Box jellyfish

Many people don’t know that the worlds most venomous marine animal thrives in habitats occupied by humans, is incredibly hard to spot, and has enough venom to kill multiple adults. Nearly 100 people die each year from injuries caused by the box jellyfish.

Coming in at an average weight of 4.4 lbs (2 kg), just a single box Jellyfish has the ability to kill 60 adults.

Box jellyfish anatomy

There are notable physical differences between box jellyfish and other jellyfish species. Rather than the usual dome shape we see with most species, the sea wasp is shaped more like a boxy umbrella. Their design helps them move much more effectively than any other jellyfish species.

From each of their 4 lower corners hangs a short stalk, which bears one or more hollow tentacles. Similar to other jellyfish, the tentacles are what you need to worry about.

Some sub-species of box jellyfish have tentacles that are 10 feet long, while others, like the sub-species irukandji, are small enough to fit on a quarter. The Irukandji are the smallest, most venomous box jellyfish in the world.


Additionally, the box jellyfish has a nervous system that is much more sophisticated than other jellyfish. This species has a nerve base that allows it to coordinate movements, and can reach speeds of up to 4.6mph (4 knots, 7.4 km/h).
Box Jellyfish are one of the few species of jellyfish that have eyes, 24 of them to be exact. They are able to distinguish between light and dark, and make it possible for them to find their prey.


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