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Fasciola hepatica is a digenetic trematode. It is an endoparasite in bile passages and liver of sheep and cattle and complete part of its life cycle in snail.

Thus, it primary host is sheep and secondary host is a freshwater snail, Limnaea, Planorbis or Bulinus .

In this video lecture class I describe about External Morphology and Body Wall of fasciola hepatica.

Shape, Size and Colour

Structure

Apertures
Body Wall

Body Wall in Fasciola is characteristic and adapted to parasitic mode of life . Consist following layers:
Tegument
Basement Membrane
Musculature
Mesenchyma or parenchyma