Jellyfish transition between two different body forms throughout their lives. The familiar body plan that looks like an upside down bell with tentacles hanging down from the inside is called the medusa. The polyp, the other cnidarian body plan, is the opposite, with the mouth and tentacles above, like a sea anemone.
Glowing in McMurdo Sound, Antarctica, this transparent jellyfish seems to inhabit another world. From the Arctapodema genus, the transparent jellyfishs grandeur is more remarkable given its inch-long (2.5-centimeter-long) size.