a class of flatworms that comprises those flukes that are internal parasites. The monogenean flukes are sometimes also placed in this class
a parasitic flatworm which typically has suckers and hooks for attachment to the host. Some species are of veterinary or medical importance
a fluke which has a complex life cycle and is of medical and veterinary importance. The adult lives within the liver tissues of a vertebrate, and the larva within one or more secondary hosts such as a snail or fish
a parasitic flatworm which needs two hosts to complete its life cycle. The immature form infests freshwater snails and the adult lives in the blood vessels of birds and mammals, causing bilharzia in humans