Deadliest Fishes in the World 1. • The Irukandji jellyfish (Carukua barnesi) is a smaller relative of the sea wasp measuring only 0.6 in. The Most Dangerous Jellyfish In The World. (2.5 cm) across with four 20-inch (50 cm) tentacles. The sting from this jellyfish is known as the Irukandji syndrome which can increase the blood pressure and heart rate. there indeed are some of these jellyfish that are harmless to humans and pose no danger to humans. This beautiful transparent creature is oldest animal species on earth. Most dangerous jellyfish in the planet After you see this video you will know the diferent jellyfish that are dangerous. Music: Split Screen (1.5 cm) to 1 in. Box Jellyfish. Stings from species such as the box jellyfish can be deadly. Irukandji jellyfish is probably the tiniest jellyfish ever discovered in the world. Irukandji jellyfish (/ ˌ ɪr ə ˈ k æ n dʒ i / IRR-ə-KAN-jee) are any of several similar, extremely venomous species of box jellyfish.With an adult size of about a cubic centimeter (1 cm 3), they are both the smallest and one of the most venomous jellyfish in the world. Although the box jellyfish has been called "the world's most venomous creature", only a few species in the class have been confirmed to be involved in human deaths, and some species pose no serious threat at all. Jellyfish venom is one of the deadliest toxins on Earth. The Irukandji jellyfish can be found off the coasts of Australia, and it is considered one of the deadliest creatures on the entire continent. Learn how humans and other animals trigger jellyfish venom and what the cure is. Fortunately for humans, that sting is rarely fatal. To catch prey, the jellyfish wraps its tentacles around the animal which triggers the stinging cells into action. Box jellyfish national geographic antidote to box jellyfish venom deadliest creatures that roam the earth antidote for deadly box jellyfish sting deadliest creature sea wasp marine How Deadly Is The Box Jellyfish Live Science5 Most Venomous Jellyfish In The World5 Most Dangerous Jellyfish In The World Pla DeadlyBox Jellyfish National GeographicWhat Is The Most Venomous… Read More » However, it is very important to know that several species have highly poisonous stinging cells. It has a cuboid-shaped body and 10 feet long tentacles that have over 5000 stinging cells. Irukandji has killed at least 70 people in the past 50 years. Despite from its tiny appeareance, the sting from its nematocyst are extremely strong and it will give you the worst nightmare in the real life. These jellyfish, called Pacific Sea Nettles, possess an extremely painful sting. The box jellyfish is also known as the sea wasp and the Australian box jellyfish (Source: DAN). 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