[2] Discovered in 2009, it is highly venomous and has been the cause of several deaths in Japanese waters.

In the past, this species was considered conspecific with Chiropsalmus quadrigatus found in Malaysia.

That name however, is now considered as a nomen dubium and it is no longer recognized as a separate species.

[2] The medusa is box-shaped and has a maximum height of about 110 millimetres (4.3 in) which is only about one half to one third the size of Chironex fleckeri.

The symptoms include cardiac arrest and respiratory failure with acute pulmonary oedema.