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Most of the large, often colorful, and conspicuous jellyfish found in coastal waters throughout the world are Scyphozoa. [4] They typically range from 2 to 40 cm (1 to 15 + 1 ⁄ 2 in) in diameter, but the largest species, Cyanea capillata can reach 2 metres (6 ft 7 in) across.
When the venom of the box jellyfish was sequenced, it was found that more than 170 toxin proteins were identified. [38] The high quantity of toxin proteins that the box jellyfish possess is the reason they are known to be so dangerous. Stings from the box jellyfish can lead to skin irritation, cardiotoxicity, and can even be fatal. [38]
Chirodectes is a very rare, monospecific genus of box jellyfish in the family Chirodropidae.. The first and only scientifically studied specimen was captured from the outer edge of the Great Barrier Reef – about 43 km (27 mi) off the coast of northeast Queensland – on 2 May 1997. [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. On average, however, the animals are much smaller, being more typically 60 millimetres (2.4 in) in height. The maximum inter-radial diameter is 95 millimetres (3.7 in).
Chironex fleckeri is the largest of the cubozoans (collectively called box jellyfish), many of which may carry similarly toxic venom. Its bell usually reaches about 16 cm (6.3 in) in diameter but can grow up to 35 cm (14 in). [ 8 ]
Chiropsalmus quadrumanus is a cube-shaped, colourless, transparent jellyfish with a diameter of about 14 centimetres (5.5 in) and height a little less than this. The body is composed of a gelatinous material and the top edges are rounded while the top surface is flat.
Warning signs have been posted in Waikiki and Pokai Bay Beach Park following an observance of box jellyfish. Beachgoers are advised to check with a lifeguard about the latest ocean and beach ...
The Irukandji jellyfish (/ ɪr ə ˈ k æ n dʒ i / irr-ə-KAN-jee) are any of several similar, extremely venomous species of rare box jellyfish. With a very small adult size of about a cubic centimetre (1 cm 3 or 0.061 in 3 ), they are both one of the smallest and one of the most venomous jellyfish in the world.