Trematoda

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Trematoda
Botulus microporus, a giant digenean parasite from the intestine of a lancetfish
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Platyhelminthes
Superclass:	Neodermata
Class:	Trematoda Rudolphi, 1808
Subclasses
Aspidogastrea Digenea

Trematoda is a class of flatworms known as flukes or trematodes. They are obligate internal parasites with a complex life cycle requiring at least two hosts. The intermediate host, in which asexual reproduction occurs, is usually a snail. The definitive host, where the flukes sexually reproduce, is a vertebrate. Infection by trematodes can cause disease in all five traditional vertebrate classes: mammals, birds, amphibians, reptiles, and fish.