Habit and habitat: Members of thisphylum are mainly ectoparasite or endoparasite of other organisms but a few species are free living. They live in fresh water, drain; stream etc. and some species live in saline water, some member of this phylum live in damp and moist soils
a) They are flat bodied, worm like diocious and mostly endoparasitic animals.
b) Body is covered by a thick cuticle.
c) Sucker or hooks are present.
d) Flame cell is the excretory organ.
e) Digestive system incomplete or absent.
Example: Taenia soliumTape worm Fasciola hepatica liver fluke.