Nematocysts are a kind of cnidarian cells, and it's the presence of cnidae that separates jellyfish and different cnidarians from different animals.
These cells are the defining characteristic of phylum Cnidaria.
These are presenton thebodysurface and tentacles of cnidarians for safety and capturing food.
They include nematocysts, which are stinging capsules. It enables catching the prey and in defense.
Nematocytes are produced via way of means of a uniquecellknown as a cnidoblast and consist of a coiled, hole, typically barbed thread, which speedy turns outward from the pill upon right stimulation.
Mainly marine animals coming under cnidaria have cnidoblast cells.