From Halopedia, the Halo wiki

A zap-jelly is a predatory sea creature that populates the brackish seas of Balaho, the Unggoy homeworld. Zap-jellies glow with a faint pink light, which is noted to be similar to that of a Huragok.[1] The translation "zap-jelly" may mean that this creature is similar to the Medusa cnidarians (jellyfish) that are indigenous to Earth.

List of appearances[edit]