That depends on the species you are referring to. The deadly Irukandji jellyfish is related to the more commonly known box jellyfish, about which visitors to the north Queensland coast are warned. Known for lurking off the coast of Darwin and northern Queensland, the box jellyfish is one of the most potent stingers in Australia. box jellyfish (definitely not a Portuguese Man o' War). Box jellyfish are pretty bad, too. The Indo-Pacific or Australian box jellyfish (Chironex Fleckeri) is claimed to be the most venomous marine animal known to mankind and its sting is often fatal.This extremely poisonous marine stinger frequents Australia's northern oceans all year round. It is tough to spot jellyfish. As Mike has said, taking into account the gun fatalities in the US, Australia is a much safer place all round. Unlike the box jellyfish, the Irukandji jellyfish’s presence is not confined to coastal waters so don’t believe you are safe when far from shore if you are within the northern Australian arc and it is the jellyfish season. The C. fleckeri has a large transparent bell which is nearly the size of a human head. For this reason, it’s important to remain aware when you’re in the water. Irukandji are rarely found outside Queensland, the Northern Territory and Western Australia. Mostly found in the coastal waters of Northern Australia and New Guinea, this species has venomous tentacles up to 3 meters (9.8 ft) long. From man-eating sharks to killer crocodiles along with the planets most venomous snakes. Its highly venomous sting causes a human death in as little time as 3 to 5 minutes. From poisonous snakes to man-eating crocodiles, Australia has a serious reputation for dangerous wildlife.But most of the world’s most dangerous animals don’t live in Australia – such as Malaria-carrying Mosquitos, Cape Buffalo, Hippopotami or the Black Mamba – and you’re much more likely to die crossing the road than you are to be attacked by an animal in Australia. The most venomous of the box jellyfish is the Australian breed, which goes by the formal name of Chironex fleckeri. Being translucent, they can often blend right into the ocean currents. The variety of box jellyfish known as the sea wasp or marine stinger is widely regarded as one of the most deadly creatures on earth. With bell and tentacles just 2.5 centimeters across, it is almost impossible to detect. By the time more serious symptoms appear, it may be too late to save a life. SPUMS J . There have been more than 80 Box Jellyfish deaths in Australia since 1883 so they do pose a serious risk. This denomination is more popular, and it is granted thanks to its dangerous sting. Michelmas Cay. [5] There were 62 people reported being stung by Irukandji in Cairns in 1996; of these more than half occurred in December, 92% were stung on hotter than average days, with 63% occurring while swimming inside a stinger net enclosure on the beach. While box jellyfish are found in warm coastal waters around the world, the lethal varieties are found primarily in the Indo-Pacific region and northern Australia. The Australian Marine Stinger Advisory Services advises you to: The Best Time to Visit the Great Barrier Reef, December in Australia: Weather, What to Pack, and What to See, The Complete Guide to Australia's Magnetic Island, Planning Your Trip to Cairns & the Great Barrier Reef, The Complete Guide to Waimanalo Beach on Oahu, New Zealand’s Dangerous Plants, Animals, and Insects, February in Australia: Weather, What to Pack, and What to See. These interesting and widely feared marine creatures are the free-swimming relatives of corals, anemones, and hydroids—and in the same way that many of these are safe to come into physical contact with, so are several types of jellyfish. Possibly one of the most dangerous marine animals of Australia’s waters, the box jellyfish (Chironex fleckeri) derives its name from the box or bell shape of its body. This is where their venom resides. Although the vast majority of jellyfish stingsare somewhat benign, there are some venomous species that regularly account for both deaths and severe morbidity inhumans. Irukandji jellyfish . (Image credit: DonyaHHI/Shutterstock) One of the most venomous marine creatures known, the box jellyfish can kill a healthy adult in minutes. Numerous venomous species of jellyfish occur in Australian waters, including the box jellyfish and Irukandji Jellyfish. Box jellyfish are believed to have caused at least 69 deaths since record keeping began in 1883. 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