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[[Image:Paramphistomum cervi.jpg|right|150px|thumb|''Paramphistomum cervi'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]

[[Image:Paramphistomum cervi.jpg|right|150px|thumb|''Paramphistomum cervi'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]

The adult fluke is plump and cylindrical (unusual for a [[Trematodes|trematode]]).  It attaches to the wall of the rumen without causing serious damage.  The eggs are like those of ''Fasciola'', but are colourless, and have long filaments present at the poles.

The adult fluke is plump and cylindrical (unusual for a [[Trematodes|trematode]]).  It attaches to the wall of the rumen without causing serious damage.  The eggs are like those of ''Fasciola'', but are colourless, and have long filaments present at the poles.

   

   

The intermediate hosts are water snails, and these shed '''cercariae''' that form '''metacercariae''' on vegetation.

The intermediate hosts are water snails, and these shed '''cercariae''' which later form '''metacercariae''' on vegetation.

Disease occurs if metacercariae are eaten in large numbers.  Enteritis and diarrhoea result when immature flukes migrate along the small intestine (where the metacercariae excyst) towards the rumen.

Disease occurs if metacercariae are eaten in large numbers.  Enteritis and diarrhoea result when immature flukes migrate along the small intestine (where the metacercariae excyst) towards the rumen.