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vector heart silhouette animal nematode parasitic worm intestinal helminth internal schistosomiasis taenia ascarid ascaris cestoda cestoidea class classification diagram flat flatworm fluke group hookworm human illness infection intestine larva liver outline parasite picture pinworm plathelminthes platyhelminthes platyhelminths roundworm scheme simple solium tapeworm tract trematoda type whipworm icon pictogram sign line