Phylum Platyhelminthes- The Acoelomates
• No coelom
• Triploblastic- 3 germ layers
• Bilateral symmetry
• Organ-system level of organization
• Cephalization
• Excretory system
Class Turbellaria
1. Planarians
2. Lifestyle- Free-living
3. Ciliated epidermis
4. Ex: Dugesia tigrina
Class Trematoda
1. Flukes
2. Lifestyle- Parasitic on vertebrates
3. Protonephridrial System
4. Ex: Clonorchis (Liver fluke of humans) and Schistosoma
Schistosoma
A. Lifestyle- Parasitic
B. Human blood fluke
C. Causes schistosomiasis
Class Cestoda
1. Tapeworms
2. Lifestyle- parasitic on vertebrates
3. No digestive system
4. Body segments-proglottids
5. Ex: Taenia
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Class Turbellaria
Dugesia
Dissecting scope
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Clonorchis
Dissecting scope
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Schistosoma
Female
Male and female
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Taenia
Dissecting scope
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