a helminth organism of the class Trematoda in the phylum Platyhelminthes, characterized by a body that is usually flat and often leaf-like. Trematodes can infect the blood, liver, intestines and lungs. All of the species that infect domestic animals are in the subclass Digenea, that is they are digenetic flukes. Members of the subclass Monogenea occur on the gills or scales of fish.
common liver fluke1
giant liver fluke1
large liver fluke1
lesser liver fluke1
see paragonimus; includes also Dasymetra, Stomatrema, etc., which infest the mouths of reptiles and can be found in the lungs.