Trematodes are flukes that are always found in vertebrates. They are parasites. The food moves through the mouth with hooks and suckers and then into the pharynx and esophagus. Then, like other animals in this phylum, the food passes through the esophagus and into the intestine immediately. Nutrients are used by the animal, but the animal still has to get rid of this waste. The fluke, when it does not need the left-over waste and nutrients, disposes of it through its mouth again, because there are no other openings in the Trematode