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Carybdea Box Jellyfish
Blue blubber that stung the open water swimmers during the 2007 World Swimming Championships in St Kilda Beach in Melbourne, Australia
noun - Nematocysts are contained in the microscopic barbed stingers of jellyfish. Each nematocyst is made up of a tiny bulb that holds venom and a coiled, sharp-tipped tube. The jellyfish uses the venom to protect itself and kill prey.

When something comes in contact with the tentacle — a fish or a human — tiny triggers on the surface of the tentacle release the nematocysts. The sharp tube penetrates the skin and releases the venom, which affects the immediate area of contact and may enter the bloodstream.

[edit] Jellyfish

Jellyfish are free-swimming marine creatures that float with the winds and currents with a nearly transparent body and long tentacles with stinging cells (nematocysts).

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