Aurelia jellyfish eared. Sea wasp - poisonous jellyfish How jellyfish adapted to the marine environment

Aurelia jellyfish is a species of marine life that is very interesting and mysterious. Therefore, they are often kept in aquariums. This article contains information about who the aurelia jellyfish is: description, features of the content, reproduction of this species.

general description

In Aurelia, the umbrella is flat and can reach 40 cm in diameter. Since it is based on a non-cellular substance (it consists of 98% water), it is completely transparent. This quality also determines that the weight of these animals is close to the weight of water, which greatly facilitates swimming.

It should be noted that the Aurelia jellyfish has a very interesting structure. So, along the edge of her umbrella there are tentacles - small, but mobile. They are very densely seated with a huge number of stinging cells.

This jellyfish has a quadrangular mouth, has 4 movable blades along the edges. Their contraction (they are covered also makes it possible to pull the prey to the mouth and securely capture it.

Issues of keeping jellyfish differ in some specifics. Initially, it was in aquariums. For jellyfish, special containers are needed that provide a circular smooth flow. This allows the animals to move freely without fear of any collision. This is important because the Aurelia, or eared jellyfish, has a very delicate and soft body that is easily damaged.

It is necessary to ensure the correct flow rate, which should allow the animals to “soar” without problems in the water column. Only in this case, there should be no danger of harm to their bodies.

The specificity also lies in the fact that the use of aeration is absolutely excluded for jellyfish in aquariums. This is due to the fact that air bubbles can be under the dome of the animal, get stuck there and then pierce it, which is very dangerous and can lead to the death of the jellyfish.

They do not need special lighting either, mostly simple lighting is enough.

Also note that there is no need for water filtration. As a rule, only regular water changes are sufficient to ensure that its quality always remains at the proper level. If there is no desire to constantly update the water, you can also start installing a life support system. At the same time, it is important to take proper care of the protection of animals. Because they can be pulled into the intake devices.

In addition, it must be borne in mind that the Aurelia jellyfish must live in a fairly spacious aquarium, since it needs the ability to freely extend its tentacles to their full length.

Feeding

How are jellyfish fed? They are great with a mixture that consists of brine shrimp, phytoplankton, heavily crushed crustaceans and seafood. Although at the moment there are various ready-made foods on sale that Aurelia (eared jellyfish) can also eat. But there is one feature. If the animals do not like the food at all, they can start eating the rest of the jellyfish.

reproduction

Aurelia jellyfish is dioecious. So, the testes in males are milky white, they are perfectly visible: these are small half-rings in the body of the animal. Females have purple or red ovaries, which are also visible in the light. Therefore, by coloring, you can understand what gender the jellyfish is. Aurelias breed only once in their life, and then die. Their main distinguishing feature is the manifestation of concern for their own offspring (which is not typical of other species).

It is worth noting that the fertilization of eggs, as well as their further development, takes place in special pockets. Eggs enter them through the gutters from the mouth opening. After fertilization, the egg divides into 2 parts, each of which is further divided in half, and so on. Due to this, a single-layer multicellular ball is formed.

Some of the cells of this ball gets inside, which can be compared with pressing a rubber ball. Because of this, a two-layer embryo appears.

He can swim, thanks to the large number of cilia that are located on his outer part. The embryo then becomes a larva, which is called a planula. For some time it just floats, and then falls to the bottom. It is attached with its front end to the bottom. Quite quickly, the back end of the planula is transformed: a mouth appears in this place, and tentacles are also formed. And it becomes a polyp, from which small jellyfish are subsequently formed.

Aurelia jellyfish is often used in medicine. Laxatives and diuretics were produced from it in the Middle Ages. And today, from the poison that is contained in the tentacles of animals, they develop means to regulate pressure and treat various pulmonary diseases.

Farmers in the Caribbean use physalium poison as a poison for rodents.

Jellyfish allow you to effectively deal with stress. They are bred in Japan in special aquariums. Slow, smooth movements of animals calm people down, while keeping them is very expensive and troublesome.

