Irukandji Jellyfish (Carukia barnesi): Tiny but terrifying, this jellyfish is no bigger than a fingernail yet delivers a sting with disproportionate consequences. Native to northern Australian waters, it causes Irukandji syndrome—delayed symptoms including severe pain, hypertension, vomiting, and a feeling of impending doom. In extreme cases, it can lead to brain hemorrhage or heart failure. The small size and nearly transparent body make it hard to detect. Treatment involves pain management and monitoring, as antivenom is not yet available. Its increasing sightings in warmer oceans raise concerns about climate change expanding its habitat and threat to swimmers.
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