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The moon jelly (Aurelia aurita) is a widely studied species of jellyfish found throughout most of the world's oceans. It is translucent, usually about 25–40 cm (10–16 in) in diameter, and can be recognized by its four horseshoe-shaped gonads, easily seen through the bell. It is capable of only limited motion, and drifts with the current, even when swimming.Photo: Dante Alighieri