Top Ten Most Dangerous Jellyfish

The items in this list have been selected by the author of the list for you to vote and comment on.
The Top Ten
1 Box Jellyfish Box jellyfish are cnidarian invertebrates distinguished by their cube-shaped medusae. Some species of box jellyfish produce extremely potent venom: Chironex fleckeri, Carukia barnesi and Malo kingi.

They can even kill people.

2 Irukandji Jellyfish
3 Portugese man of war Jellyfish

Here in Australia they're called 'Blue Bottles'.

4 Cannonball Jellyfish
5 Moon Jellyfish
6 Lion's Mane Jellyfish
7 Sea Nettle Jellyfish
8 Blue Striped Jellyfish
9 Blue Jellyfish
10 Dipulmaria Antarctica Jellyfish