Phosphors isolated from jellyfish are used for biochemical analysis. Their genes were transplanted into various animals, for example, rodents, due to which biologists were able to see with their own eyes processes that were previously inaccessible. Because of this action, the rodents began to grow green hair.

Some of the jellyfish are caught off the coast of China, where their tentacles are removed, while the carcasses are kept in a marinade, due to which the animal turns into a cake of thin, delicate, translucent cartilage. In the form of such cakes, animals are taken to Japan, where they are carefully selected for quality, color and size and used in cooking. So, for one salad, the jellyfish is cut into small strips 3 mm wide, they are mixed with herbs, poached vegetables, and then poured with sauce.

Robot jellyfish also appeared there. They, unlike real animals, not only swim beautifully and slowly, but can also “dance” if the owner wishes to the music.

Conclusion

Despite the fact that the Aurelia jellyfish is very common, it cannot be called completely ordinary. In principle, these are very curious creatures, therefore, observing them and keeping them will be very exciting.

To the question of how long jellyfish live, scientists do not give a definite answer. Many agree that the life cycle of these animals is short and the life span of most species is two to six months.

Recently, zoologists have discovered that among the representatives of this species there are specimens that never die and are always reborn. That is why the jellyfish Turitopsis Nutrikula is considered to be the only immortal creature on the planet.

Who are jellyfish

Zoologists, speaking of jellyfish, usually mean all mobile forms of intestinal cnidarians (a group of multicellular invertebrate representatives of the animal world) that catch and kill their victims with the help of tentacles.

These amazing animals live only in salt water, and therefore they can be found in all oceans and seas of our planet (except inland), sometimes in closed lagoons or lakes with salt water on coral islands. Among the representatives of this class there are both heat-loving animals and those who prefer cold waters, species that live only near the surface of the water, and those that live only at the bottom of the ocean.

Jellyfish are solitary animals, because they do not communicate with each other in any way, even if the currents bring them together, thus forming a colony.

These creatures got their modern name in the middle of the 18th century thanks to Karl Liney, who hinted at the mythical head of the Gorgon Medusa, with which he noticed similarities in these representatives of the animal world. Such a name is not without reason, since these animals are similar to it.

This amazing animal is 98% water, and therefore has a transparent body with a slight tint, which in appearance resembles a jelly-like bell, an umbrella or a disk that moves by contracting the muscles of the bell wall.

Along the edges of the body are tentacles, the appearance of which directly depends on what species it belongs to: in some they are short and thick, in others they are long and thin. Their number can vary from four to several hundred (but always a multiple of four, since representatives of this class of animals are characterized by radial symmetry).

These tentacles are composed of string cells that contain poison and are therefore directly intended for hunting. Interestingly, even after death, jellyfish are able to sting for another half a month. Some species can be deadly even to humans. For example, an animal known as the "Sea Wasp" is considered the most dangerous poisonous animal in the world's oceans: scientists say that its poison is enough to poison sixty people in a few minutes.

The outer part of the body is smooth and convex, while the underside resembles a bag. In the center of the lower part there is a mouth: in some jellyfish it looks like a tube, in others it is short and wide, in others it resembles short maces. This hole also serves to remove food debris.

These animals grow throughout their lives, and their size largely depends on the species: among them there are very small ones, no more than a few millimeters, and there are also huge ones, whose body size exceeds two meters, and together with tentacles - all thirty ( for example, the largest jellyfish in the world's oceans, Cyanea, which lives in the Northwest Atlantic, has a body size of more than 2 m, and with tentacles - almost forty).

Despite the fact that these marine animals do not have brains and sensory organs, they have light-sensitive cells that act as eyes, thanks to which these organisms are able to distinguish darkness from light (they are, however, not able to see objects). Interestingly, some specimens glow in the dark, while in species living at great depths, the light is red, and those that live closer to the surface are blue.

