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Top: Science: Biology: Flora_and_Fauna: Animalia: Nematoda
Nematodes are the second most diverse animal phylum (after the arthropods), with about 20,000 species. Free-living nematodes are abundant in soils and sediments, where they feed on bacteria and detritus. Some nematodes are plant parasites, including organisms that cause disease in economically important crops. Others parasitize animals (including humans). Well-known parasitic nematodes include hookworms, pinworms, Guinea worm (genus Dracunculus), and intestinal roundworms (genus Ascaris). Most nematodes are long, slender, almost featureless externally, tapered at both ends, and round in cross section.
Order of parasitic nematodes.
Order of nematode worms.
Rhabditida is an order of nematodes. Most members are free-living in soil but some are animal parasites.
Order of mostly parasitic nematodes.
Order of nematodes, many of which are animal parasites. Includes the families Trichuridae and Trichinellidae.
Order of nematodes, including many plant-pathogenic species.
Order of soil nematodes.
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