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The elongated, unsegmented nematode body is covered by a thick cuticle. The head is poorly developed; the mouth or pharynx may contain teeth or stylets used to pierce plant or animal tissues. The straight stomach-intestine ends in a short rectum. Nematodes have a unique excretory system consisting, in simpler species, of one or two one-celled glands called renette cells and, in more highly specialized forms, of longitudinal excretory ducts. The reproductive system is complex, and many parasitic species have a very high reproductive potential.
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