Nematocyst | KidzSearch. Family-friendly safe search for kids.

The cnida is the basic term for the stinging apparatus of the phylum Cnidaria. The whole life-style of the phylum is based on this device, which enables the animals to catch their prey. The cnida appears in several forms: the most usual is the nematocyst.

Diagram of nematocyst discharging

Cnidae are organelle-like capsules with eversible tubules (they shoot the tubule outwards). They are the diagnostic feature of the phylum. All cnidarians possess cnidae; no loss of the feature is known.

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