Carukia barnesi

Carukia barnesi is an extremely venomous box jellyfish found in waters near Australia. Its sting can cause Irukandji syndrome, and the species is commonly known as the Irukandji jellyfish, though that name does not distinguish it from other Irukandji jellyfish such as Malo kingi. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/