Cotylorhiza tuberculata is a species of jellyfish of the phylum Cnidaria, also known as the Mediterranean jellyfish, Mediterranean jelly, or fried egg jellyfish. It is commonly found in the Mediterranean Sea. Beautiful and elegant, it lends itself well to underwater photography and video shooting, making itself admired by all those who love the sea.

Big mediterranean Barrel jellyfish, Rhizostoma pulmo, It typically is up to 40 cm. in diameter, but can exceptionally reach 150 cm. or larger, making it the largest jellyfish in British waters, is moderately venomous but not as deadly as other species. Effects include a burning sensation on the skin, dermatitis, and ulcers which confirms it is toxic to humans. However, it does not pose a serious threat to humans.

Pelagia noctiluca is ajellyfish in the family Pelagiidae. It is typically known in English as the mauve stinger, but other common names are purple-striped jelly (causing potential confusion with chrysaora colorata), purple stinger, purple jellyfish, luminous jellyfish and night-light jellyfish. Pelagia noctiluca can be described as a marine organism with the ability to glow in the dark (bioluminescence). It is found worldwide in tropical and warm temperate seas.

This video show a jellyfish, Rhizostoma pulmo, partially eaten by fish. It often happens during our dives to find jellyfish that have been attacked by fish; in fact they represent an important food for many marine animals including cetaceans: such as dolphins and whales, but also for sea turtles.

The Cotylorhiza tuberculata beautiful and elegant lends itself well to underwater photography and video footage, making itself admired by all those who love the sea. This video is particularly interesting because I have never encountered a Mediterranean Cassiopea stormed and completely surrounded by so many fry of Caranx crysos.