The diameter of the umbrella is 300 ~ 600 mm, and the longest can reach 1 m. There are eight notches on the umbrella rim, each notch has 14 ~ 22 tongue-shaped petals, and there are no tentacles on the umbrella rim. There are eight wrists with three airfoils, and each wrist has about 150 ~ 180 filaments and 30 ~ 40 rods.
Jellyfish, commonly known as jellyfish, stone mirror, wax, bottle, cattail fish, fresh jellyfish 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. Widely distributed in the northern and southern seas of China, especially in the coastal areas of Zhejiang, it is edible.
Living habits
Jellyfish is a spiny animal. It has no special respiratory and excretory organs. Because the human body is composed of two layers of cells surrounding the gastric circulation cavity, and the gastric cavity communicates with the outside world through the mouth, in fact, the two layers of cells on the body wall are in contact with the outside environment, so the respiratory and excretory functions can be directly and independently carried out by the body wall cells. The water flow in the water outlet, water inlet and stomach cavity can bring in fresh oxygen and take away metabolites.
Echinosaurus is a carnivore, feeding on plankton, small crustaceans, polychaetes and even small fish. Due to the mechanical and chemical stimulation of food, hydra elongate their tentacles, release stinging silk sacs to entangle, paralyze and poison their prey, and then send food into their mouths. Mucus secreted by gland cells in oral area is beneficial to food swallowing. After food enters the gastric cavity, gland cells in the gastric layer begin to secrete protease, which decomposes and digests food to form many peptides.