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.
Phyllonorycter is a genus of moths in the family Gracillariidae.
Heterophyidae is a family of intestinal trematodes in the order Plagiorchiida.
Spirifer is a genus of marine brachiopods belonging to the order Spiriferida and family Spiriferidae. Species belonging to the genus lived from the Middle Ordovician (Sandbian) through to the Late Triassic (Carnian) with a global distribution. They were stationary epifaunal suspension feeders.
Opisthorchiata is a suborder of flatworms in the subclass Digenea.
Telorchiidae is a family of trematode parasites.
Heterophyes is a genus of trematodes, or fluke worms, in the family Heterophyidae.
Philophthalmidae is a family of trematodes in the order Plagiorchiida.
Echinostomatidae is a family of trematodes in the order Plagiorchiida, first described in 1899.
Gorgoderidae is a family of trematodes in the order Plagiorchiida.
Polyangium is a genus of flatworms belonging to the family Microscaphidiidae.
Phyllodistomum is a genus of flatworms belonging to the family Gorgoderidae.
Azygia is a genus of flatworms belonging to the family Azygiidae.
Philophthalmus is a genus of trematodes belonging to the family Philophthalmidae.
Tetrameres is a genus of nematodes belonging to the family Tetrameridae.
Gorgodera is a genus of flatworms belonging to the family Gorgoderidae.
