Helminths are multicellular worms. The parasitic worms are found in several classes. The trematodes (flukes) and cestodes (tapeworms) contain the flatworms. The nematodes are the roundworms.
A good introduction to helminths can be found here. You can find plenty of pictures of helminths at this website if you click around.
Some important helminth diseases of man include Schistosomiasis, Oncocerciasis, Lymphatic Filariasis, Echinococcosis and Taeniasis. Some roundworm infections found in the USA include Pinworm (Enterobius), Whipworm (Trichuris), Ascariasis, Hookworm and Strongyliasis.
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