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1. Phylum PlatyhelminthesPhylum Platyhelminthes
“Flat Worms”“Flat Worms”
ByBy
Mr. “Super Bowl Bound”Mr. “Super Bowl Bound”
ChapmanChapman

2. PlatyhelminthesPlatyhelminthes
Platy = flatPlaty = flat
Helminthes = wormHelminthes = worm
Flat WormsFlat Worms

4. CharacteristicsCharacteristics
 1. Triploblastic1. Triploblastic
 Three layers of cellsThree layers of cells

5. PlatyhelminthesPlatyhelminthes
Flatworms 3 cell layers:Flatworms 3 cell layers:
Ectoderm (epidermis)Ectoderm (epidermis)
MesodermMesoderm
EndodermEndoderm

6. CharacteristicsCharacteristics
 2. Linear nervous system with a ganglion (brain)2. Linear nervous system with a ganglion (brain)

7. CharacteristicsCharacteristics
 3. Dorsoventrally flat, bilaterally symmetrical body3. Dorsoventrally flat, bilaterally symmetrical body

8. CharacteristicsCharacteristics
 4.4. CephalizationCephalization – the development of an– the development of an
anterior end (head)anterior end (head)

9. CharacteristicsCharacteristics
 5. Incomplete digestive system (one opening)5. Incomplete digestive system (one opening)
 6. An excretory system for removing cellular6. An excretory system for removing cellular
wasteswastes

10. There are four classes of flatworms, three of which
are important to us…

11. PlatyhelminthesPlatyhelminthes
 Class: Turbellaria – planaria and ribbon worms.
 Class: Cestoda – tapeworms
 Class: Trematoda – flukes

12. The End