecious- has both sexes
• Asexual- transverse budding

Three Classes

• Turbellaria (turbellians)
  • Free living
  • Some are mutialistic- Bdelloura
• Trematoda (flukes)
  • parasitic
• Cestoda (tapeworms)
  • parasitic

Class Turbellaria (turbellaria) can be mutialistic

Slide 35 Planaria digestive tract

SLide 34 Dugesia

Class Trematoda (flukes) parasitic

Schistoma japanica

Schistoma mansoni

Schistoma hemotubim (blood fluke

Slide 36 Fascila hepatica sheep liver fluke

Cysts of flukes in muscle of animals

Clonorchis sinensis (chinese blood fluke)

Slide 37

Slide 36 Fasci

Class Cestoda (Tapeworms) parasitic

Life cycle

Reproduction of Tapeworm

Taenia

Matture Proglottid "Gravid" -full of eggs slide 38

Scolex- part of tape worm that attaches to intestine wall

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