Harmless
Cotylorhiza tuberculata
Scyphozoa (Cepheidae)
It lives in symbiosis with micro-algae (zooxanthellae) hosted in its tissues. These algae give it its beautiful colors and help it feed through sunlight.
Sting symptoms
Completely harmless. Does not sting.
Identification
It literally looks like a fried egg: the center is domed, smooth, and yellow-orange, surrounded by a lighter flat disk. Underneath, its short oral arms end in bright purple or blue buttons.
Size
Umbrella: 30 to 40 cm
Habitat
Endemic to the Mediterranean. Often swims just below the surface.
Scientific family
Scyphozoa (Cepheidae)