What does a jellyfish look like?

Question 1: What exactly is a jellyfish? Jellyfish (jellyfish) is a kind of lower marine invertebrate zooplankton and carnivore. Taxonomically, it belongs to coelenterata (also known as Echinotheca) and Scyphozoa, with about 200 known species. Or Cubozoa species, which used to be considered as an order of Cephalopods. The term jellyfish also refers to jellyfish-shaped (bell-shaped or dish-shaped) spiny animals in a broad sense, such as hydra jellyfish, tube jellyfish (including curly-tailed jellyfish) and comb jellyfish, as well as sea urchins that do not belong to the class of algae-eating. This kind of jellyfish can be divided into two types: swimming jellyfish without U and sedentary jellyfish (stems attached to seaweed and other objects). Hydra species living in a fixed life constitute the order Stauromedusae. Jellyfish is shaped like a transparent umbrella with different diameters. The diameter of mother jellyfish's umbrella can reach 2 meters. Some whisker-like strips grow from the edge of the umbrella. They are called antennae. Some tentacles can be as long as 20 to 30 meters, which is equivalent to the length of a big whale. Jellyfish floating in the water extend long tentacles around, and some jellyfish have umbrellas with various patterns. In the blue ocean, these swimming jellyfish with different colors are very beautiful. Jellyfish appeared before dinosaurs, dating back to 650 million years ago. There are many kinds of jellyfish, about 250 species in the world, ranging in diameter from 10 cm to 100 cm, which are common in the oceans all over the world. There are about 8 kinds of common species in China, namely sea moon jellyfish, Baixia jellyfish, jellyfish, jellyfish and so on. People often classify them according to their different umbrellas: some umbrellas emit silver light and are called silver jellyfish; Some umbrellas are like a monk's hat, called a monk's hat jellyfish; Some umbrellas are like white sails on a ship, called sail jellyfish; Some are like umbrellas, called umbrella jellyfish; Some umbrella-shaped bodies shine with rosy clouds, which are called chardonnay jellyfish ... most of them can only live for a few weeks, and some can live for about a year. Some deep-sea jellyfish can live longer. The umbrella of ordinary jellyfish is not very big, only 20 ~ 30 cm long, but the giant umbrella of larger summer jellyfish can reach 2 meters in diameter and the drooping tentacles can reach 20 ~ 30 meters. 1865, a jellyfish was washed ashore on the coast of Massachusetts, USA. Its umbrella is 2.28 meters in diameter and its antenna is 36 meters long. Pull open the tentacles of this jellyfish, which is 74 meters long from the top of one tentacle to the top of the other. Therefore, it can be said that jellyfish is the longest animal in the world. There are about 250 species of jellyfish in the world, ranging in diameter from 10 cm to 100 cm. They are common in oceans all over the world. Chrysaora species swim freely and are found in all oceans, including common discoid animals drifting along the coastline. Most of them can only live for a few weeks, and some people can live about 1 year. The diameter is generally 240 cm (1 16 inches), but some species are quite large, with a diameter of 2 meters (6.6 inches). 99% of the body composition is water, because the main body of almost all species is made of jelly. Most of them prey on small animals with spiny filaments on their antennae. Some species filter microorganisms and plants in water. Like all echinoderms, the body is composed of endoderm, and there is an interlayer between them (connective tissue layer composed of gelatinous substances). The mesothelium of jellyfish is thicker than that of other echinoderms, and it is floating and transparent. The life history of free-swimming true jellyfish can be divided into three periods. The fixed hydra can reproduce asexually, divide horizontally into larvae from top to bottom at the bowl mouth, and then divide into disks, and each disk-shaped body length becomes an adult. Adults are male and female, but some species often change sex. Embryos formed by the combination of many kinds of sperm and eggs hatch into floating larvae in adult digestive tract, but some of them develop in seawater. After leaving their parents, the floating wave larvae are fixed and grow into new bowl-mouth larvae after a short period of so-called tube larvae. This life history is unique to Semaeostomaea, and there are about 50 species of Semaeostomaea, mainly distributed in coastal areas, some of which are widely distributed. Such as Aurelia, Chrysaora and scarlet jellyfish (Tiburonia granrojo, belonging to Tiburoniinae), which is one of the three tentacleless jellyfish. There are about 30 species of Guansuborder, mostly distributed in the deep sea, often reddish brown. The body is bell-shaped, bounded by a deep annular groove between the central part and the peripheral part, and the peripheral part is divided into many wide petals. The marginal antennae are big and strong. ......& gt& gt

Question 2: What are the characteristics of jellyfish? Jellyfish usually live a single, floating or swimming life. Very few species are groups, and some groups can lead a fixed life.

