Among them, the post-spinning suborder is divided into A: Protospider suborder (about 14 family, 1500 species); B: New Araneae (about 93 families, more than 38,000 species).
Spiders are natural enemies of many agricultural and forestry pests and play an important role in biological control. Protecting and utilizing spiders has become an important part of biological control. Spiders can be used as medicine to treat diseases such as proctoptosis, sores and bromhidrosis. The venom of a few spiders, such as the black widow, is harmful to people and animals. Burrowing tarantulas of the Tarantula family are distributed in Europe and Asia, and are also common in Xinjiang, China, and their poison can kill people and animals. Some spider toxins contain hemolytic enzymes, which can cause local necrosis and ulceration of wound tissue and spread around.
There are many kinds of spiders. There are nearly 40,000 kinds of spiders in nature. These spiders can be roughly divided into three types: safari spiders, cobwebs spiders and cave spiders. The first kind will forage everywhere, and the second kind will wait for rabbits after weaving a net. Most people keep the third kind as pets: cave spiders. They like to hide in sand or holes and make a net at the hole. The net itself is not sticky, and it is purely used to sense the size of prey and hunt. Spiders are the most common animals. There are about 40,000 kinds of spiders in the world, which are distributed everywhere except Antarctica. Some of them are ugly, some stumble, and some can walk and jump, which is strange.
The smallest spider in the world is a small spider that lives in the tropical forest of Panama. It is only 0.8 mm long and may be the smallest spider in the world.
Of all the animals, the weirdest name is a blind spider that lives in some caves in Kauai, Hawaii. This is an eyeless spider. It turns out that it belongs to arachnida according to various characteristics, but it is blind because it lives in caves, leaving the false name of "big eyes".
Spider that feeds on its mother, Red Claw Spider, is a mother-eating spider. The young spider of the red claw spider attached to the female spider and bit the female spider. The female spider also let it bite quietly. After a night, the female spider was killed by the young spider.
Australia has one of the largest spiders in the world. The big one weighs about half a catty and has eight legs. It is ugly, but it is a good hand at catching mosquitoes. Any mosquito that dares to pounce has the ability of a hunter. At the same time, the hunter's discovery contains a lot of protein, which is an excellent delicacy for the aborigines.
Bird-eating spiders There is a kind of Okumo in South America. The biggest spider is as big as a duck egg, and its silk is thick and strong. It weaves webs in the Woods and often uses it to catch birds.
Flying Spider There is a strange "flying spider" in Colombia. Instead of dragnet hunting, it rolls silk into a ball. As soon as there is a moth, throw the viscose ball at it accurately, hit the moth and pull it over, which becomes delicious. At the same time, it can also release a moth sex pheromone to attract moths.
The world's most poisonous spider Australia has a black spider that lives in bushes or grass. It has a poison sac, which contains highly toxic venom. People, animals or poultry are bitten by it, and they are in danger of losing their lives within a few minutes.
Haswell, the owner of a department store in London, guards the store for him with two poisonous spiders every night. It's also wonderful to say that the poisonous spider closed the door and the thief escaped. For several years, nothing has ever been lost in the shop. It turns out that this poisonous spider has two deadly toxins. Once stabbed, the pain is unbearable and will not heal for a long time. The worst will die.
Spiders that collude with plants to eat people in some forests or swamps in the Amazon basin of the United States, there is a kind of hairy spider that lives in groups. This kind of spider likes to live near sunflowers. It turns out that this flower is big and beautiful, and it can attract some people who don't know the truth to it. Whether people touch its flowers or leaves, it quickly rolls the branches and leaves around and entangles people. At this time, it sends a signal to the hairy spider, and groups of hairy spiders come to eat people. The remaining bones and meat rot and become fertilizer for sunflower.
Spiders weave fishing nets In Papua New Guinea, the fishing nets people use to fish are made of spiders. People just weave the base of the fishing net, then hang the "semi-finished product" between two trees, and then the spider completes most of the work of weaving the net.
