A box jellyfish with smooth exumbrella that has a maximum bell height of 150 mm.

The species was distinguished from the other Chironex by the bulbous shaped pedalial canal.

[1] Most of the Chironex box jellyfish in Thailand were found only from 9o from the equator and northward.

[2] The genus Chironex is renowned for delivering highly venomous envenomations that cause fatalities in many countries such as Japan, Philippines and Australia.

All of the fatal cases in the Gulf of Thailand occurred in the area where the Chironex box jellyfish are found.