Digenea is a class of trematodes in the Platyhelminthes phylum, consisting of parasitic flatworms with a syncytial tegument and, usually, two suckers, one ventral and one oral. Adults commonly live within the digestive tract, but occur throughout the organ systems of all classes of vertebrates. Once thought to be related to the Monogenea, it is now recognised that they are closest to the Aspidogastrea and that the Monogenea are more closely allied with the Cestoda. Around 6,000 species have been described to date.
Plagiorchiida is a large order of trematodes, synonymous to Echinostomida. They belong to the Digenea, a large subclass of flukes. This order contains relatively few significant parasites of humans.
Echinostomata is a suborder of the parasitic flatworm order Plagiorchiida. The suborder contains numerous species that are parasitic in humans.
Psilostomatidae is a family of trematodes in the order Plagiorchiida. They parasitise aquatic vertebrates as definitive hosts.
Opisthorchiidae is a family of digenean trematodes. Opisthorchiidae have cosmopolitan distribution.
Heterophyidae is a family of intestinal trematodes in the order Plagiorchiida.
Telorchiidae is a family of trematode parasites.
Metorchis is a genus of flatworms belonging to the family Opisthorchiidae.
Echinostomatidae is a family of trematodes in the order Plagiorchiida, first described in 1899.
Gymnophallidae is a family of trematodes in the order Plagiorchiida.
Lepocreadiidae is a family of trematodes in the order Plagiorchiida.
Xiphidiata is a suborder of Plagiorchiida, an order of parasitic flatworms (flukes).
Azygia is a genus of flatworms belonging to the family Azygiidae.
Cathaemasiidae is a family of flatworms belonging to the order Plagiorchiida.
Accacoeliidae is a family of trematodes belonging to the order Plagiorchiida.
Brachycladiidae is a family of trematodes belonging to the order Plagiorchiida.
Cryptogonimidae is a family of trematodes belonging to the order Plagiorchiida.
Hemiuridae is a family of trematodes belonging to the order Plagiorchiida containing 514 described species.
Pleurogenidae is a family of trematodes belonging to the order Plagiorchiida.
Syncoeliidae is a family of trematodes belonging to the order Plagiorchiida.
