What are trematodes?

Trematodes or are flatworms of the class Trematoda of the phylum Platyhelminthes. They have complex life cycles that usually involve a snail as an intermediate host. The definitive host of the adult worms, generally a mammal, acquires the parasite by ingesting an encysted form in a second intermediate host or on vegetation. Many species can infect humans, but most normally parasitize other mammals, and humans are accidental hosts.Note: Trematodes also go by the name of flukes.