Zoology 10th Edition by Stephen Miller,John Harley

Exercise 6

Members of the phylum Nematoda are the roundworms. They are bilaterally symmetrical and pseudocoelomate. They have longitudinal muscles along their body wall, and a complete digestive tract. They feed on a wide variety of foods. Nematodes are dioecious. After copulation, eggs are usually released to the outside of the body where they hatch. Some nematodes are ovoviviparous. Important nematode parasites include Ascaris lumbricoides , Enterobius vermicularis , Necator americanus , Trichinella spiralis , and Wuchereria spp.
Many parasitic nematodes are intestinal parasites whose eggs are released with feces of their host. How does this observation regarding nematode life cycles inform control measures directed at nematode parasites?