The tentacles of jellyfish are its defensive weapons. There are many stinging cells on the tentacles of jellyfish. In addition to the cytoplasm and nucleus, there is also a filament sac with a small filamentous tube inside, which is the filament. There are two needles outside the stinging cell. Once the enemy is hurt, the needle in the barbed wire bag will be fired, and at the same time, it will release corrosive venom and directly stab the enemy. The stinging sac of fresh jellyfish contains venom, which is composed of a variety of substances rich in skin. People who catch jellyfish or swim at sea will be injured by touching the tentacles of jellyfish, causing redness, swelling, heat and pain, epidermal necrosis, and symptoms such as chills, irritability, chest tightness and unbearable wound pain. Severe cases may be life-threatening due to dyspnea and shock.

Jellyfish (jellyfish, or jellyfish, nettle) jellyfish. The bulge of the umbrella is steamed bread-shaped, with a diameter of 50 cm and a maximum of about 1.5 m. Chewing gum is hard, usually blue-green. The tentacles are milky white. There are eight mouths and wrists, divided into many petals. Widely distributed in the north and south seas of China. It can be eaten or used as medicine. Jellyfish, commonly known as jellyfish, stone mirror, wax, bottle, squid, jellyfish fresh and sea (insect shed) and so on. Jellyfish is a coelenterate living in the ocean. It is hemispherical and edible. It has an umbrella-shaped white top, called jellyfish skin, and there are eight mouths and wrists under it, which are grayish red and called jellyfish head.

Coelenterates. The umbrella bulges like steamed bread, with a diameter of 50 cm and a maximum of one meter. The gums are hard, usually blue-green, and the tentacles are ivory. There are eight mouths and wrists, divided into many petals. Widely distributed in the northern and southern waters of China. Especially in the coastal areas of Zhejiang. It can be eaten or used as medicine. Jellyfish (Rhopilema) is a general term for Jellyfish, Rhizopus and Jellyfish. Plankton in the camping ocean. The bulge of adult umbrella is hemispherical, the umbrella surface is smooth and the rubber layer is thick. Umbrella diameter is 25 ~ 60, and the longest is 1 m. There are eight notches on the edge of the umbrella, and each notch has 14 ~ 22 tongue-shaped side lobes. No umbrella tentacles. Eight mouths and wrists, three wings. Each wrist has about 150 ~ 180 filaments and 30 ~ 40 rods. The big mouth disappears, and small animals and plants are sucked away by the small suction port on the edge flap. The inner umbrella has developed annular muscles. China is widely distributed along the coast, especially in Zhejiang and Fujian. From August to September every year, they appear on the sea in droves. It can be cultivated artificially, and has been released artificially, increasing resources. It can be eaten or used as medicine. Umbrella is commonly known as "prickly skin" and mouth and wrist as "prickly head".