Identification of dangerous jellyfish species

Ecological, morphological, and clinical features of dangerous jellyfish:

(A) Chironex fleckeri may reach a bell diameter of 20 cm and prefers shallow coastal waters. Tentacle prints show the typical ladder pattern for this animal.
(B) Physalia species – in fact, not a single individual, but a colony of symbiotic polyps – floats on the water surface with the help of a gas-filled bladder and produces whip-like tentacle prints.
(C) Carukia barnesi (Irukandji), a pelagic box jellyfish, is the size of a human thumb. After heavy storms, it may be found in the inward zone of a reef. The nematocysts of the bell produce a faint print on the skin.