What is a water spider? Why can t spiders generally touch water?

There are usually two organisms called "water spiders" – water spiders of the family Hydroaradae, water spiders of the genus Hydroara, and water striders of the family Hydroaraidae, the genus Terra.

Water spiders, also known as silver spiders, live in water. When they dive into the water, the waterproof fluff that grows all over their bodies will attach many bubbles, as if they have entered a closed casing with a layer of air. This peculiar air shield makes the water spider a ball of mercury, which shines brightly, hence the name.

Good at spun silk between aquatic plants. Because of the storage of bubbles under the web, the original webs are in the shape of a bell, like a small caisson, and they are encamped in the caissons, in which the female lays eggs and hatches. The bubble swarm of the spider is not only an oxygen reservoir, but also an oxygen generator – constantly drawing oxygen from the surrounding water.

This is what people call the "physical lungs" oxygen delivery device. The oxygen concentration in the bubble gradually decreases during respiration, and once the oxygen content is below 16%, the oxygen dissolved in the water will replenish itself into the bubble. Usually when the spider is at rest, the physical lungs are sufficient to ensure oxygen supply; When the oxygen consumption is too high, the supply of oxygen-containing bubbles in the water will exceed the demand, and the proportion of other gases in the bubbles will rise until it greatly exceeds the proportion in the air.

As a result, the nitrogen begins to diffuse into the water, and the volume of the bubbles decreases accordingly (as the oxygen is depleted), and eventually, the spider has to reappear on the water and re-oxygenate the oxygen reservoir.

Water spiders feed on small fish, tadpoles, insect larvae, and small animals like leeches in the water.

Water strider is a small aquatic insect commonly found in lakes, ponds, paddy fields, and wetlands. Adults of the family Water Strider are 8 to 20 mm long, black-brown, and have a triangular head that is slightly longer. The body is small to large, oblong or oval.

The muzzle is slightly longer, divided into 3 segments, with the 2nd segment being the longest; The antennae are filamentous, 4-segmented, protruding from the front of the head. Prothorax elongated, dorsal mostly dark and dull, without distinct spots, forewings leathery, without membranous stem. The ventral surface of the body is covered with a layer of extremely fine silvery-white short hairs, which are silvery-white velvety in appearance and have a water-repellent effect.

Its trunk is similar to that of the family Broad Bruteidae. Their torsos are very elongated and covered with extremely fine hairs that are water-resistant. The abdomen has a pronounced lateral border.

Mulberry lives on the surface of the water almost all its life, and with the help of adaptive traits such as water-repellent hairs and outstretched limbs under the body, it will not sink or get wet with water. Paddle on the surface of the water mainly relies on the movement of the middle and hind feet, and the forefoot is raised when moving, not used to row, and is mainly used to catch prey. Bugs feed on other insects, insect carcasses, or other animal debris that fall on the water.

Habitats include still water surfaces such as lakes and ponds, as well as flowing water surfaces such as streams.

The phenomenon of some insects walking on the surface of the water has long puzzled scientists, and on August 7, the cover article published in the latest issue of the journal Nature pointed out that scientists in the United States have figured out how insects such as water fleas walk on the water. It was Professor John Bush of the Massachusetts Institute of Technology and his colleagues who uncovered the secret.

Fish and amphibians are able to live in water due to their unique body structure. Amphibians have a relatively long apnea holding time and can only live in the water for a short period of time, while fish have gills and fish bubbles (gills are responsible for breathing, fish bubbles are responsible for lifting and balancing), and some insects such as water fleas, which have neither gills nor fish bubbles, but can walk on the surface of the water, what is the reason for this? Previous researchers thought that this was mainly due to the surface tension of the ripples generated by the water meter.

The research team led by Professor John Bush used cutting-edge tracking devices and high-speed** cameras to capture the process of different insects walking on the water, thus revealing the secrets of insects walking on the water.

Experiments have shown that insects that can walk on the surface of the water do not rely on the surface tension of the ripples on the surface of the water, but use their hairy feet to create spiral-shaped whirlpools in the water, and with the help of the vortex's propulsion, they can move forward at a speed of more than 60 inches per second. The motivation for insects to walk on the surface of the water mainly comes from the whirlpools that form under the surface of the water. This is true of hundreds of different species, ranging in size from 1 cm to 20 cm, but all of them can walk on the surface of water. ▲

Only some spiders are water-afraid, and the surface of the spider's body is covered with dense fine hairs instead of oil, and the size of the spider varies from 3 mm to 9 cm. In the animal kingdom it belongs to the phylum Arthropods.

