Recently, such articles have been circulating on the Internet...
Question: What is this? Why does it look like a plastic bag? Is it really jellyfish?
Fruit shell netizen Jowtte replied:
To be precise, the monk's hat jellyfish resembles an inflatable plastic bag, or an inflatable balloon. Well, because it's really inflatable.
【Built-in buoyancy device】
Physalia physalis belongs to the phylum Hydra, Hydra, and the order Pipe Jellyfish. The jellyfish we often eat are the phylum of stingrays, the bowl jellyfish, and the root-water mother. The echinococcosis phylum is a split from the previous intestinal phylum, which no longer exists.
[I'm not me, it's us]
Tube jellyfish are quite magical, although they are called jellyfish, but unlike most other jellyfish. From the outside, "one" complete tube jellyfish seems to be little different from other types of jellyfish (such as jellyfish), but in fact "one" tube jellyfish is a large family of loving relatives living together, and they are a highly specialized community. Individuals in the community belong to different types of hydra bodies, which are on the same piece of common flesh and multiply through budding reproduction, but not separated from the mother. They perform their respective duties, some responsible for protection, some responsible for predation, some responsible for digestion, some responsible for perception, some responsible for movement, and some responsible for reproduction. Therefore, these individuals cannot survive independently.
Tube jellyfish are divided into three suborders according to the different types of hydra bodies (mainly to see the presence or absence of floating cysts and swimming bell bodies). The monk's cap jellyfish belongs to the cystic suborder Cystonectae that does not have a swimming bell body. There is only one genus and two species in the family Jellyfish, P. physalis and P. utriculus. The latter is smaller and less toxic. By the way, the genus Mongyman jellyfish was named after Jean-Lamarck, who proposed the doctrine of "use in and out".
The monk's hat jellyfish is composed of four types of hydra bodies. Look at the picture:
At the very top of the entire community is the pneumatophore. The floating sac is a vesicle-shaped balloon that contains gas glands on the wall of the sac, which can secrete gas, so that the entire community can live a floating life. The floating capsule is the "balloon" in the picture. Usually, the floating sac is filled with gas and floats on the surface of the sea, somewhat resembling a "float". The floating capsule looks a bit like a monk's hat, with a raised peak in the middle that acts as a sail, increasing air resistance and using the wind at sea to drift. The color of the floating capsule is usually blue-purple, which is believed to weaken the damage of ultraviolet rays. When frightened, the floating capsule can release a part of the gas and sink rapidly. The gas composition in the floating sac is roughly similar to that of air, but contains a relatively high concentration of CO, and the literature records that the approximate concentration range is 8% to 13%.
The very short hydra underneath the floating cyst is a gonozooid, which has no mouth or tentacles, but is capable of producing reproductive cells (gonophore).
The longer hydra body is a gastrozooid. The vegetative body has a mouth, and there is also a tentacle that can be long or short, and can eat.
The longest hydra is a dactylozooid that is similar in shape to a vegetative body, but has no mouth. The finger body is usually about 10 m long, and it has been recorded that the longest can reach 30 m. There are a large number of spine cells on the finger, and there are toxins in the spine cells. After the finger-like body stabs and kills the target, it contracts and sends the prey to the vegetative body for digestion and absorption. The spiny cells are disposable and come off after use, but new spiny cells grow out in a very short time.
[Ah, life with the flow...]
Monk's hat jellyfish are tropical/subtropical species, because they can not swim on their own, so they can only go with the current, will drift away with the ocean current, is an indicator species of warm ocean currents.
Although the northernmost record of the discovery of the monk's hat jellyfish is very far north, it is almost impossible to find this thing in Dalian. In fact, I checked Du Niang and found the same pictures, the same descriptions occurred in many coastal cities in China...
4 this pot I don't carry!
Finally, "It's the most poisonous jellyfish in the world"? The box jellyfish cried and fainted in the toilet.
More than 10,000 people are stung by monk-hat jellyfish (including blue bottles) in Australia every year, but the probability of death is very low. Moreover, the deceased did not die mainly of poisoning, but died of drowning due to severe limb pain or respiratory edema after poisoning [1]. However, after being stung by a monk's hat jellyfish, it will cause severe pain, and may leave scars, and may feel that life is worse than death... [2]
The Australian tank jellyfish (Chironex fleckeri) is widely accepted as the "most poisonous jellyfish", and according to the literature, at least 63 people in Australia died from stings from this jellyfish between 1884 and 1996.[1]
[1] Fenner, Peter J.; Williamson, John A. (December 1996) ." Worldwide deaths and severe envenomation from jellyfish stings". Medical Journal of Australia 165 (11–12): 658–661. ISSN 0025-729X. PMID 8985452.
[2] Exton DR. Treatment of Physalia physalis envenomation. Med J Aust. 1988,149 (1): 54. PMID 2898725
Fruit shell netizen Enron_Lotus free Answer:
Upstairs, it's all comprehensive, but again: you can't see this thing in Dalian, unless the global ocean currents are retrograde...
The original Weibo posted this article, which means that I met it on the seashore in Miami. This should be the first time the picture was first published, and the museum asked him to seek medical treatment as soon as possible.
Who wants to be able to meet this thing on the seashore in Dalian, I will eat half a pound of old vinegar sting head on the spot to show you!
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Your naturalist said: Dalian? Slag...