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unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic
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intestinal parasite of humans and pigs
intestinal parasite of domestic fowl
small threadlike worm infesting human intestines and rectum especially in children
any of various small free-living plant-parasitic roundworms
small roundworm parasitic on wheat
parasitic nematode occurring in the intestines of pigs and rats and human beings and producing larvae that form cysts in skeletal muscles
parasitic bloodsucking roundworms having hooked mouth parts to fasten to the intestinal wall of human and other hosts
slender threadlike roundworms living in the blood and tissues of vertebrates; transmitted as larvae by biting insects
parasitic roundworm of India and Africa that lives in the abdomen or beneath the skin of humans and other vertebrates
minute eelworm that feeds on organisms that cause fermentation in e.g. vinegar
any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae
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