All seafood. Generations alternate, but hydra type degenerates or does not exist, and jellyfish type is the main generation. Single, mostly large jellyfish, with thick mesoderm and complex structure. Neurosensory organs are well developed, including tentacle sac, eye point, balance stone, olfactory fossa and other structures, with light sensitivity, balance and chemoreceptor functions. The main difference between bowl jellyfish and hydra jellyfish is that there is no membrane. The digestive circulation cavity is complex, the radiation tube is developed, and the gastric filament originated from endoderm has stinging cells, so both endoderm and ectoderm of jellyfish have stinging cells. Gonadas originate from endoderm.

Question 3: What kind of animal is jellyfish? It is also called jellyfish. It is an ancient coelenterate. It floated in the ocean as early as 500 million years ago.

Jellyfish is a very beautiful aquatic animal. Although it has no spine, its body is very huge, and its huge body is mainly supported by the buoyancy of water. Jellyfish is shaped like a transparent umbrella with different diameters. The umbrella of the big jellyfish can reach 2 meters in diameter. Some whisker-like strips grow from the edge of the umbrella. They are called antennae. Some tentacles can be as long as 20 to 30 meters, which is equivalent to the length of a big whale. Jellyfish floating in the water extend long tentacles around, and some jellyfish have umbrellas with various patterns. In the blue ocean, these swimming jellyfish with different colors are very beautiful. Jellyfish appeared before dinosaurs, dating back to 650 million years ago. At present, there are about 200 species of jellyfish found in the world, and there are about 8 common species in China, namely Haiyue jellyfish, Baixia jellyfish, jellyfish and crested jellyfish. The tentacles of jellyfish are covered with stinging cells, just like small beans stuck to the tentacles. This stinging cell can shoot poisonous silk. When it meets an "enemy" or prey, it will shoot poisonous silk to scare off or poison the "enemy". There is a small ball on the thin handle in the middle of the jellyfish tentacles, and there is a small "listening stone" in it, which is the "ear" of the jellyfish. Scientists simulated the sound wave transmission organs of jellyfish and found that they could detect its information 15 hours before the arrival of the ocean storm. Although jellyfish is very beautiful and comfortable in water, it can't live without water. The water content of jellyfish reaches 98%, and its eating, digestion and excretion must be completed in water. Without water, jellyfish's body will become smaller and uglier. Jellyfish is more dangerous than cobra. A few years ago, the American World Wildlife magazine listed 10 species of the most poisonous animals in the world, and the box jellyfish living in the ocean ranked first. Box jellyfish, also known as sea wasps, belong to coelenterates and mainly live in the coastal waters of northeast Australia. An adult box jellyfish the size of a football is mushroom-shaped and almost transparent. An adult box jellyfish has billions of poison sacs and needles on its tentacles, enough to kill 20 people. The toxicity is obvious. Its venom mainly damages the heart. When the venom of box jellyfish invades the human heart, it will destroy the consistency of the beating rhythm of human cells, thus making the heart unable to supply blood normally and leading to rapid death. The largest jellyfish is the arctic jellyfish distributed in the northwest Atlantic. 1870, an arctic jellyfish was washed into Massachusetts bay, USA. Its umbrella is 2.28 meters in diameter and its antenna is 36.5 meters long. The smallest jellyfish is only 12 mm long. When the comb jellyfish swims in the sea, it will emit blue light, and when it shines, it will become a dazzling colorful ball; When it swims, the light band swings with the waves, which is very beautiful. At present, biologists in Singapore are conducting an experiment to transplant the luminescent genes of jellyfish into other fish. Powerful and deadly jellyfish also have natural enemies. A kind of turtle can shuttle freely in jellyfish, and its tentacles can be easily broken with its mouth, so that they can only roll up and down, and finally lose their resistance, which becomes a "good meal" for turtles.

