Class 11 Biology Animal Kingdom Phylum Platyhelminthes


  • Platyhelminthes have dorso-ventrally flattened body, hence are called flatworms.
  • They are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organization.
  • Hooks and suckers are present in the parasitic forms and some of them absorb nutrients from the host directly through their body surface.
  • Specialized cells called flame cells help in osmoregulation and excretion.
  • Sexes are not separate, fertilization is internal and development is through many larval stages.
  • Some members possess high regeneration capacity. Example- Planaria

Examples: Taenia (Tapeworm), Fasciola (Liver fluke).


Fig. Liver fluke

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