From ZooTerms (Dictionary of Invertebrate Zoology)
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Nemata also nematodes (noun, plural; Greek nema, thread): A phylum containing a large, diverse group of free-living, plant and animal parasitic roundworms, covered by cuticle and having well developed nervous, reproductive and digestive systems, but lack true segmentation, a true coelom and jointed appendages; formerly called Nematoda and Nematoidea.