Egg yolk jellyfish (scientific name: Cotylorhiza tuberculata) is a marine creature of Cephalopoda. There is also a name with the same name as the banshee in Greek mythology, "Medusa". The main stages of life history are haplotype and jellyfish type, and the hydra type stage is underdeveloped. Large size, no edge film; The gastric circulation cavity is complex, the radiation tube is developed, and there are gastric filaments with endoderm origin, and there are stinging cells on the gastric filaments. Germ cells originate from endoderm and have developed nerve sensory organs, which form 8 sensory organs in a concentrated way. Learn from marine life. The weapon of jellyfish is harpoon tentacles. When they come into contact with prey, they will shoot the venom of stinging cells on their antennae and prey on prey. Similar in appearance to boiled eggs, it is the most common jellyfish in the Mediterranean and also distributed in the Aegean Sea and Adriatic Sea.