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Phylum Platyhelminthes

Phylum Platyhelminthes. 1. 20,000 species -most parasitic; only 20 species are free-living. I Characteristics 1. Bilateral symmetry 2. Triploblastic 3. Flattened dorsoventrally * 4. Excretory system of flame cells{protonephridia}. Phylum Platyhelminthes contd.

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Phylum Platyhelminthes

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  1. Phylum Platyhelminthes • 1. 20,000 species -most parasitic; only 20 species are free-living. • I Characteristics • 1. Bilateral symmetry • 2. Triploblastic • 3. Flattened dorsoventrally * • 4. Excretory system of flame cells{protonephridia}

  2. Phylum Platyhelminthes contd. • 5. Many parasitic forms • 6. Most species hermaphroditic • 7. Acoelomate • 8. Animals with definite organs • 9. Cephalization • II CLASSIFICATION • Class- Turbellaria =(free living)

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