Platyhelminthes

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Platyhelminthes
lthttp//clean-water.uwex.edu/pubs/clipart/critters
.plan.htmgt
Quick Quiz How long are the longest flatworms?
Eugene Lee, Hyun Seok Lee
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What Are Platyhelminthes?

• Named because their bodies are thin between the
  dorsal and ventral surfaces
• Platyhelminth

Eugene Lee
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Sample Animal Blood Fluke

• Blood Fluke (Schistosoma Mansoni)
• Trematoda
• Schistosomiasis, a disease whose symptoms include
  pain, anemia, and dysentery.

lthttp//georgiafaces.caes.uga.edu/graphicsfiles/La
ndPlanarian33hr.jpggt
Eugene Lee
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Sample Animal Pseudoceros dimidiatus

• Turbellaria
• Yello/Black Stripes with Orange Edge
• Found in Indo-Pacific, Red Sea

lthttp//www.waterworxbali.com/Images/Photos/Large/
pseudoceros-dimidiatus.jpggt
Eugene Lee
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4 Classes of Platyhelminthes

• Turbellaria
• Monogenea
• Trematoda
• Cestoda

Schistosoma(Blood flukes)
lthttp//img2.scoop.co.nz/stories/images/0304/eec67
49f6646c81b6298.jpeggt
Hyun Seok Lee
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Body Symmetry/Cavity
None. No Skeletal System!
Callioplana marginata
Eugene Lee
lthttp//www.daveharasti.com/nelsonbay/seaslugs/fla
tworms/callioplana_marginata.jpggt
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Locomotion/Musculature

• Uses Cilia on their ventral epidermis
• Some other turbelarians use their muscles

Hyun Seok Lee
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Nervous System

• Eyespots (Sensory Structure)
• Ventral Nerve Cords
• Ganglia

lthttp//kdhellner.tripod.com/id17.htmlgt
Eugene Lee
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Excretory/Digestive System

• Simple excretory apparatus
• A combination digestive/excretory system

Mouth
Hyun Seok Lee
lthttp//kdhellner.tripod.com/id17.htmlgt
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Circulatory System

• Gastrovascular cavity
• Eats small worms, insects, and microscopic matter

Eugene Lee
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Reproduction

• Hermaphroditic

lthttp//highered.mcgraw-hill.com/sites/dl/free/007
8664276/281029/ccq_ch12_q4a.gifgt
Hyun Seok Lee
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Gas Exchange

• Diffusion

lthttp//1.bp.blogspot.com/_8S5FnilQeWM/R02wga5Iy0I
/AAAAAAAAAA8/CGecy2kqb9Q/s320/48842.jpggt
Hyun Seok Lee
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Quiz

• What processes are occurring during gas exchange
  and excretory system?

• How do flatworms reproduce? Through what process?

• How do flatworms carry out excretory and
  digestive system?

• Name 4 classes of Platyhelminthes

Hyun Seok Lee, Eugene Lee
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Answers

• Diffusion
• Asexually
• Through pharynx/Vastrovascular cavity
• Turbellaria, Monogenea, Tremattoda, Cestoda

Hyun Seok Lee, Eugene Lee