Arachnids. There are many species of spiders, and there are more than 35,000 species of spiders in nature. These spiders can be broadly divided into three types: hunting spiders, web-building spiders and cave spiders.

The first group will forage for food, and the second group will set up nets and wait for the rabbits. And most of the people who keep them as pets are in the third category: cave spiders.

They like to hide in sand piles or burrows, and build nets at the mouth of the holes, which are not sticky and are purely used to sense the size of their prey and prey on them. But there are also aquatic spiders, which live underwater by weaving webs to form air pockets.

Another point is that most house spiders cannot survive in the water, and the spiders you see should be the common tarantulas in the home. Finish.

Spiders are not insects and belong to arthropods. Spiders are generally considered to be insects, but they are not insects, just like scorpions and centipedes. Because the basic characteristics of insects are three parts of the body, head, thorax, abdomen, two pairs of wings and six legs.

Spiders feed on insects, other spiders, myriapods, and some spiders also feed on small animals. Jumping spiders have good eyesight and can dive within 30 centimeters to catch their prey and pounce on them. Crab spiders wait for their prey on flowers that are similar to their body color.

Spiders burrowing in the earth build burrows lined with silk, and the entrance of the burrow has a trap that opens at night to prey on insects that pass through the hole. funnel spiders weave funnel webs, and insects fall into the nets to cause vibration; The spider itself resides in a filament tube with a narrow end that leads into a plant or a crevice in a rock.

The reason why the water spider can walk on water has a lot to do with its body structure, the water spider is covered with a lot of fine fluff all over the body, which can play a role in waterproofing. And there are some small blisters on the surface of these appearances, and the feet of the water spiders are very slender, so the surface area is very large when they are on the water, and the tension of the water is also very large, so the water spiders can float on the surface of the water as a whole.

The structure of the water spider is actually the main reason why the water spider can be on the water is its fluff, the fluff of the water spider is very developed, and the fluff itself is waterproof, there are many small bubbles that can isolate the water spider from the water, so although the water spider acts on the water surface, it itself is equivalent to being isolated from the water surface, so the water spider can run rampant on the water surface.

And the water spider can also spin silk on some aquatic plants, such as on some aquatic plants and seaweed, you can spin silk webs, and then rely on spider webs to collect some small bubbles, then the spider web has become a large balloon, you can protect the water spider, the water spider can lay eggs on it, and these small bubbles can also supply oxygen to the water spider.

The habits of water spiders These small blisters are very important for water spiders, because the oxygen supply of water spiders depends on small blisters, and when water spiders breathe, the oxygen content of these small blisters will decrease, and when the oxygen amount is too low, the oxygen in these bubbles will be automatically replenished, so even if the water spiders remain stationary, there is no need to worry about suffocation due to lack of oxygen, because these bubbles will constantly replenish oxygen.

However, if the oxygen is insufficient, the water spider will come to the surface, so the water spider cannot survive under the water surface for a long time, and often has to surface to breathe. The way water spiders breathe gave scientists some inspiration to create physical lungs that divers need to carry if they want to dive to the bottom of the sea.

Because the body structure of the water spider is abnormal. He has a kind of fluff all over his body. In addition, there is tension on the surface of the water, so it can walk on water.

Because water spiders have a lot of hair on their feet and are water-repellent, they can walk on water.

Water has surface tension, and the water spider is covered with waterproof fluff all over the body, and many bubbles are attached, which can increase the surface area of rainwater, resulting in a great tension of water, so that you can walk on the water instead of floating on the water.

Because of the spider's small size and the small contact area of its feet, spiders can easily walk on water.

It is not spiders that walk on the surface of the water, this creature is called water strider, also known as water horse insect, which is an aquatic hemipteran insect, Hemiptera, water strider. Water striders live on the surface of the water all their lives, and with the help of adaptive traits such as water-repellent hairs and outstretched limbs under the body, they do not sink or get wet. On the water.

Paddle mainly relies on the movement of the middle and hind feet, and the forefoot is raised when moving, not to paddle, and is mainly used to catch prey.

