Barry Bland / Fried egg jelly fish (Cotylorhiza tuberculata) Mediterranean Sea.

Chris Newbert / Jellyfish (Cotylorhiza sp) and young Jack (Carangidae) , which are immune to the Jellyfish's sting and often hide among the tentacles for protection, Truk Lagoon, Micronesia

Jeff Rotman / Fried egg jellyfish {Cotylorhiza tuberculata} in open ocean, Italy, Mediterranean

Jeff Rotman / Fried egg jellyfish {Cotylorhiza tuberculata} in open ocean, Italy, Mediterranean

Jeff Rotman / Stinging nematocysts on Fried egg jellyfish, Italy {Cotylorhiza tuberculata}

Francis Abbott / Cotylorhiza tuberculata - rare, large jellyfish thought not to sting; note large number of aural lobes. Mediterranean Sea

Francis Abbott / Cotylorhiza tuberculata - rare, large jellyfish thought not to sting; note large numbers of aural lobes. Mediterranean Sea

Francis Abbott / Jellyfish (Cotylorhiza tuberculata) Mediterranean. A rare and large jellyfish that is thought not to sting.

Joel Sartore / Photo Ark / Mediterranean jellyfish (Cotylorhiza tuberculata) underside portrait, Loro Parque's Aquarium, Tenerife. Captive.

Joel Sartore / Photo Ark / Mediterranean jellyfish (Cotylorhiza tuberculata) underside, portrait, Loro Parque's Aquarium, Tenerife. Captive.

Joel Sartore / Photo Ark / Three Mediterranean jellyfish (Cotylorhiza tuberculata) portrait, Loro Parque's Aquarium, Tenerife. Captive.

Franco Banfi / Mediterranean jelly or fried egg jellyfish (Cotylorhiza tubercolata) Massa Lubrense, Punta Campanella Marine Protected Area, Costa Amalfitana, Italy, Tyrrhenian Sea, Mediterranean.