Meteor hammer spiders live in Xishuangbanna, China. It lurks during the day and comes out at night. It spits out a spider silk with a sticky silk ball at the end. Moreover, it will emit a sex hormone smell similar to that of a certain female moth, attracting the male moth. When the male moth is lured into its attack range, it will hit the moth with a "meteor hammer". As long as the moth is hit, it will be immediately stuck by extremely sticky spider silk and become a delicious meal for spiders. According to the way of life and predation, it can be roughly divided into web spiders and wandering spiders.
The main feature of a web-forming spider is its web-forming behavior. Spiders secrete mucus through the protrusions at the top of their silk sacs, which can condense into very thin silk when exposed to air. The web made of silk is very sticky, which is the main predation means of spiders. For insects that stick to the web, spiders will first inject their prey with a special liquid jujube digestive enzyme. This digestive enzyme can make insects coma, twitch and even die, and liquefy their bodies. After liquefaction, spiders feed by sucking. Spiders are oviparous, and most male spiders will be swallowed up by female spiders after mating with them and become food for female spiders.
Wandering spiders don't weave webs, but wander around or pretend to hunt prey on the spot, such as tall-legged spiders, commonly known as "worms" in Taiwan Province Province.
Some spiders can make balloons out of nets and float to other places with the wind.
Spiders are not food on the human table. They don't even dare to stay away. Lu Xun said: "The first person to eat crabs is admirable. Who dares to eat if he is not a warrior? " Some people eat crabs, and some people must have eaten spiders. But if it is not delicious, future generations will not eat it "("The Second Feeling of Spring "). But recently, some areas, such as Sukhumi in Cambodia, have sold spiders as their dishes.
Spiders mainly prey on small insects. The tarantula beside the water can prey on small fish and shrimp, the bird spider can catch birds (it is said, but there is no exact literature record), and a 7.5 cm long spider in South America can even prey on small rattlesnakes. Web spiders prey on their webs.
(a) the corpse solution:
When spiders hunt, they first paralyze their prey with venom from fangs, secrete digestive juice and inject it into their prey to dissolve it, then suck it slowly and eat it completely.
(2) homemade fresh-keeping bag:
Spiders are afraid of light and often make webs where there is light and wind. Spider silk can be used not only to trap prey, but also as a fresh-keeping bag. The spider wrapped the leftover food in a net for the next time.
(3) Cleanliness:
Spiders clearly divide the places where they eat, sleep and pull things. Domestic spiders generally use cages as garbage stations, urinate in them and throw food scraps.
(4) Very subtle appetite:
Spiders have a strong sense of territory and should be kept separately. They only eat one or two meals a month and can fast for two months at most. The food is mainly insects, such as crickets and Cao Meng. As long as you put a wet sponge in the cage to replenish water, you can raise it to adulthood (about seven years) without changing the cage.
Not all spiders are poisonous (among them, arachnids are not poisonous)! And the toxicity is different. Usually, the toxicity of pet spiders in the market is relatively weak, and they will not take the initiative to attack people as long as they are not intentionally teased. Even if you are bitten, there is no danger to your life. Strong adaptability, no need for careful care. Spiders are the easiest pets to keep.
Spider silk is expected to be used to make high-strength materials, and experts from the Institute of Gene Biology of the Russian Academy of Sciences are actively studying the use of spider silk to make high-strength materials. There is a cluster of spinnerets behind the spider's abdomen, which passes through the silk glands in the body. Protein mucus secreted by this gland can condense into extremely strong spider silk in the air. According to the Moscow Communist Youth League newspaper, experts from the Institute of Gene Biology of the Russian Academy of Sciences found that the hardness of this material is 9 times higher than that of steel with the same thickness, and the elasticity is 2 times higher than that of other most elastic synthetic materials. Experts believe that after further processing, the above spider silk materials can be used to manufacture light body armor, parachutes, protective materials for weapons and equipment, wheel tires, plastic surgery appliances and high-strength fishing nets.