Since these animals are primitive organisms, they consist of only two layers, connected thanks to a special adhesive substance - mesoglia:

• external (ectoderm) - a kind of analogue of the skin and muscles. The rudiments of the nervous system and germ cells are also located here;
• internal (endoderm) - performs only one function: digests food.

Ways of transportation

Since all representatives of this class (even the largest individuals, whose weight exceeds several centners) are almost unable to resist sea currents, scientists consider jellyfish as representatives of plankton.

Most species still do not completely succumb to water flows, and although slowly, they move using the current and thin muscle fibers of their body: contracting, they fold the body of a jellyfish like an umbrella - and the water that is in the lower part of the animal is sharply pushed out.

As a result, a strong jet is formed, pushing the animal forward. Therefore, these sea creatures always move in the direction opposite to the mouth. Where exactly they need to move, they are helped to determine the organs of balance located on the tentacles.

Regeneration

Another interesting feature of these creatures is their ability to restore lost body parts - absolutely all the cells of these animals are interchangeable: even if this animal is divided into parts, it will restore them, thus forming two new individuals! If this is done with an adult jellyfish, an adult copy will appear, from a jellyfish larva - a larva.

reproduction

Looking at these amazing translucent creatures, many people ask themselves the question of how jellyfish reproduce. Reproduction of jellyfish is an interesting and unusual process.

Answering the question of how jellyfish reproduce, it is worth noting that in this case, it is possible both sexual (they are of different sexes) and vegetative reproduction. The first involves several stages:

1. In these animals, the germ cells mature in the gonads;
2. After the eggs and spermatozoa mature, they come out through the mouth opening and are fertilized, resulting in the appearance of a jellyfish larva - planula;
3. After some time, the planula settles to the bottom and is fixed on something, after which a polyp appears on the basis of the planula, which reproduces by budding: on it, layering on each other, daughter organisms form;
4. After some time, they peel off and swim away, representing a born jellyfish.
   Reproduction of some species is somewhat different from this scheme. For example, the pelagic jellyfish does not have a polyp stage at all - the cubs appear directly from the larva. But bougainvillea jellyfish, one might say, are born, since polyps are formed directly in the gonads, without separating from adults, without any intermediate stages.

Nutrition

These amazing animals are the most numerous predators of our planet. They feed mainly on plankton: fry, small crustaceans, fish caviar. Larger specimens often catch small fish and smaller relatives.

So, jellyfish see almost nothing and do not have any sense organs, they hunt with the help of stringing tentacles, which, having caught the touch of edible food on them, instantly inject poison into it, which paralyzes the victim, after which the jellyfish eats it. There are two more options for catching food (much depends on the type of jellyfish): the first - prey sticks to the tentacles, the second - gets entangled in them.

Classification

There are the following types of jellyfish, which differ from each other in structure.

hydrojellyfish

Hydroid jellyfish are transparent, small in size (from 1 mm to 3 cm), four tentacles and a long tube-shaped mouth are attached to the body. Among the prominent representatives of hydrojellyfish is the jellyfish Turritopsis nutricula: the only creature discovered by people, about which scientists have declared that it is immortal.

Having reached maturity, it sinks to the bottom of the sea, transforming into a polyp, on which new formations are formed, from which new jellyfish subsequently arise.

This process is repeated more than once, which means that it is constantly reborn, and can die only if some predator eats it. Here are some interesting facts about jellyfish that scientists recently told the world.

Scyphomedusa

Scyphoid jellyfish have a more complex structure compared to hydrojellyfish: they are larger than representatives of other species - the largest jellyfish in the world, the Cyanea jellyfish, belongs to this class. This giant jellyfish, about 37 meters long, is one of the longest animals on Earth. Therefore, she eats a lot: during her life, the largest jellyfish eats about 15 thousand fish.

Scyphomedusa have a more developed nervous and muscular system, a mouth surrounded by a huge number of stinging and tactile cells, and the stomach is divided into chambers.

