Nematode

Also called  Roundworm,   any worm of the class Nematoda (phylum Aschelminthes, though many authorities consider the Nematoda to be a distinct phylum). Nematodes are among the most abundant animals, occurring as parasites in animals and plants or as free-living forms in soil, freshwater, marine environments, and even such unusual places as vinegar and beer malts. The number of named species