Endo parasitic forms
Have a living tegument
No cilia
Mouth is anterior
Have suckers. Some have hooks
Two suckers; oral and ventral
Endoparasites of vertebrates- in lungs, bile duct, pancreatic
duct, intestines, blood
Of medical & economic importance
Usually 2 hosts, one usually is a snail
Large number of eggs produced
Liver flukes- Fasciola, Chlonorchis
Blood fluke- Schistosoma
