Jellyfish is a very beautiful aquatic animal. Its body is shaped like a transparent umbrella. The diameter of the umbrella body can be large or small. The diameter of the large jellyfish's umbrella body can reach 2 meters. There are some whisker-like tentacles on the edge of the umbrella body, and some tentacles can be 20-30 meters long.
The main component of the body of jellyfish is water. When they move, they use the water spray reflection in their bodies to move forward. From a distance, they look like a round umbrella floating rapidly in the water; some jellyfish have various patterns on their umbrellas. In the blue ocean, these swimming jellyfish of different colors look very beautiful.
Bright pink jellyfish on dark blue background.
They are found in tropical waters, temperate waters, shallow waters, oceans about a hundred meters deep, and even freshwater areas. Jellyfish were first born 580 million years ago and have experienced almost five mass extinctions of species on the earth. They are still very common in the ocean today. There are currently about 250 species of jellyfish in the world. This little guy, whose body contains more than 95% water, is estimated to have mastered the trick of adapting to changes in the earth's environment.
Chinese scientists discovered a type of "eight-armed fairyworm" fossil in Guizhou about 580 million years ago, which was confirmed to be the oldest metazoan macrofossil discovered so far. It is reported that the eight-armed fairyworm fossil is the earliest It was discovered and named by Tang Feng and others in Jiangkou County, Tongren, Guizhou. It exists in the Ediacaran strata earlier than the Cambrian period, and the age range of the fossils is approximately 551 million to 580 million years ago. Subsequently, similar impression fossils were also discovered in Australia. In the past two years, through systematic excavations in the same place of origin, researchers have collected fossils of the eight-armed fairy worm with more obvious and complete preservation of morphological and anatomical features. Research shows that the eight-armed fairy worm is eight-radially symmetrical and can be divided into eight equal parts, which is completely similar to the modern ctenophores !
All jellyfish are carnivores, and they feed on fish and plankton. When hunting, jellyfish are passive and only prey on animals that swim close to them.
They use stinging cells on their tentacles to sting or kill prey, and then deliver the food to the mouth and digestive cavity. Most jellyfish are almost transparent, making them difficult for enemies to spot. Some jellyfish can emit light, but even with this beautiful appearance, they rely on the faint light emitted by their bodies to attract prey.
