What are the peculiar features that you find in parasitic platyhelminthes?

(N/A) Parasitic platyhelminthes,such as $Taenia$ (tapeworm) and $Fasciola$ (liver fluke),exhibit specific adaptations for their parasitic mode of life:
$1$. Body Structure: They possess a dorsiventrally flattened body.
$2$. Attachment Organs: They bear hooks and suckers,which allow them to attach firmly to the tissues inside the host's body.
$3$. Protective Covering: Their body is covered with a thick tegument (cuticle),which protects them from the action of the host's digestive enzymes and acidic environment.
$4$. Nutrient Absorption: The tegument is specialized to absorb nutrients directly from the host's body fluids.