The stinging sac of jellyfish tentacles contains venom, which can release inflammatory factors. People are poisoned after touching it. Within a few minutes after being stung, they feel itchy, numb and burning, and then the skin appears erythema, papules, etc., and even petechiae and even blisters appear in severe cases, which are distributed in a linear way. After being stung by jellyfish, the affected area should be washed with alkaline lotion immediately.

When encountering jellyfish, you should avoid touching them with your hands, even dead jellyfish. If you are stung by jellyfish, you should wash the affected area with seawater in time and go to the hospital in time.

Morphological characteristics of jellyfish

Jellyfish usually live in a single, floating or swimming life. Very few species are groups, and some groups can live in a fixed life. Jellyfish-shaped body is bell-shaped or inverted bowl-shaped, or umbrella-shaped. The outward protruding side is called exumbrella surface or upper umbrella surface, and the concave side is called subumbrella surface.

There is a hanging tube called manubrium in the center of the lower umbrella surface, the free end of the manubrium is the mouth, and there is a circle of tentacles at the edge of the umbrella. The edge of the lower umbrella of the Lepidoptera protrudes inward with a narrow membrane-like structure called velum, which is the characteristic of Hydrozoa. Jellyfish in the pot jellyfish have no membrane.

Baidu Encyclopedia-Jellyfish