A phylum of worms, having a long, round, and generally smooth body; the roundworms. They are mostly parasites, in plants and animals, but some are free-living in soil or water. Also called Nematoidea.
Phylum of roundworms which live in moist habitats, including aquatic environments, wet soil, and animal tissue. Nematodes may survive as decomposers, parasites, and agricultural pests. They are characterized under the microscope by their snake-like bodies and thrashing movements.
unsegmented worms: roundworms; threadworms; eelworms
The phylum of aschelminths that contains members commonly called either roundworms or nematodes. Tripoblastic, bilateral, vermiform, unsegmented, and pseudocoelomate.