Write the general features of flatworms.

(N/A) $\rightarrow$ $Platyhelminthes$ have a dorso-ventrally flattened body,hence they are called flatworms.
$\rightarrow$ These are mostly endoparasites found in animals,including human beings.
$\rightarrow$ Flatworms are bilaterally symmetrical,triploblastic,and acoelomate animals with an organ-level of organization.
$\rightarrow$ Hooks and suckers are present in the parasitic forms.
$\rightarrow$ Some of them absorb nutrients from the host directly through their body surface.
$\rightarrow$ Specialized cells called flame cells help in osmoregulation and excretion.
$\rightarrow$ Sexes are not separate (hermaphrodite).
$\rightarrow$ Fertilization is internal,and development is indirect through many larval stages.
$\rightarrow$ Some members like $Planaria$ possess high regeneration capacity.
$\rightarrow$ Examples: $Taenia$ (Tapeworm),$Fasciola$ (Liver fluke).