- 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