Lion's Mane syndrome
From OpenwaterpediaLion's Mane jellyfish. Stings by the Lion's Mane jellyfish can lead to severe pain within 20 minutes or more, weakness, vertigo, nausea, headache and muscle cramps. In very severe stings, there may be difficulty breathing and pain on respiration, tachycardia, muscle spasms, palpitation or chest tightness, stiffness of back and joints, anaphylactoid reactions, and weeping of the skin.
Lion's Mane Jellyfish
The lion's mane jellyfish (Cyanea capillata) is the largest known species of jellyfish that are named for their showy, trailing tentacles reminiscent of a lion's mane.
The lion's mane's range is confined to cold waters of the Arctic, northern Atlantic, and northern Pacific Oceans, seldom found farther south than 42°N latitude. Similar jellyfish, which may be the same species, are known to inhabit seas near Australia and New Zealand. The largest recorded specimen found, washed up on the shore of Massachusetts Bay in 1870, had a bell (body) with a diameter of 7 feet 6 inches (2.29 m) and tentacles 120 feet (37 m) long.
Lion's Mane syndrome was coined by Professor Tom Doyle of the University College Cork.