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Platyhelminthes notes
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Phylum PlatyhelminthesPhylum Platyhelminthes
Flatworms
CharacteristicsCharacteristicsBilaterally symmetrical - Mirrored right and left
sidesTripoblastic - Bodies have 3 cell layers
– Epiderm / Ectoderm (outside)– Mesoderm (middle)– Endoderm (inside)
Organs – Reproductive, Musculature, ExcretoryCephalization – concentration of nervous tissue at
anterior.Pharynx – Combined mouth and anus
ClassificationClassification1. Class Turbellaria – “Free-living” flatworms
Ex. Planaria Most, some fresh water, some terrestrial.
Marine planaria
Freshwater planariaParasitic Terrestrial
planaria
2. Class Trematoda - Parasitic flukes
Ex. Liver Flukes, Blood Flukes
Sheep Liver Fluke
Human Blood Fluke
3. Class Cestoda -
Ex. Parasitic Tapeworms
Tapeworm AnatomyTapeworm Anatomy
Scolex - Head Proglottid - Segment
Tapeworm Anatomy (Cont’d)Tapeworm Anatomy (Cont’d)
Tapeworm Lifecycle