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Phylum PlatyhelminthesPhylum Platyhelminthes“Flat Worms”“Flat Worms”
By By Mr. “Super Bowl Bound” Mr. “Super Bowl Bound”
ChapmanChapman
PlatyhelminthesPlatyhelminthes
Platy = flatPlaty = flat
Helminthes = wormHelminthes = worm
Flat WormsFlat Worms
CharacteristicCharacteristicss 1. Triploblastic1. Triploblastic Three layers of cellsThree layers of cells
PlatyhelminthesPlatyhelminthesFlatworms 3 cell layers:Flatworms 3 cell layers:Ectoderm (epidermis)Ectoderm (epidermis)MesodermMesodermEndodermEndoderm
CharacteristicsCharacteristics 2. Linear nervous system with a ganglion 2. Linear nervous system with a ganglion
(brain)(brain)
CharacteristicsCharacteristics 3. Dorsoventrally flat, bilaterally symmetrical 3. Dorsoventrally flat, bilaterally symmetrical
bodybody
CharacteristicsCharacteristics 4. 4. CephalizationCephalization – the development of an – the development of an
anterior end (head)anterior end (head)
CharacteristicsCharacteristics 5. Incomplete digestive system (one 5. Incomplete digestive system (one
opening)opening) 6. An excretory system for removing cellular 6. An excretory system for removing cellular
wasteswastes
There are four classes of flatworms, three of which are important to us…
PlatyhelminthesPlatyhelminthes Class: Turbellaria – planaria and ribbon
worms.
Class: Cestoda – tapeworms
Class: Trematoda – flukes
The End