( ( ( ( ( ( ( Nematoda ( -LRB- ( ( ( roundworms or ) nematodes ) -RRB- ) ) ) , ) ( ( a phylum ) ( of ( elongated cylindrical ) ) ) ) , ) smooth-skinned ) , ) ( ( unsegmented ( ( worms , ) ( ( both ( ( aquatic and ) terrestrial ) ) ( , ( ( ( parasitic ( in ( ( animals or ) plants ) ) ) or ) ( free-living ( in ( ( soil or ) water ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NP (NNP Nematoda)) (PRN (-LRB- -LRB-) (NP (NP (NNS roundworms)) (CC or) (NP (NNS nematodes))) (-RRB- -RRB-)) (, ,) (NP (NP (DT a) (NN phylum)) (PP (IN of) (NP (JJ elongated) (NN cylindrical)))) (, ,) (NP (JJ smooth-skinned)) (, ,)) (VP (VBD unsegmented) (NP (NP (NNS worms)) (, ,) (UCP (ADJP (DT both) (JJ aquatic) (CC and) (JJ terrestrial)) (, ,) (ADJP (JJ parasitic) (PP (IN in) (NP (NNS animals) (CC or) (NNS plants)))) (CC or) (VP (VBG free-living) (PP (IN in) (NP (NN soil) (CC or) (NN water))))))) (: ;)))
Nematoda (roundworms or nematodes), a phylum of elongated cylindrical, smooth-skinned, unsegmented worms, both aquatic and terrestrial, parasitic in animals or plants or free-living in soil or water;
(ROOT (S (NP (NNS Nematodes)) (VP (MD can) (VP (VB be) (NP (NP (DT a) (NN parasite)) (PP (IN of) (NP (DT both)))))) (. .)))
Nematodes can be a parasite of both.