Are spiders poisonous?

Most of them are nontoxic but poisonous spiders: spiders. At present, more than 35,000 species of * * * have been found in the world, including about 2,000 species in Chinese mainland and 269 species in 39 families 122 genera in Taiwan Province province. Araneae is the largest order in Arachnida. Araneae is the largest order in Arachnida. Araneae is a class of arthropods, with about 65,000 ~ 73,000 species. Araneae has eight legs, and most of them live on land. 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 eat by mouth. Spiders are oviparous, and most male spiders will be swallowed by female spiders after mating with them. Wandering spiders don't weave webs, but wander around or disguise themselves to hunt prey. General classification of Araneae: Araneae, Araneae, Araneae, Araneae, Araneae, Araneae, Araneae, Araneae, Arachnidae, jumping Araneae. Arachnidae, Arachnida, and Arachnidae, among which: Arachnida. Different from the common spiders, this spider has four bookworms, and the range of movement when touching the limbs is almost parallel (unlike the staggered form of people holding chopsticks when eating). It is easy to see from the photos that the application direction of touching limbs is from top to bottom, not diagonally. Therefore, the Latin scientific name of this suborder was Orthognathidae, which means "frontal forehead". This spider can make a tube about 30 cm long from silk, with one end underground and the other end hanging on a tree trunk or other vertical surface. Spiders hide inside, wait for their prey to climb outside, then grab it through the silk surface with their claws and pull it inside to eat. Bird-catching spiders belong to primitive spiders and are covered with fine hairs. Bird-catching spiders in South and North America may have an irritating short hair in some places. When you meet enemies such as mice, you will use your hind feet to sweep away this natural itchy powder. The reaction of enemy objects, such as workers laying woven glass mats, will itch all over. Because you can use this protection method, you may not bite as much as bird catchers in Asia and other places. The toxicity of American bird spider is often lower than that in Asia and other places. Yamia watasei Kishida 1928 is a kind of tarantula, which is only found in Lan Yu. It is often called a tarantula because it often catches up with its prey from behind. Good at running, but not good at climbing on smooth vertical surfaces such as glass. Its walking and climbing ability and vision are not as good as those of Muscidae (jumping spider). After laying eggs, the egg bag is carried under the silk bag (spinning machine). After the eggs hatch, all the little spiders climb to the abdomen of the mother spider and sit for a few days before they can live independently. Tarantulas have three rows of eyes. Its second column is monocular. Because of its way of hunting things, it is commonly known as the flying tiger, also known as the jumping spider. Flying tigers have good eyesight and are good at jumping. When diving approaches the prey, it gradually approaches first, and then pounces on the prey from a closer position. Because it is dangerous to fall from trees and other heights, put a silk on it before jumping, just like climbers use rock nails and ropes to prevent falling. The head and chest of the flying tiger spider are square compared with other families. There are eight eyes in the head and chest, two of which are usually bigger than the others. Araneidae is a family of spiders. It is very beautiful and remarkable. It often weaves a large wheel-shaped net more than half a meter in paths and similar places, and then hangs itself in the center waiting for the arrival of prey. When small animals walk on the ground, it is good for spiders if insects on the road escape and meet their nets, but if people or other larger animals destroy their nets when passing by, spiders may lose a lot and even be trampled to death. Therefore, some (such as spider webs) weave another zigzag or other obvious patterns in the center of the web. Then the half-black, half-white or half-black and half-yellow spider stretched out its feet on the white ribbon to make a big "X" shape, and made it clear to the taller passers-by: "Don't break through!" Many people will be surprised to see this spider, because it is generally obvious that insects are poisonous, but in fact this spider will try to avoid contact with any large animals. And its poison is not very dangerous to people, and its reaction is similar to bee venom. There are many kinds and sizes of spiders in this family, but they all have eight single eyes. The general form is as follows: the eyesight of spiders in this family is far less than that of Taraxaceae and Muscidae. And it is only enough to distinguish between black and white. So they rely on touch to identify prey and other important things in the environment. After falling into the net, the struggle of the prey is easy to destroy the net, so the spider immediately tries to wrap the prey with silk as quickly as possible, so that it can't move, then takes the opportunity to bite it and inject its venom, and then comes back to eat after it stops struggling. There are many kinds of arachnids, about 2500 species in the world. Body length varies from 2 mm to 60 mm. Leucauge venusta is a spider with a hollow circular web. Its warp length is horizontal or slightly inclined. Body length is about 9~ 13㎜ for females and 7~8㎜ for males. Like most spiders, people belonging to arachnida have eight monocular eyes. At present, it is divided into the following four genera: Leucauge sp. (unknown in Chinese) Meta sp. (Only a few caves exist) (unknown in Chinese) Neophila sp. Tetraodonta. Spider (theridion spider), (old name: Achacaranea spider). Body length is about 5~8㎜ for females and 2.2~5㎜ for males. I often make irregular nets in cowsheds and other places. The mother spider hangs plum-shaped eggs in the net. Spider venom is generally aimed at prey and has little effect on people. Generally speaking, acaroid spiders are not dangerous (including T. tepidariorum), but there are also black widow spiders (Latrodectus sp.). In healthy adults, the mortality rate is not high, but the smaller the weight, the greater the risk of black widow poisoning.