Like all jellyfish, these animals are predators, but deep-sea ones also feed on dead organisms. The touch of a scyphoid jellyfish to a person is quite painful (the feeling if it were bitten by a wasp), and at the point of contact, a trace resembling a burn often remains. Her bite can also cause an allergic reaction or even a painful shock. Seeing this animal, it is advisable not to take risks and, passing by, do not touch it.

One of the brightest specimens of this species, in addition to the Cyanei jellyfish, is also the Aurelia jellyfish (the most typical representative) and the Golden jellyfish, an animal that can only be seen on the Rocky Islands archipelago in Palau.

The golden jellyfish is notable for the fact that, unlike its relatives, living only in the seas, it lives in the Jellyfish Lake, which is connected to the ocean by underground tunnels and is filled with lightly salted water. Representatives of this species differ from marine individuals also in that they completely lack age spots, there are no stinging tentacles, as well as tentacles that surround the mouth.

The golden jellyfish, although it belongs to the scyphomedusae, over the years has turned into a completely different species that does not pose a danger to humans, since it has significantly lost its stinging ability. An interesting fact is that the Golden Jellyfish began to grow green algae on its body, from which it receives part of its nutrition. The golden jellyfish, like its marine relatives, feeds on plankton and has not lost the ability to migrate - in the morning it swims to the east coast, in the evening it swims to the west.

box jellyfish

Box jellyfish have a more advanced nervous system compared to other members of the cnidarine class. They are the fastest of all jellyfish (capable of speeds up to 6 m/min.) and can easily change their direction of movement. They are also the most dangerous representatives of jellyfish for humans: the bites of some representatives of box jellyfish are fatal.

The most poisonous jellyfish in the world belongs to just this species, lives near the Australian coast and is called the Box Jellyfish or Sea Wasp: its poison can kill a person in just a few minutes. This wasp is almost transparent, of a pale blue hue, which is why it is hard to see on the water, which means it is easier to stumble upon it.

The sea wasp is the largest jellyfish in its class - its body is the size of a basketball. When the sea wasp is just swimming, its tentacles are reduced to 15 cm in length and are almost invisible. But when the animal hunts, they stretch up to three meters. Sea Wasps feed mainly on shrimp and small fish, and they themselves are caught and eaten by sea turtles - the only animals on our planet that are insensitive to the poison of one of the most dangerous creatures on Earth.

Many mysterious creatures live in the waters of the Black, Azov and Baltic Seas, one of which is the aurelia jellyfish, nicknamed eared because of the four blades located under a jelly-like dome and strikingly resembling hare ears. There is nothing surprising in the fact that today this weightless marine inhabitant is of interest to many aquarists.

Jellyfish are invertebrates

Lifestyle

The natural habitat of eared aurelia is the coastal waters of the seas of the temperate and tropical zones. The most numerous colonies of jellyfish can be found in the equatorial strips close to the coast, where they often form dense clusters of a rather large extent.

Aurelias are characterized by a pelagic way of life. In simple terms, they inhabit areas that are not in close proximity to the bottom. This marine inhabitant belongs to the eurybiont type of invertebrates., which means it is able to tolerate significant fluctuations in ambient temperatures and constant changes in the level of salt in the water, which explains its extremely wide distribution.

Without exception, all scyphoid jellyfish are poor swimmers. They only rise from the depth and sink again, motionlessly freezing for some time in the water column. After storms, the entire coastal zone is literally strewn with aurelia.

She is harmless to humans.

Until recently, this type of jellyfish was considered harmless to humans. However, in the Gulf of Mexico, there have been cases of people receiving severe burns in contact with eared aurelia. In the Black Sea for a bathing person such jellyfish is not a serious threat. Unless its stinging cells can provoke a slight irritation, comparable to what remains after contact with nettles.

Morphological features

Outwardly, the eared aurelia resembles a transparent umbrella. The jellyfish does not have a hard skeleton. The base of the body, which is 98% liquid, is represented by a jelly-like dome covered with epidermal cells. The size of a marine inhabitant sometimes reaches 50 cm.

