China Naming Network - Eight-character Q&A - Is the Okumo on the wall poisonous? (common, common)

Is the Okumo on the wall poisonous? (common, common)

slightly toxic.

introduction to spiders

the generic term for all species of Arachnida (Arachnida) and Araneae (Araneida or Araneae). It is distributed all over the world except Antarctica. From sea level to 5, meters above sea level, they are all terrestrial. The body length is 1 ~ 9 mm, and the body is divided into two parts: chest (front body) and abdomen (back body). The head and chest are covered with carapace and chest plate. There are two pairs of appendages in the head and chest. The first pair is a pincer with a pincer tooth and a poisonous gland opening at the tip of the pincer tooth. The pincers in the suborder of straight palate move back and forth, and the pincers move laterally and oppositely; The second pair is whisker limbs, which are in the form of feet in female spiders and immature male spiders, and are used to hold food and serve as sensory organs; However, in the male adult spider, the terminal segment of the whisker limb swells and becomes a connector for transmitting * * *. Spiders mostly feed on insects, other spiders and polypods, and some spiders also feed on small animals. Jumping spiders have good eyesight and can dive close to catch prey within 3 cm.

2. Morphological characteristics

Spiders vary in length from .5mm to 6mm. The body is divided into chest and abdomen. Some species have breastplates on the back of the head and chest (some don't), and there are usually 8 at the front of the head and chest? Monocular (there are also 6, 4, 2 and ), arranged in 2 ~ 4 rows. There is a large chest plate on the ventral surface, and there is a lower lip between the two frontal lobes in front of the chest plate. The abdomen is not segmented, and the abdominal stalk evolved from the first abdominal segment (the seventh body segment). The abdomen is mostly round or oval, and some have various protrusions with strange shapes. Abdominal ventral spinners evolved from appendages, and there are 8 primitive species, which are located slightly in the front; Most kinds of six? The spinner is located in front of the back end of the body; Some species have four spinners, and there are many spinning tubes on the spinners, which are connected with various silk glands, and the silk is spun from the spinning tubes. Sensory organs include eyes, various sensory hairs, auditory hairs, lyres and tarsals.

3. Internal structure

Spiders have a special internal structure, which is the book lung of the respiratory organ. The inside of the book lung is a sac, and the wall of each sac protrudes inward with many leaf-like folds, just like a page. Spider venom gland is cylindrical, and the gland wall is composed of a layer of cells. There is a catheter in front of the venom gland, which opens near the front end of the claw. The venom gland secretes venom, which has lethal effect on small animals, and some can also be life-threatening. For example, if it is bitten by a red spider or a cave tarantula, it must be treated in time to avoid life-threatening. A composition describing the appearance of spiders

When it comes to spiders, an ugly image will probably come to everyone's mind: eight bent and segmented legs, a spherical abdomen, and a pair of jaws with more or less toxins ... This image often makes people who don't know much about spiders think it is a pest.

however, is this really the case? I have observed spiders for a period of time and found that most spiders are not pests, but they are very beneficial to human beings! They caught a large number of pests in their own unique way.

as far as I know, there are two ways to catch insects: the first way is to "wait for the rabbit".

It first weaves a sticky gossip-shaped net with silk in its belly, and then hides in a corner that is not easy to be found, waiting for the arrival of flying insects. If any unlucky flying insect hits the net, its body will be stuck and unable to move.

At this time, the spider will crawl over quickly, bite the prey and inject "anesthetic" into its body, so that the internal organs of the prey will turn into liquid.

and finally? Dinner, of course! I have only seen the second method of catching insects once, and I don't know much about it.

This method of catching insects is relatively simple, and there are not many prey caught: it will pounce on prey like a wild animal.

at the speed of spiders, it's ok to catch some reptiles that can't fly, but what about those flying insects? It will greatly reduce the discount! In addition, spiders are also excellent weathermen.

On a clear day, it lazily basks in the sun on a horizontal net in Zhang greatly. Of course, if it can stick to an insect, it will be an unexpected gain for the spider.

In rainy days, spiders will leave the horizontal web and weave a vertical web in another shelter.

when you come back after the rain clears, you will find that the horizontal net has been beaten to pieces by raindrops, but the vertical net is intact.

According to this phenomenon, we can know that it will be a sunny day when spiders make horizontal webs. When spiders spin vertical webs, the weather is about to turn rainy.

after this introduction, you should know something about spiders! In fact, my observation is only one-sided, and there are pests in spiders.

want to know? Then please use your brains and observe more. If anyone knows more about spiders, you are welcome to communicate with me to enrich our knowledge. Observing Spider Composition < P > Today, I observed spiders carefully.

Today, when I came home from school, I saw something dark on the osmanthus tree. When I looked intently, it turned out to be a spider with a big belly and a thin waist. It was spinning a web! The rain just now destroyed the spider's web.

it's rushing to fix it.

what a big spider! About the size of a 2-cent coin, with a dark brown skin.

Eight paws are hugging a round belly, and it is hanging in the air. When you look closely, it turns out that there is a silvery white silk hanging in the air. The top of the silk sticks to a branch, and the bottom is followed by the spider's tail. As the eight paws keep paddling, the silk is constantly elongated.

the spider fell to the stake below to fix the filament.

follow the trunk and quickly return to the original high branch.

if he jumps, he will not fall.

at this moment, a bird swooped down and broke the net at once, taking away a large piece of net silk.

