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==Introduction==
==Introduction==
The crustacea are a latge group of arthropods but are ususally treated as a subphylum. The majority of crustaceans are aquatic but some have adapted to terrestrial life.
There are only two species of parasitic crustacea of veterinary importance, the tongue worm ''Linguatula serrata'' and sealice ''Lepeophtheirus and Caligus'' spp.
==''Linguatula serrata''==
==''Linguatula serrata''==