Phacellophora camtschatica (Egg-yolk jelly)

Phacellophora camtschatica, known as the fried egg jellyfish or the egg-yolk jellyfish, is a very large jellyfish, with a bell up to 60 cm (2 ft) in diameter and 16 clusters of up to a few dozen tentacles, each up to 6 m (20 ft) long. It has traditionally been included in the family Ulmaridae, but is now considered the only member of the family Phacellophoridae.

— Wikipedia