phylum platyhelminthes
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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.
• 5. Many parasitic forms
• 6. Most species hermaphroditic
• 7. Acoelomate
• 8. Animals with definite organs
• 9. Cephalization
• II CLASSIFICATION
• Class- Turbellaria =(free living)