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

Explanation

Most of the platyhelminths are endoparaste and their parasitic life enforces them to aquire parasitic adaptation as given follow:
(i)Protective external body covering.
( ii) Higher internal osmotic pressure.
(iii) Higher pH tolerance, that is, from 4 to 11
(iv) Scotex, with suckers and spines for attachment with epithelial lining of the host.s intestine. So the parasite may not be ejected from intestine.
( v) Adult as well as larva lack cilia and other organs of locomotion, which are not needed.
(vi) Due to absorptive mode of feeding alimentary canal is totally absent. (vii) Anaerobic respiration
(viii) Circulatory, respiratory and sensory organs are absent.
(ix) Reproductive system is immensly developed and production of large number of eggs.
(x) Resistant covering, shell or capsule around zygotes and embryos provide protection from unfavourable condition.