The Keesingia was first photographed back in 1980, and the first live specimen was caught just last year, by its namesake John Keesing. As far as scientists can tell, though, the Keesingia gigas doesn’t have any tentacles — something all jellyfish have in order to catch food. The tentacles of a jellyfish contain a concentration of its stinging cells, which is how it attacks prey and unlucky beach-goers. Strangely, though, scientists working with the jelly have been stung by it despite its apparent lack of tentacles, and have even contracted Irukandji syndrome.
Despite the lack of visible tentacles, scientists feel that the Keesingia does have them. The running theory is that, thanks to random chance, the jellies that were photographed and captured over the years simply lost them for one reason or another. Whatever the actual explanation, Gershwin feels it’ll be “fairly tame.”
The Keesingia are found all over the world, so if you’re afraid of giant, venomous jellyfish that can give you Irukandji syndrome, just try be aware of your surroundings, and don’t swim into a giant pack of jellyfish for fun.