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Trematodes are flattened oval or worm-like animals, usually no more than a few centimetres in length, although species as small as 1 millimetre (0.039 in) (Monogenea) and as large as 7 centimetres (2.8 in) (Fasciolopsis) are known. species that exemplifies the remarkable life history of the trematodes is the bird fluke, Leucochloridium paradoxum. The definitive hosts, in which the parasite reproduces, are various woodland birds, while the hosts in which the parasite multiplies (intermediate host) are various species of snail.
The Trematoda is also known as a fluke and is an endoparasite meaning that they live in their host's body. Their digestive system is similar to the Turbellarian digestive system but they don't have the Turbellarian's extensible pharynx.t works but sucking food into the intestine where phagocytic cells of the gastrodermis complete digestion. The Cestoda, one of the three classes of the Platyhelmthes, does not have a digestive system and the rest of the parasitic classes rely on the host for digestion.