Question 4: What's under the jellyfish? Jellyfish are lower coelenterates and carnivores, belonging to coelenterata and Cephalopoda in taxonomy. Jellyfish is shaped like a transparent umbrella with different diameters. The umbrella of the big jellyfish can reach 2 meters in diameter. Some whisker-like strips grow from the edge of the umbrella. They are called antennae. Some tentacles can be as long as 20 to 30 meters, which is equivalent to the length of a big whale. Jellyfish floating in the water extend long tentacles around, and some jellyfish have umbrellas with various patterns.

It's called tentacle

Question 5: What kind of animal is jellyfish? It is an important plankton in the ocean. Jellyfish have a short life span, averaging only a few months. Jellyfish is an invertebrate, belonging to the phylum coelenterata. There are more than 200 species of jellyfish in the world's oceans, which are distributed in waters all over the world. The largest is more than two meters long and one and a half meters wide, and the smallest is only about five millimeters. Some jellyfish are poisonous, while others are not. Some jellyfish are fluorescent.

Question 6: What is Jelly Fish? Jellyfish is an important plankton in the aquatic environment, belonging to Echinoclada. Jellyfish is a very beautiful aquatic animal. Its shape is like a transparent umbrella, and the diameter of the umbrella is large or small. The diameter of the umbrella of the big jellyfish can reach 2 meters. The edge of the umbrella has some whisker-like tentacles, some of which can be as long as 20-30 meters.

The main component of jellyfish body is water, which consists of endoderm and ectoderm. There is a thick skin between the two layers, which is not only transparent, but also floating. When they are in motion, they use the reflection of water spray in their bodies to move forward. From a distance, they look like a round umbrella floating fast in the water. Some jellyfish have umbrellas with colorful patterns. In the blue ocean, these swimming jellyfish of different colors look very beautiful.

They are found in tropical waters, temperate waters, shallow waters, oceans about 100 meters deep, and even fresh water areas. Jellyfish existed 650 million years ago, even before dinosaurs. There are more than 250 species of jellyfish in the world waters, which are distributed in the waters all over the world. They all live in the ocean.

Question 7: What is this jellyfish? The red moon jellyfish is the so-called jellyfish. It looks like a mushroom and is divided into two parts: the umbrella part and the mouth and wrist. The umbrella is hemispherical, with a diameter of 300 ~ 600 mm and a maximum length of 1 m. The surface of the outer umbrella is smooth and the rubber layer is thick and crystal clear. There are 8 sensors at the edge of the umbrella, and 1/8 umbrellas have 16 ~ 22 flaps. The adaptive range of jellyfish to water temperature is 65438 05℃ ~ 32℃, and the suitable water temperature is 20℃ ~ 24℃. The adaptive range of salinity is 8~32, and the suitable salinity is 18~26. I like the weak light environment with light intensity below 2400 Le. Red crescent jellyfish nettle jellyfish is the so-called jellyfish in Chinese. It looks like a mushroom and is divided into two parts: the umbrella part and the mouth and wrist. The umbrella is hemispherical, with a diameter of 300 ~ 600 mm and a maximum length of 1 m. The surface of the outer umbrella is smooth and the rubber layer is thick and crystal clear. There are 8 sensors at the edge of the umbrella, and 1/8 umbrellas have 16 ~ 22 flaps. The adaptive range of jellyfish to water temperature is 65438 05℃ ~ 32℃, and the suitable water temperature is 20℃ ~ 24℃. The adaptive range of salinity is 8~32, and the suitable salinity is 18~26. I like the weak light environment with light intensity below 2400 Le.

Question 8: What kind of jellyfish is this? Red Moon Jellyfish, also known as Rise of the Legend Jellyfish, is actually a small jellyfish, but jellyfish and jellyfish have the same phylum, but they are different, so they can be regarded as a kind of jellyfish. The name of the red moon is based on the artificial evolution of the ocean and the moon.