Final shape comes with metamorphosis of polyp into a young medusa, from which an adult emerges. Life span of only months. Behavior Do not intentionally sting humans. Sting with tacticle stimulation. In order to fire, stinging cells must be chemically stimulated.
Chemicals come from surface of fish, shellfish and humans.
An individual sea wasp enough venom to kill 60 adult humans. Death occurs rapidly. Sea wasps are strong swimmers. References Hamner, William M. Australia's Box Jellyfish-A Killer Down Under. Hartwick, R.F. 1991.