jimble; Carybdea rastoni
A small, venomous box jellyfish found in Australian and Indo-Pacific waters. The Japanese name アンドンクラゲ literally means 'lantern jellyfish', referring to its shape.
オーストラリアの海でアンドンクラゲに刺された。
I was stung by a jimble in the sea off Australia.
Even though the jimble is small, its venom is potent.