Knowra Chironex fleckeri Chironex fleckeri Chironex fleckeri is a large box jellyfish native to northern Australia and nearby Indo-Pacific waters. Its tentacles carry venom capable of causing severe pain, cardiac arrest, and death.
Cnidocyte : A specialized cell used by cnidarians to capture prey or deter threats, often by firing a venomous capsule. These cells arm the jellyfish’s tentacles with the microscopic stinging capsules that deliver venom.
Box jellyfish sting : An injury caused when a box jellyfish’s tentacles discharge stinging cells into human skin. Chironex fleckeri is among the species responsible for the most dangerous box jellyfish stings.
Irukandji syndrome : A delayed, severe illness caused by venom from certain small box jellyfish and related species. Unlike typical severe Chironex envenomation, Irukandji syndrome is associated with different jellyfish and symptom patterns.
Cubozoa : The class of cnidarians known as box jellyfish, characterized by cube-shaped bells and complex sensory structures. Chironex fleckeri is a member of this class, whose species vary greatly in size and danger.
Carukia barnesi : A small box jellyfish native to Australian waters and a cause of Irukandji syndrome. It is a medically dangerous cubozoan, but its tiny size and syndrome differ sharply from Chironex.
Nematocyst : A pressurized capsule inside a cnidocyte that rapidly ejects a coiled, often barbed tubule. Its explosive discharge punctures skin and injects venom when tentacles make contact.
Jellyfish sting first aid : Immediate measures used after a jellyfish sting to limit further injury and obtain appropriate medical care. Rapid, species-aware first aid matters because severe Chironex stings can progress quickly.
Cairns : A coastal city in tropical North Queensland, Australia, near the Great Barrier Reef. Its beaches and seasonal marine-stinger warnings place human encounters in a prominent Chironex region.
Chironex : A genus of box jellyfish that includes Chironex fleckeri and related species. The genus places the species among closely related large cubozoans.
Malo kingi : A small box jellyfish associated with Irukandji syndrome in northern Australian waters. Its small body and delayed systemic effects contrast with the large tentacled Chironex.
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