Stalked jellyfish differ from true jellyfish in a few ways, namely by being stationary for their entire adult lives. They do, however, still have the same stinging tentacles for which their mobile cousins are famous. Known as the nematocysts, the harpoon-like cells of the tentacles deliver a sharp sting to any prey which drift close enough, and also stick tight, allowing food to be pulled into their mouth.
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Larvae of the stalked jellyfish will crawl along the seabed looking for a safe place where they will settle and change into an adult.
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Unlike its drifting cousins, the stalked jellyfish is sedentary, remaining stuck to the blades of seagrass or any other safe surface. Found around the coast of the UK, species of stalked jellyfish are found in shallow water with good currents for bringing in tiny, planktonic food.