What is the smallest jellyfish in the world and what is the largest jellyfish in the world?

The smallest jellyfish in the world is: the Irukanji jellyfish.

The smallest jellyfish in the world is found on the Great Barrier Reef in Australia.

The Irukanji jellyfish in the water, its umbrella is only about a centimeter in diameter, and the umbrella is a cube.

type, a total of four sides, each side of the edge has a hollow tentacle, this jellyfish tentacle is very strong in the ability to contract, in the tightening of generally only 5, 6 cm.

The Irukanji jellyfish is transparent and difficult to see with the naked eye. Its umbrella is cube-shaped, has four sides, each with a pair of eyes, and in addition to the tentacles with stinging cells, they also have many spiny cells on their covers. According to research, the Irukanji jellyfish is one of the few jellyfish that also has stinging cells on the umbrella cover.

And the largest jellyfish in the world is the Echizen jellyfish, which can reach up to 3 meters in diameter with its canopy.

Notes:

Note that there is currently no antidote to this jellyfish toxin, not even a tranquilizer like morphine.

Nor can it stop the pain, and the terrible pain can last up to a week.

Also known as the most venomous jellyfish in the world, the Irukanji jellyfish is only a few centimeters tiny, but its body is hundreds of times more poisonous than that of a cobra.

These jellyfish are so small that they are barely visible to the naked eye in the water, and they will even burrow into the protective nets of the swimming area through the mesh, so as to avoid being harmed by the waters frequented by the Irukanji jellyfish.

The Irukanji jellyfish is the smallest species of upper jellyfish in the world. Its canopy is only a few centimeters in diameter, not as large as our human fingernails, and it is mainly found in the waters of Australia's Great Barrier Reef.

Characteristics of the Irukanji jellyfishThe entire body is transparent, and it is generally difficult to see them with the naked eye. Their wing is a cube with four sides. Each side has a pair of eyes and a very long tentacle, and the tentacles are very flexible, reaching up to 1 meter when stretched, and 5 to 6 centimeters long when not extended.

In addition to the tentacles, there are also clusters of stinging cells on its canopy.

There are two living species of Irukanji jellyfish that have been found so far, they are very tiny, no larger than a human fingernail, and their whole body is transparent, making it difficult to see with the naked eye. They are cube-shaped and have four sides, each with a set of eyes. In addition to clusters of stinging cells on their tentacles, Irukanji jellyfish also have stinging cells on their canopies.

Arctic jellyfish.

The Arctic jellyfish, also known as the lion's mane jellyfish (scientific name cyaneacapillata), is a member of the family of Cyanea jellyfish and the largest jellyfish in the world, with an umbrella-shaped body of up to two meters, eight groups of tentacles, up to 150 tentacles, and can grow more than 36 meters long.

Also known as the lion's mane jellyfish, the Arctic jellyfish is a member of the family of Jellyfish and the largest jellyfish in the world. The family is a family of the order Aeaeaedae, containing 3 genera and 22 species. It is mainly found in the western Atlantic.

Its umbrella-shaped body can reach up to two meters, with eight sets of tentacles, up to 150, and can be more than 36 meters long. The longest can even stretch more than 40 meters per tentacle, and can shrink to only one-tenth of its original length in a second. It mainly grows in colder seas, including the Arctic Sea, the North Atlantic Ocean, the North Pacific Ocean and other seas, and rarely grows in areas below 42 degrees north latitude.

There are similar species of jellyfish in the waters of Australia and New Zealand.

Russian diver and photographer Alexander Semenov risked his life to dive several meters underwater, giving us a chance to catch a glimpse of the fantastic lion's mane jellyfish. Semenov, who is also a marine biologist, worked hard for more than 2 years in the harsh environment of the extremely remote "White Sea Biological Station". This scientific research station is located on the western coast of Russia, and whenever he stops to rest from work, he dives underwater to photograph the ** of these beautiful creatures that live in the depths of the ocean.

Of course, sometimes he is also in danger. The underwater photographer breaks the Arctic sea ice into icy waters of -2 degrees Celsius. Temperatures above sea ice are even lower, reaching -30 degrees Celsius.

Located in the northeastern Atlantic, it's twice the size of Denmark, but has only recently been explored by divers. The water here is completely transparent, allowing divers to see at depths of up to 40 meters, so they are of great interest.

Semenov has documented the striking differences between these jellyfish species. They have evolved to no longer have any relationship with jellyfish in warmer waters elsewhere in the world. The "cap" of a lion's mane jellyfish can reach up to 3 meters in diameter, and its tentacles can grow up to 30 meters.

The picture shows a lion's mane jellyfish swimming to the surface. This jellyfish is usually left at a depth of 20 meters. In July 2010, 150 people were stung by a jellyfish at Wallis Sands State Park in New Hampshire, USA, and the prevailing belief was that it was a jellyfish wreck that disintegrated in the water, only to sting unsuspecting swimmers at the same time.

Lion's mane jellyfish have poisonous stingers on their bodies, but they usually only cause swelling pain, not fatality.

The larger the lion's mane jellyfish grows, the deeper the purple color of its body, while the tentacles turn red. As it grows older, it even begins to eat other smaller jellyfish. They grow in the summer and die in the winter, perhaps due to a lack of food in the water in the winter or worsening marine conditions.

But for most of their lives, lion's mane jellyfish float freely in the sea, gently pulsing in search of seaweed and plankton.