Along the edges of the body there is a huge number of thin tentacles hanging down, dotted with stinging cells - the main weapon of the jellyfish, with which it paralyzes small animals. The continuous contraction of the muscle fibers of the dome ensures its movement and creates a current of water that directs plankton into the oral cavity.

There are several stages in the development of a jellyfish

Along the edges of the umbrella are complex sense organs - ropalia. With their help, the eared aurelia orients itself in space and keeps at some distance from the sea surface so that the raging waves do not damage its body.

In the central part of the lower side of the dome there is a mouth surrounded by two pairs of lobes. By their size, it is easy to determine the sex of a jellyfish. In the female, the blades are much larger - they contain chambers for the maturation of larvae. Through the mouth and pharynx, food enters the stomach, and then, due to the work of the flagellar epithelium, enters the radial canals. Undigested residues follow the same path in the opposite direction and are excreted.

Stages of development

The eared jellyfish is a dioecious intestinal animal that gives birth only once in a lifetime, after which it dies. An interesting fact is that aurelias show a kind of concern for their brood, which cannot be said about the rest of the representatives of scyphoid jellyfish. The life cycle of a marine animal consists of several stages:

1. A two-layered embryo that develops in an egg.
2. Larva (planula).
3. Polyp.
4. An adult.

Adult - the last stage

In a female hovering in the water, the oral lobes are lowered, so the eggs emerging from the mouth opening penetrate into special gutters, move along them and fall into pockets, where they are fertilized and further developed. Gradually, the embryo becomes covered with cilia that help it swim, and eventually transforms into a larva.

For some time, it stays in the water column, and then sinks to the bottom and is fixed on it with the help of the front end. A mouth with tentacles emerges from the upper body, and the larva turns into a polyp, visually resembling a hydra. At the next stage, its division occurs, which is provided by transverse constrictions that cut into the body. This is how young aurelias appear.

Breeding aurelia at home has its own nuances. Jellyfish need a special reservoir that provides a smooth circular flow in which they will not be afraid of collisions with objects encountered in their path. This is an extremely important point, since the delicate and soft body of the eared aurelia can easily be damaged even from a slight blow. Finally, you need to keep in mind that the aquarium must be spacious enough, otherwise the jellyfish will be deprived of the opportunity to fully straighten their body.

Jellyfish love algae

Jellyfish can be kept under conditions of minimal water filtration. To maintain its quality at the proper level, it is simply necessary to regularly change the contents of the aquarium. Jellyfish do not take root in water, which contains a lot of organic matter and nitrogenous compounds. Aurelias do not like it when other stinging animals (for example, hydras) are added to them.

In terms of food, these creatures are completely unpretentious. They are good for:

• phytoplankton;
• seaweed;
• finely chopped seafood.

However, in specialized stores there are always ready-made feeds designed specifically for such aquarium inhabitants. As practice shows, the Aurelia eared jellyfish feels good in captivity. Some aquarists not only successfully keep them, but also breed them, observing all stages of development.

In this video you will learn more about the jellyfish:

Which of the tourists vacationing in Anapa has not had to deal with cute jelly-like creatures that plow the expanses of the Black Sea. Weightless jellyfish are permanent inhabitants of the local waters. Sometimes our underwater neighbors can be seen nearby or touched on their slippery body while swimming. Today we will talk about the most famous jellyfish of Anapa, which is beautiful and romantic called Aurelia. Often our beauty is called an eared jellyfish, from our review the attentive reader will understand why.

