These species all belong to the phylum Coelenterata.
Coelenterata
An order of animals. The body is radial or bi-radial symmetrical, with only a dicotyledonous layer, and is the most primitive of all the post-humans. About 10,000 species
Jellyfish are classified in the genus Jellyfish under the family Jellyfishidae in the order Jellyfish, which refers to a wider range than jellyfish. Jellyfish are just one type of jellyfish in the larger category.
These species all belong to the phylum Coelenterata.
The coelacanth body wall consists of an ectoderm, an endoderm, and a mesoderm. The endoderm encloses the entire inner cavity of the body called the digestive circulation cavity, the cavernous intestine at one end is the mouth, his end is occluded, no anus. There are stinging cells in the body wall, so it is also called stinging cell animals. The skeleton of coelenterates is mainly exoskeleton, which has the function of support and protection. It is mostly composed of chitin, keratin and limestone. In many corallites have bony needles or shafts, which are present in the mesocoelom, or protrude from the surface of the body.
Coelenterates have both asexual and sexual reproduction methods and tend to occur in the life history of the same species, i.e., hydrozoan-type generations spawn by asexual outgrowth
Jellyfish, also known as jellyfish, are coelenterates. Jellyfish body soft, no hard bones. The whole body is divided into upper and lower parts, the upper part is a round umbrella, looks like a hat and mushrooms, the lower part of the hanging with many whiskers, called wrists or tentacles. In the sea water, jellyfish is like a mass of translucent gelatinous body, seems to be formed and unformed, sometimes up and down, with the waves. The poem of Shen and Qiu in Song Dynasty says, "The jellyfish is like a black hat with no tassel, and the seven orifices of the chaos are not yet shaped. The block is carrying a group of shrimp line, contempt for its clever to strange from the presentation." The poem also has a lot of records in the ancient texts. There are also many ancient records, the more detailed is Li Shizhen's "Compendium of Materia Medica" book: jellyfish "as big as a bed, as small as a bucket, no eyes, eyes, stomach and stomach, shrimp for the eyes, shrimp snake sinking". Large jellyfish umbrella diameter of up to 1 meter. Sand jellies umbrella diameter of 1.6 meters, weighing 175 kilograms. Face sting slightly smaller, umbrella diameter of about 40 centimeters. Jellyfish umbrella is greenish blue or dark red or dark brown.