The real water spider, also known as the silver spider, can dive into the water, but not walk on the surface of the water, when the water spider dives into the water, the whole body is covered with waterproof fluff will attach many bubbles, as if entering a closed sleeve of air layer.

Their body is covered with hairs, which increase the surface area between their body and the surface of the water.

The scientific name of Zamon flower is allium tenuissimum LSynonyms: wild mountain onion, wild onion, wild leek, Zamon flower, twist flower, thief twist flower, etc., is a perennial herbaceous plant of the family Liliaceae.

It is widely distributed in Hebei, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Shandong, Shanxi, Gansu, Qinghai, Sichuan, Shaanxi, Ningxia, Henan, Jiangsu and Zhejiang on slopes, grasslands or sand dunes below 2000 meters above sea level. Its flowers contain 11 kinds of natural aromatic substances, and are the best seasoning for the masses in the northern region to boil pots, stir-fried vegetables, hot pots, pasta, and cold dishes. In the eyes of the people of northern Shaanxi, it is a pure natural wild delicacy, the Zameng flower is dried, put into the hot oil pan and fried, and sprinkled with a handful of fine salt when it comes out of the pot, which becomes an indispensable high-quality seasoning on the dining table of people in northern Shaanxi.

Extended Materials. Mountain onion flower is rich in nutrition, fragrant and attractive, palatability is good, is an excellent pasture, but also a detoxification plant, when livestock mistakenly eat poisonous grasses such as drunken horse beans, herdsmen often feed allium plants such as fine-leaved leeks to detoxify.

The shallots are fibrous root system, and the root system is developed, drought tolerant, cold tolerant, barren resistance, strong growth ability, whether in the barren and cold Mu Us sand area, the barren banks of the Yellow River, or the arid Baiyu mountain area can grow well, is a good windbreak and sand fixation, soil and water conservation plants; At the same time, the flower color of the green onion is white or light purple, and the flowering period is long, which is a good ornamental plant.

The flower fragrance of mountain onion is specific, suitable for seasoning, the effect is better than that of green onion and garlic, especially after frying, it presents a special and rich fragrance, and is the hobby of the people of northern Shaanxi to eat condiments; Fine mountain green onion can also be used as a vegetable, pick young leaves in spring and summer, can be used as stuffing, stir-frying, cold dressing, delicious, often eaten and also have the effect of tonifying the kidney and aphrodisiac.

Naming conventions for botanical names:

The botanical name refers to the binomial method of plants advocated by the Swedish botanist Linnaeus in 1753. As an internationally consistent plant nomenclature. The names of plants are very complex, not only different from different languages in different countries, but also different regions within a country, and often inconsistent, so the phenomenon of the same name or the same thing is very common, which is extremely unfavorable to the popularization of science and the exchange of experience.

In order to unify the nomenclature of plants, scientific nomenclature (abbreviated as scientific names) has been adopted internationally. The binomial law stipulates that the name of each plant consists of two Latin characters, the first being the "genus name" to which a plant belongs, and the second being a "species additive", which plays the role of marking a certain plant species. The combination of these two words is the species name or Latin scientific name of the plant.

The name of the person who named the name must usually be attached to the scientific name to indicate responsibility and facilitate examination.

Spiders are not insects, they are spiders of the order Spider spiders, and there are currently more than 35,000 species found in the world, of which there are about 2,000 species in Chinese mainland and about 269 species in 122 genera and 39 families in Taiwan. Arachnids are the most abundant order in the order Arachnida. In terms of life and predation methods, it can be roughly divided into:

Web-forming spiders and wandering spiders. The most important characteristic of a web-forming spider is its web-building behavior. Spiders secrete mucus through protrusions at the tips of silk sacs, which can congagulate into very thin filaments when exposed to air.

Webs made of silk are highly sticky and are the main means of predation for spiders. For insects that stick to the net, spiders will first inject a special liquid jujube digestive enzyme into the prey. This digestive enzyme can cause insects to stun, convuls, and die, and liquefy their bodies, which can be liquefied by the spider in the mouth.

Spiders are oviparous, and most male spiders are devoured by female spiders after mating with female spiders. Wandering spiders do not build webs, but instead roam around or camouflage in place to hunt prey. Some spiders can make a balloon out of a web and float it to other places with the wind.