The magma jellyfish is a species of jellyfish that only appears in the DS version of SpongeBob's Atlantis SquarePantis. It is a jellyfish that stings the player with its surface and becomes larger as the player touches it. Due to that, it is extremely hard to destroy/defeat.
It is a magma-red jellyfish with many different shades of yellow, red, and orange. Its warm colors that look like fire are supposed to signify that it is dangerous to come in contact with.
It only appears at the Diamond boss at the Volcano of the Mu stage, with 15 in total (In every serve, 4 will come at a time, and at the last serve, 3 appear).