Which specific species mentioned requires aggressive medical consultation for any sting, regardless of initial size?

Answer

Chironex fleckeri (Box Jellyfish)

The venom potency of certain marine species dictates the urgency of medical response. The Chironex fleckeri, commonly known as the Box Jellyfish, carries venom that is potent enough to induce rapid collapse or even cardiac arrest, even from seemingly minor exposures. Because of the known speed and toxicity of its venom, any sting from this specific species, irrespective of the apparent size of the sting site, warrants bypassing initial urgent care and seeking immediate, aggressive medical consultation to manage the potentially life-threatening progression of the envenomation.

Which specific species mentioned requires aggressive medical consultation for any sting, regardless of initial size?
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