Purple, mauve, red or dark brown body (bell) covered with warts (bearing stinging cells). Four long, frilly oral arms hang from the centre of the bell with 8 tentacles around the edges. Bell up to 10 cm across, tentacles up to 1 m long.
This jellyfish is bioluminescent, emitting green light when moved, for example by waves or by touch. Its name means "night light". A huge bloom of these jellies caused the death of over 100,000 salmon in sea cages in Ireland in 2007.
Oceans, bays and harbours, near surface to depth of 200 m.
Worldwide. Southern Australia.
Mild sting but may cause severe pain if stung by many individuals.
Recorded in Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed