Chapter 411

In a transparent square glass box, a snail is creeping slowly.

It is an amber snail, distributed in all parts of the country a snail.

It used to live in those dark and humid places, such as grass, ditches and so on. It not only likes heat and humidity, but also can withstand drought and cold. It can also float on aquatic plants and water surface. It feeds on humus, as well as lichens, fungi, bryophytes, algae, and young leaves of plants.

The shell size of amber snail varies greatly, usually long oval, with 3-4 spiral layers. The shell is 5-15 mm high and 3-8 mm wide. The shell is thin, and the shell surface is light yellow or yellowish brown, and its body is transparent or translucent and glossy.

But the snail in the glass box, the two antennae are particularly swollen. Compared with the normal amber snail, it is like two abominable accretions.

Moreover, in its transparent body, you can clearly see something in it, but not its internal organs.

All of a sudden, it began to creep at a speed that snails would not normally achieve.

Its two swollen antennae, reflecting bright light, like two drill bits, constantly rotating, constantly flickering.

"Students, this is a snail infected with parasites. The color and light you see are actually a lot of parasites crawling in it

In the biology class of this university, with the teacher's words, the teaching screen plays a slow motion image with a magnification of ten times. The students all see the creepy details, which are really not natural luster.

It's the snails that are full of parasites, one by one, pushing and beating.

"That's the diplococcus. They changed the snail's body shape and controlled the snail's brain."

The images on the teaching screen are changed, double disk trematodes, and parasites that look very large in the camera.

These biology students, some frown, some curious, some already know.

"First, the snail ate the eggs of the trematode." The middle-aged man's teacher said, "this is how the parasite enters the host."

"After that, the eggs develop into sporangia, which mainly parasitize in the liver of snails. At this time, the snail or nothing abnormal performance. It may not even know that it has worms in its body, and the nutrients it takes from it are constantly stolen by parasites. We're not snails, we're not sure about that, and we don't know exactly how they feel

There was a chuckle in the classroom, but the students soon quieted down.

They looked at a screen simulation that showed how the parasite grew cercariae, then how it grew, and then branched out from the snail's body into the two antennae, forming a complete sporangium full of larvae.

It is they that cause the snail's antennae to expand, unable to contract normally, and can only hang brightly outside.

Looking at these pictures, some students really feel that the snail parasitized by diplopsis is too poor.

"Once it gets into the snail's eyestalk, the Diplodocus begins to be able to control its host. Snails originally like to move at night, but after being controlled, they will become active in the daytime and places with sufficient light, and the speed of movement is three times that of normal snails, which may be the physiological limit of snails

The teacher indicated the diseased snail in the glass box on the platform. Its antennae twinkled like a neon light.

"It has not been studied what way does diplococcus control snails. Students, I'll see you in the future.

But this kind of parasite is really smart. They make the snail colorful, make it unconscious of fear, swagger in the sun, so eye-catching, but also control the snail to climb higher leaves, those particularly conspicuous places. What for? Just for the birds to see. Birds have a look there is a shiny thing, that shape is insects, fly over to eat. It's actually a snail's antennae, and it's full of trematodes. "

The teacher pauses, picks up the chalk and writes down to the blackboard, emphasizing: "aggressive mimicry, in this case, the parasite benefits."

Aggressive mimicry is a biological concept. In short, organisms use mating commitment, false food and other means to deceive their prey.

For example, pitcher plants mimic flowers to trap nectar harvesting insects. Eating, living and reproducing are the wisdom of nature.

"The snail is the first intermediate host." As the teacher wrote on the blackboard, he said, "birds are the second intermediate host. After entering the body of a bird, the trematode reproduces there, and then the eggs are excreted with bird droppings, which are eaten by other snails It goes on and on. "

The students got goose bumps when they heard it. The Diplodocus used snails as false food and birds as their prey.

A little parasite, which is a tiny bit big, has such a sinister and grotesque trick.

And distinguish day and night, high and low, conspicuous and hidden.

Whether it's intelligence or instinct, it's amazing."Teacher, can diplopsis control birds?" Asked a male student.

"There is no evidence of this."

"Can it enter the body?"

"It's not a human parasite." The teacher said with a smile, "our human body is more complex than snails and birds. We have a stronger defense system, and can resist the diplococcus. But we also have a lot of parasites to deal with, such as the Clematis is very difficult to do. I know what you're asking. No, there's no parasite that controls human thought and behavior

"Maybe there's still one. It's called money." The teacher said, "money in English and AES in Latin."

In the classroom, there was another chuckle from the students.

Indeed, humans are not snails, and parasites are not easily controlled.

And at the same time, in the transparent glass box, the snail was wriggling wildly for a second.

……

Beep, beep, beep.

"Hello, is this Wang Jiawei's mother? I'm Li Yuhao's mother. Yes, our son lives in a dormitory. "

"Hello, mother Yuhao. What can I do for you?"

"Well, Yu Hao told us last night that he and some of his classmates went to your house to have a party and spend the night there. I called him in the morning, no one picked him up. It's almost noon now, but no one picked him up. He hasn't come home yet. I also have Jiawei's number here, as well as several other students. I called them, and no one answered them... "

"So Yuhao's mother, Jiawei and I are out of town these days. Don't worry. The young people will have a party very late. They don't have to go to school today. It's not surprising that they don't have to go to school all night. Maybe they haven't woken up now, and no one answers. "

"I think so, but it's a little strange These children don't have a circle of friends. They didn't send out a few articles at any previous party? "

"Well How about this? I'll ask the property management department to send someone to my house to see what's going on. Maybe you're drunk? "

"Good, mother Jiawei. I'll trouble you."

"Oh, you're welcome. This is Jiawei's party."

The call is over.

Less than half an hour later, the call was connected again.

"Hello, mother Yuhao? The security guard went to see it just now. No one was at home. I also found that my garage was open. I took a look at the picture and found that a MPV was driven away. I asked the security guard to check the monitoring of the community. The car was driven out last night. Jiawei drove the car. Yuhao and they were all in the car... "

"What Can Jiawei drive? Here, where have they been? "

"I don't know, Yuhao mother. It should be OK. Young people just go crazy. Let's not mess up."

"Stop talking. Call the police. Let's call the police."

"Wait, don't make a big fuss before it gets to that Yuhao mother, you don't think it's Jiawei who drives the car. You think I only think about my son. What if it's all of them who do bad things? We don't know. I mean, if they touch marijuana or ecstasy, the police will destroy them. We have to think about the children. "

"Ah! You They are safe now, is not our first consideration! My Yuhao is not a drug addict. "

"I'm an analogy. Wait a minute, Yuhao mother. Look at your circle of friends! I see that Jiawei has just set up a circle of friends. Do you want to see if Yuhao has any hair? "

"Ah, let me see. Oh, yes, yes, yes! Yu Hao just sent one. Why didn't the child answer the phone when he was there? I'm scared to death if I don't call back to report a letter. Ah, really. What does this circle of friends mean "I have seen God, and I am his incarnation in the human world."

“…… Jia Weifa's is also such a sentence, did they go to some concert to see which idol? "

"Probably, the child Jiawei's mother, first of all, I'll call Yuhao and wait for him to go home. I won't smoke him. "

"Young people don't have to beat and scold when they go crazy. But Jiawei, I'm going back to clean him up."

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