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Irukandji Jellyfish
Scuba divers and snorkelers are perhaps the most cautious about irukandji jellyfish as they are the most venomous of their kind. Populations of this jellyfish exist in the marine waters of the United States and Australia. It is a small creature at only 0.06 cubic inch, making it hard to spot. The Irukandji Jellyfish is responsible for the Irukandji syndrome which manifests as a headache, nausea, muscle, and abdominal pain, hypertension, backache, vomiting, chest pains, and pulmonary edema. The syndrome can lead to death if untreated.
