4. Kingdom Animalia - part 05 - Phylum : Platyhelminthes
4. Kingdom Animalia - part 05 - Phylum : Platyhelminthes
Phylum : Platyhelminthes (platy -flat, helminth -worms) :
- e.g. Planaria, Taenia (Tapeworm), Fasciola (Liver fluke).
- Body of these animals is dorsoventrally flattened, hence are called as flat worms.
- Animals are acoelomate, triploblastic showing organ-system grade of organization.
- Mostly endoparasitic and few are free-living.
- Parasitic forms shows presence of hooks and suckers for attachment to the body of host.
- Body is covered by cuticle (in parasites) or cilia (in free-living forms).
- Digestive system is generally absent in parasitic forms, but in freeliving forms, it is incomplete (blind-sac plan).
- Animals have flame cells or protonephridia, helpful for excretion and osmoregulation.
- Animals are hermaphrodite (bisexual).
- Self fertilization is seen.
- Few have high power of regeneration and show polyembryony.
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