They have a flattened or plate-like bell, and multiple delicate hairy tentacles. The bell may be 30cm across in Australian jellyfish, and significantly larger in the cold-water Atlantic jellyfish. Stinging results in severe pain that may last for up to an hour. Nausea and abdominal pain sometimes occur, as do sweating, muscle cramps and breathing difficulties. No deaths have been attributed to this creature.
Many jellyfish inhabit the tropical and temperate waters of Australia.
The majority of stings by these jellyfish result only in local pain and skin welts and erythema. Nausea, vomiting and headaches may sometimes occur. First aid consists of local application of ice packs or iced water, and supportive care such as analgesia as required. Oxford University Press, 1983. Jellyfish Barnes, J H. Studies on three venomous Cubomedusae.