Okumo looked at the broken mesh regretfully and darned it calmly again.

it seems to knit faster this time! Although the spider is small, its indomitable spirit is worth learning. Imaginary composition about spiders (revelation from nature)

Today, I was playing ball in my yard.

Clapping, suddenly, I saw a net with a Okumo on it.

This Okumo is a bit scary-it's the size of a walnut, and its legs are three centimeters long, which is even longer than its body.

I see this spider seems to be sleeping, but when I look closely, it is moving and not sleeping.

after a while, it began to walk around on its own internet, as if it were taking a walk.

I thought it was very interesting, so I caught an ant and threw it on its net.

I saw this Okumo, like a bullet, running to the ant's side in a second.

This Okumo put her head to the ant and bit it in half. Then, this Okumo swallowed its food bit by bit.

After eating the delicious meal, it stayed on the Internet and waited motionless.

suddenly, another fly flew to its web.

But this time, Okumo didn't eat this fly like he ate ants last time.

It seems that its hands are like magic, circling around the fly. After a while, the fly becomes a white ball.

Finally, Okumo slowly pulled the fly back to its nest.

I took another tiny bug and threw it into the spider's web.

Compared with Okumo, that bug is like a grape and a watermelon. I saw the watermelon open its mouth and swallowed the grape in one gulp.

I went back to my room and leafed through the encyclopedia, and found that this spider is called a circular spider. This spider should be male, because the book says that it is about 2 mm long and its web will be round at dusk, so it is called a circular spider. Spider composition

Spider December 28th, 24 Ryan Daily I have never liked spiders.

The black body, thin and long legs are out of proportion to the body, and a pair of thieves' bright eyes stand out, which makes people sick.

What I hate more is spider silk-spiders always weave their webs in every corner of the room. I heard that spider silk is poisonous, so I once walked carelessly and let it fly into my eyes, but I couldn't find it, and I couldn't blow it out with air, which made my eyes red with pain.

So wherever I find spiders, I will step on them mercilessly, take off my shoes and pat them until they are wiped out.

However, there was a special experience that made me realize that spiders also have their lovely side.

It was in summer. I was doing my homework on the desk in front of the window, and I was depressed because I couldn't solve a difficult problem for a while.

at this moment, a heavy rain suddenly came, and the raindrops as big as beans slammed on the window glass, and the rain flowed down the glass.

The air in the room was so dull that I stopped my pen and looked out through the glass window.

Just under the eaves not far from the window, a spider was weaving a web, and the strong wind tore a big hole in the web. Seeing that the spider's hard work was in vain.

I think it's time for this annoying little animal to retreat and find a place to take shelter from the rain.

Unexpectedly, the spider is still struggling to mend the web.

It kicked its legs hard, wiped off the rain on its body, re-drew the gaps broken by the wind one by one, and a decent net opened again.

The strong wind blew again, and the newly woven net broke again, this time even worse.

I snickered, thinking that it would give up this net and turn away after suffering.

however, after it straightened up, it began to mend again, persevering and still struggling for its goal.

The scene in front of me reminds me of a touching story.

In the early 19th century, an English general was defeated on the battlefield and fled, hiding in the haystack of a farmhouse to avoid the wind and rain. He was miserable and depressed.

at a loss, he suddenly found a spider struggling to make a web in the corner of the room. The spider silk was blown off again and again, but the spider was not discouraged and finally made a web.

The general was deeply inspired, then rallied and finally defeated his opponent Napoleon at the Battle of Waterloo.

This general is the famous Wellington in history.

outside the window, the rain is still falling and the wind is still blowing, but I firmly believe that this spider will finally achieve its goal-weaving a complete web.

Since this incident, I no longer hate spiders. Although it is so ugly and disgusting, I can feel that there is a spirit in it called "never give up", which is exactly what I need.

Post: 32524 Pan Lingling (comments) of Class 5 (2) of No.4 Primary School in Tangxia Town, Ruian City, Zhejiang Province is a major feature of this composition.

The author is good at grasping the bits and pieces of life and describing his psychological process from hating spiders to not hating them, which gives people a refreshing feeling.

the content of the article is concrete and vivid.

Observing the spider mending the web in a thunderstorm can clearly write out the spider's every move and his mood changes during the observation, and can also quote short stories, which makes the lyric at the end come naturally.

(recommended by teacher Lin Bingcheng): 13157793459 Write a composition on the topic of spiders

Last night, I found a fat Mi Chong crawling on the dining table.

I asked my father, "Can you feed this fat Mi Chong to the little spider?" Dad said, "Of course.

"So, under the pressure of my father and me, this Mi Chong crustily skin of head landed on the spider's website.

To my great surprise, the little spider didn't bravely rush to catch its prey, but ran away.

Is the little spider afraid of the fat man? My father and I just stood there for a full minute.

The white and fat guy found out that he was cheated and struggled desperately to quit.

The spider's web has broken a hole, and it is almost successful. At this moment, the little spider ran out quickly and wrapped it tightly with silk. Mi Chong only left his head exposed, and he could not escape anyway.

So, a sumptuous feast of fat worms began ... A composition describing the appearance of spiders

When it comes to spiders, an ugly image will probably emerge in everyone's mind: eight bent and segmented legs, a spherical abdomen, and a pair of jaws with more or less toxins ... This image often makes people who don't know spiders think it is a pest.