Color: light green, blue purple, red, yellow, rainbow, white, pink, blue to deep purple, etc. Originally, jellyfish are colorless and transparent in water, but stick figures are different from portraits and can be painted in many colors.

Jellyfish has three germ layers, the outermost layer is epidermis and the innermost layer is gastric cortex. The gastric cortex constitutes a simple body cavity with only one opening, which has the functions of mouth and excretion, and the mesothelium is between the epidermis and the gastric cortex. Take jellyfish as an example. Jellyfish bodies have several structures.

Living habits

Cruciferae jellyfish is a kind of potted jellyfish with a fixed life. Its body is a combination of hydra and jellyfish, which looks like an inverted horn. The upper umbrella surface extends into a handle shape, the end of which is fixed by a bottom plate, the lower umbrella surface faces upwards, the umbrella is cup-shaped, the umbrella edge has 8 sides, there are 8 clusters of short tentacles, and there is no tentacle sac, and each cluster of tentacles has only one sensory corpuscle;

The mouth of the quadrangle is located in the center of the lower umbrella. There are four leaflets around the mouth, and there are gastric sacs and partitions in the gastric cavity. Floating wave larvae have no cilia and develop into adults through fixation after crawling. It is often distributed in cold seawater and feeds on seaweed, such as trumpet jellyfish and high-glass jellyfish.