Fried Egg Jelly

Cotylorhiza tuberculata can reach 40 cm (16 in) in diameter, but is usually less than 17 cm (6.7 in) wide. This jellyfish's sting has very little or no effect on humans; however, it can cause allergies in more sensitive people. These allergies usually involve itching and scratching in the stung area. The cnidarian's smooth, elevated central dome is surrounded by a gutter-like ring. Its marginal lappets are elongated and subrectangular. Each mouth arm bifurcates near its base and branches several times. In addition to some larger appendages, there are many short, club-shaped ones that bear disk-like ends.

C. tuberculata primarily consume minuscule aquatic organisms, often a mixture of phytoplankton and zooplankton. They do not demonstrate a very high feeding diversity on the taxonomic level; it has been recorded that anywhere between 69% and 82% of their diet consists of organisms associated with the genus Spiroplasma. These prokaryotes have also been found in the diets of several other jellyfish species. Furthermore, the C. tuberculata's diet likely consists of only three to four main taxa of microplankton. The jellyfish takes in these tiny organisms through its mouth arms, from where they travel to its stomach. The interconnectedness of the Mediterranean jelly and its surrounding waters allows for an easy flow of plankton into its gastric cavity.

One of the main issues created by annual blooms of C. tuberculata is an interference with human recreational and financial activities. The usual water-related activities of tourism, in addition to more commercial activities such as fishing, are often disrupted due to the sheer number of jellyfish in the waters. This often results in the removal of thousands of Mediterranean jellies from the waters by coastal officials in the summers by fishing boats or large nets.