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The most poisonous sea creatures; From blue ring octopus to stonefish

Irokanji syndrome, named after the Irokanji box jellyfish, is caused by the stings of more than 20 species of box jellyfish.

Of the approximately 50 known species of box jellyfish, the Irokanji is one of the best known and even has a syndrome named after it: Irokanji Syndrome. The name Irokanji comes from the natives of Australia Island in the Cairns region of Australia, where this species is frequently seen.

The Irokanji box jellyfish is very small, about two centimeters in diameter, and has only four arms, but the arms are poisonous. Their umbrella also contains poisonous cells.

Irokanji box jellyfish stings are not painful, but more serious symptoms can occur 20 to 40 minutes after the sting. These symptoms include severe pain, muscle cramps, rapid heartbeat and increased blood pressure, fluid accumulation in the lungs, and fatal heart complications.

Every year in Australia, 50 to 100 people are hospitalized due to Irokanji syndrome. Twenty-five species of box jellyfish can cause Irokanji syndrome, but the Irokanji box jellyfish species is most commonly associated with this syndrome.

Portuguese frigate (Physalia physalis)

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