Appearance

Outwardly, Aurelia looks like a floating transparent umbrella. The base of the body consists of a dome, the dimensions of which can reach up to 40 centimeters. If you look at the jellyfish from above, four horseshoes decorating the body are clearly visible. This is manifested by the sex glands, depending on the sex of the aurelia, these horseshoes acquire a different color and size. The stomach is located inside the fleshy umbrella, and on the lower part there is a rectangular mouth opening, next to which you can see oral lobes that look like small ears. Along the edges of the rounded body, nature has awarded the aurelia jellyfish with small but very important tentacles. The threads of the tentacle are equipped with stinging cells that can immobilize the smallest living creatures that the jellyfish feeds on. It turns out that Aurelia has eyes and organs of balance, which are located inside the dome.

habits

Aurelia chooses a pelagic way of life, i.e. likes to drift closer to the upper layers of the water element. Here, especially when the sea warms up, there is enough plankton and small larvae that make up the main diet of the eared jellyfish. Ears or mouth cavities are necessary to more conveniently rake, immobilized microscopic food. Stinging cells help make plankton more obedient. Also in the warm season, when there are already a lot of tourists on the beaches of Anapa, the mating season begins at Aurleia. The female carries eggs inside the dome; after fertilization, small larvae drift in the water. After some time, if the larvae do not end up in the stomachs of other jellyfish, they sink to the bottom and turn into a polyp. And already this polyp by budding produces young jelly-like animals.

Marine life researchers claim that Aurelia uses ultrasonic waves to hunt more successfully. By spreading the wave, it is easy to spot the accumulation of plankton and head there for a big feast. Sometimes in you can find whole clusters of such jellyfish. Human sensations when meeting with jellyfish, different people endure in different ways. Usually Aurelia leaves a small burn, which gradually passes. The pain from a collision with an eared jellyfish is not as dangerous as the injury that a cornetrot jellyfish can leave.

Jellyfish stung, what to do?

If your body has suffered from a jellyfish burn in Anapa, and you are afraid of the consequences, you must do the following. First, be sure to wash the burn site with sea or salt water, discard fresh water, it can activate the stinging cells that remain on the wound. Next, lubricate the injury site with antihistamine ointments.
The first time you are on, watch your children, it is very important that the jellyfish tentacles do not come into contact with the human mucosa. If your child complains of itching and burning of the eyes or mouth, it is advisable to contact the first-aid post.

Jellyfish are amazing and very extraordinary creatures. We read and watch

Jellyfish are amazing and very extraordinary creatures, causing a whole range of emotions from delight and admiration to disgust and fear. Jellyfish can be found in every sea, in every ocean, on the surface of the water or many kilometers deep.
Jellyfish are the oldest animals on the planet, their history goes back at least 650 million years. In nature, there are an incredible number of diverse species, but even at the present time, the emergence of new ones, previously unfamiliar to mankind, is being recorded.

Jellyfish washed up on the sand of Belmedie Beach, Scotland

In fact, jellyfish or medusa generation are one of the phases of the life cycle of the cnidarian Medusozoa, which are usually divided into three types: hydroid, scyphoid and box jellyfish. Jellyfish reproduce sexually. There are males that produce sperm and females that produce eggs. As a result of their merger, the so-called planula is formed - the larva of the jellyfish. Planula settles to the bottom, where over time it turns into a polyp (asexual generation of jellyfish). Reaching full maturity, the polyp begins to bud off the young generation of jellyfish, often not at all like adults. In scyphoid jellyfish, the newly separated specimen is called the ether.

The body of jellyfish is a jelly-like dome, which, through contractions, allows them to move in the water column. Tentacles, equipped with stinging cells (cnidocytes) with burning poison, are designed for hunting and capturing prey.

Jellyfish at Shark Bay Manaday Reef Aquarium in Las Vegas, Nevada

The term "jellyfish" was first used by Carl Linnaeus in 1752 as an allusion to the animals' resemblance to the head of the Gorgon Medusa. Popularized around 1796, the name has also been applied to other medusoid species, such as ctenophores.

Jellyfish on display at Long Beach in California

Did you know? 10 interesting facts about jellyfish:

The largest jellyfish in the world can reach 2.5 meters in diameter and have tentacles over 40 meters long.

Jellyfish are able to reproduce both sexually and by budding and fission.

Jellyfish "Australian wasp" is the most dangerous poisonous animal in the world's oceans. The venom of a sea wasp is enough to kill 60 people.

