Discuss the habitat, habits and external characters of Fasciola.

Explanation

The common name of Fasciola is liverfluke.
Habitat: Fasciola lives in the bile ducts of the liver of sheep and goats. These animals are called primary hosts. Its secondary host is fresh water snail.
Habits : Fasciola keeps attached to the bile ducts by suckers. It is holozoic organism. It feeds on blood, bile and epithelial cells of bile ducts. The worm is hermaphrodite. Its life history involves two hosts, sheep and fresh water snail.
External characters: Fasciola has a soft, flat, dark brown leaf like body. The head lobe bears the mouth. It is surrounded by oral suckers. A minute general aperture and a large cup shaped ventral sucker lies on the ventral surface. The posterior end bears excretory pore.