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Cnidarians posses special stinging cells called cnidocytes or nematoblasts. Each cnidocyte acts as a capsule and encloses a namatocyst. The namatocyst is filled with a poisonous fluid, hypotoxin, and its anterior end is drawn out into a long hollow thread which may bear spines.

On being stimulated, the nematocyst is ejected and its long thread either injects poisons into the body of prey, killing or paralysing it or coils around it. Thus these help in food capture, offence and defence and in adhesion.

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