Jellyfish are the oldest living creatures on our planet. They are amazing and unusual, which is why they cause enthusiastic views. They live in all seas, all oceans – on the surface of the water or several kilometers deep.
It is better for a person not to encounter certain types of jellyfish – for example, the “Australian wasp” can kill up to 60 people with its poison. It is the most venomous and dangerous animal in the oceans. Medusa got its name from the similarity with the mythological character (or rather, with its head) – the Gorgon Medusa. If you open one of the images to look at it, notice that instead of hair, it has moving snakes on its head. The similarity was noticed by Carl Linnaeus, a Swedish naturalist (1707-1778.)
You can admire them endlessly … But let’s not only admire their beauty, but also find out the 10 most interesting facts about jellyfish. So let’s get started?
10. Appeared on the planet about 650 million years ago
Medusa is a long liver. They have always been, are and will be. These creatures appeared 650 million years ago. Without them, not a single ocean is represented. Some species of jellyfish live in fresh water. About 3000 species are known, but most of them have not yet been studied.
Getting to jellyfish is not so easy, because some representatives live very deep in water – more than 10,000 meters. Some compare these centenarians to fish, but they have nothing in common except their habitat. Most clusters of jellyfish have their own definition – they are called a swarm (meaning cluster).
9. They live in all the seas and oceans of the Earth
Incredibly beautiful and diverse creatures live in the seas and oceans, including the jellyfish. The underwater world is little studied, so a meeting with various creatures can turn into a disaster for a person.
If you ask someone:Who do you think is the most dangerous inhabitant of the underwater world?then, for sure, everyone will respond unanimously: “Shark”, however, there are creatures and more dangerous…
Every year, millions of people are exposed to “burns” when interacting with jellyfish. There are no particularly dangerous jellyfish in the Russian seas, but the main thing is to avoid contact with mucous membranes. Jellyfish live in all the oceans of the Earth and in almost all the seas.therefore, before traveling, you should know in advance what species are common there.
8. live in fresh water
It is known that jellyfish can only live in water. If they are thrown to the ground, death will come from desiccation in the sun. There is a species that does well in fresh water – it’s called Craspedacusta sowerbyi. Such a jellyfish is quite possible to keep in a home aquarium, but it requires certain food and conditions.
Freshwater jellyfish live on almost all continents (except Antarctica) in quietly flowing river backwaters and stagnant reservoirs. Also favorably Craspedacusta sowerbyi lives in artificial ponds.
7. Four main classes of jellyfish
In nature, many types of jellyfish are known, and despite the primitive structure, they are all very diverse. There are four main classes of jellyfish: these are the scyphoids, hydroids, box jellyfish and staurozoa. Let’s consider these types in more detail.
Scyphoid: this class includes the jellyfish that inhabit the seas and oceans. They live in salt water and move freely in the underwater world (with the exception of a sedentary jellyfish – it is inactive).
Hydroid: this species differs from others in its amazing ability – a jellyfish can live forever, as the hydroid is regenerated from an adult organism to a child. They include more than 2.5 thousand species.
box jellyfish: this species can be called the most dangerous (it is called “sea wasp”). If a person meets him, a fatal outcome awaits him. During the Second World War, it was this jellyfish that became the scourge of sailors who found themselves in the water. About 80 people die each year from jellyfish venom.
Staurozoa: representatives of stauromedusa cannot swim and lead a bottom life. Their shape is quite peculiar, outwardly resembling a kind of funnel. Its movements are slow and most of the time the jellyfish prefers to sit in one place. Stauromedusa is considered an unusual organism that combines the features of a polyp and a jellyfish.
6. Used in medicine and food
Jellyfish are a delicacy in Eastern countries. In Japan, Korea, China, these underwater creatures have been eaten since ancient times, calling them “crystal meat”and these dishes belonged to the exquisite and delicacies.
It is also known that jellyfish were part of the diet of the ancient Romans. Jellyfish meat contains a lot of useful substances, amino acids and trace elements.
In addition, jellyfish are also used in medicine.. Chinese doctors advise eating gray jellyfish (processed, of course) every day for those suffering from infertility. By the way, Chinese women confirm the effectiveness of this method. Interestingly, a remedy is also prepared from jellyfish to help get rid of baldness.
Interesting fact: if in China and South Korea there are no jellyfish dishes on the menu of a fish restaurant, the institution cannot receive the highest category.
5. Jellyfish are one of the simplest animals in the world.
Jellyfish are amazing creatures. They cause contradictory feelings: joy, admiration and even fear. The oldest animals on our planet belong to the simplest intestinal organisms.. The jellyfish has no brain or sensory organs. But they have a nervous system that helps them detect smells and light. Jellyfish also use it to detect the touch of another organism.
There are only 8 isolated clusters of nerve cells in a jellyfish – they are located along the edge of the jellyfish’s umbrella. Its nerve clusters are called ganglia.
4. Almost 98% water
This fact may come as a surprise, but jellyfish are 98% water. When the jellyfish dries up, there is only a trace left in the sand, there is not even a shell. Among marine animals, not only jellyfish have a jelly-like body, for example, sea anemones, hydras, polyps, corals also do not have a strong skeleton and all live in the water of Wed.
Despite the fact that the jellyfish is 98% water, it causes painful burns.
3. Turitopsis nutricula – an immortal living creature
What is Turritopsis nutricula’s secret of youth? This jellyfish is the only creature that can live forever. When it reaches maturity, it becomes a young individual again. It should be noted that this cycle repeats itself indefinitely… The only thing that can cause Turritopsis nutricula to die is to be killed.
Note that biologists also know of “immortal” cells capable of dividing countless times under favorable conditions. An example is stem cells.
2. The sea wasp is the most dangerous creature on the planet.
The sting of a sea wasp (box jellyfish) can be fatal. It is one of the most dangerous inhabitants of the underwater world.. The sea wasp can be identified by the size of the bell – 2.5 meters. It has a transparent shell, it has a beautiful appearance. It lives in the Pacific region of India, as well as on the coasts of the Australian continent.
With their tentacles, sea wasps kill hundreds of people each year, but the jellyfish does not sting when it does not feel in danger.
1. Giant arctic jellyfish – the largest in the world
Arctic jellyfish – considered the largest in the world. It lives in the Northwest Atlantic. Its giant dome can reach 2 meters, and its translucent tentacles grow up to 20 meters in length. It has a different color, but usually light orange is found (with age the color becomes more saturated).
His body is 95% liquid and shaped like a mushroom. Many jellyfish tentacles can extend up to 20 meters.
Interesting fact: The giant arctic jellyfish is featured in Arthur Conan Doyle’s short story “The Lion’s Mane.”