Etymologically it means that it looks like a thread or a strand. They are also called nematelmintos. Taxonomically they are a phylum of pseudosecellomated vermes. It is the designation that in zoology and biology is given to a group of invertebrate animals to which cylindrical worms belong and some are parasites. Popilarmente they are called roundworms or cylindrical. Living beings belonging to the phylum Nematoda or Nemathelminthes.
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