Even after the death of a jellyfish, its tentacles are able to sting for more than two weeks.

Jellyfish do not stop growing throughout their lives.

Large clusters of jellyfish are called "swarm" or "bloom".

Some types of jellyfish are eaten in East Asia, considering them a "delicacy".

Jellyfish do not have a brain, respiratory system, circulatory, nervous and excretory systems.

The rainy season significantly reduces the number of jellyfish that live in salt water.

Some female jellyfish can produce up to 45,000 larvae (planula) per day.

The most incredible and bizarre forms

Aequorea Victoria or jellyfish "crystal"

purple sting

Elegant dance of jellyfish

Aurelia - "butterflies"

Medusa - crown

Eared aurelia (lat. Aurelia aurita) - a species of scyphoid from the order discomedusa (Semaeostomeae)

glowing ctenophore

pink jellyfish

A pink jellyfish from the Scyphozoan family was discovered more recently, just over 10 years ago, in the waters of the Gulf of Mexico and the Caribbean. Some individuals of this species reach 70 cm in diameter. Pink jellyfish can inflict severe and painful burns, especially if the bather inadvertently finds himself among a large concentration of these creatures.

Antarctic Diplulmaris

The Antarctic Diplulmaris is a species of jellyfish in the Ulmaridae family. This jellyfish was discovered recently in Antarctica, in the waters of the continental shelf. The Antarctic Diplulmaris is only 4 cm in diameter.

Jellyfish colony

Aurelia eared (lat. Aurelia aurita) or moon jellyfish

Pacific sea nettle (Chrysaora fuscescens)

Flower Hat Jellyfish (Olindias formosa)

Jellyfish "flower hat" (lat. Olindias Formosa) - one of the types of hydroid jellyfish from the order Limnomedusae. Basically, these cute creatures live off the southern coast of Japan. A characteristic feature is the motionless hovering near the bottom in shallow water. The diameter of the "flower cap" usually does not exceed 7.5 cm. The tentacles of the jellyfish are located not only along the edge of the dome, but also over its entire surface, which is not at all typical for other species.
The flower cap burn is not fatal, but it is quite painful and can lead to severe allergic reactions.

Scyphoid jellyfish rhizostoma (Rhizostoma pulmo) or cornerot

Incredible bioluminescent jellyfish

Jellyfish - an inhabitant of the coast of the Federated States of Micronesia

Purple-striped jellyfish (Chrysaora colorata)

Purple-striped jellyfish (lat. Chrysaora Colorata) from the class Scyphozoa is found only off the coast of California. This rather large jellyfish reaches 70 cm in diameter, the length of the tentacles is about 5 meters. A characteristic feature is the striped pattern on the dome. In adults, it has a bright purple color, in young ones it is pink. Usually purple-striped jellyfish are kept singly or in small groups, unlike most jellyfish of other species, which often form huge colonies. Chrysaora colorata burn is quite painful, but not fatal to humans.

Pelagia Noctiluca, known in Europe under the name "purple sting"

Giant Nomura jellyfish (Nemopilema nomurai)

Giant Nomura jellyfish (lat. Nemopilema nomurai) is a species of scyphoid jellyfish from the Cornerot order. This species predominantly inhabits the East China and Yellow Seas. The size of this species is really impressive! They can reach 2 meters in diameter and weigh about 200 kg.
The name of the species was given in honor of Mr. Kan'ichi Nomura, the general manager of fisheries in Fukui Prefecture. In early 1921, Mr. Nomura first collected and studied a hitherto unknown species of jellyfish.

Currently, the number of Nomura jellyfish in the world is growing. Scientists consider climate change, overexploitation of water resources and environmental pollution as possible causes of population growth.
In 2009, a 10-ton fishing trawler capsized in Tokyo Bay with three crew members trying to pull nets overflowing with dozens of Nomura jellyfish.

Large red jellyfish (Tiburonia granrojo)