There are 7 species of cicadas that will break through the soil for more than ten years, which 7 spe

The so-called 7 kinds of cicadas that will break through the soil for more than ten years is completely misinformation. The reason is that there is an article on the part of **, which reads "Trillions of cicadas are pouring into the United States, is it a blessing or a curse?" ”。

As mentioned in the article, there are 7 species of cicadas that have broken through the soil for more than ten years.

Strictly speaking, this cicada is supposed to be a cyclical cicada in North America. There are 7 species in the genus Periodic Cicada, which can be divided into 30 groups according to their respective years, including 17-year-old cicadas and 13-year-old cicadas. According to the analysis of some scholars, these cicadas, which have been hidden for more than ten years, will sweep across 15 states in the United States.

However, cicadas, unlike locusts, do little harm, and the end result is to feed other species.

The annual and 13-year cicadas have seven species in the genus "Periodic Cicada, and they are only found in North America and have never been found on other continents," Professor Sorkin said.

According to foreign scholars, there is a unique periodic cicada in North America. This cicada has a long life cycle and can reach more than ten years. The cicada is divided into 7 species and group 30, with the period from group 1 to group 17 being 17 years, and the cycle from group 18 to group 30 reaching 13 years.

That is, we often call the 17-year-old cicada and the 13-year-old cicada.

They do not have specific names, and scholars only use number groups to classify them when they are called. Judging by the year, what swept the United States in 2021 should belong to the 17-year cicada.

2. The cycle of cicadasMany people's perception of cicadas is that they can only survive for more than ten days, and not more than two months at most. In fact, this perception is wrong, the cycle is the survival length of the cicada, but the first half of its life has been living under the ground, and when the right time comes, it will run to the ground to mate.

The cicadas that have completed mating have almost reached the end of their lives, and the next thing that awaits them is death. The eggs laid will fall over a period of time and enter the ground to survive. This is their way of life, which we can understand as samsara.

As for why it is 13 years or 17 years, some scholars say that it is to avoid natural predators, and some scholars say that it is to prevent species from interbreeding.

3. Cicadas are not harmful, and most of the titles given on the Internet are misleading. Trillions of seventeen-year-old cicadas give people a very terrifying feeling, and it seems that they will only appear in **. In fact, cicadas do not do much harm, they have almost no effect on humans and other species, at most they eat some small saplings.

When it comes to harm, there is only one thing I can think of, and that is the call of cicadas. In the summer, the cicadas chirp so loudly that noisy people can't sleep. However, there are relatively few cicadas in urban areas, and this phenomenon generally does not exist.

And in China, cicadas are a kind of food, and many people go to catch cicadas in the middle of the night, which will not form a "sweeping" trend.

There is no authoritative conclusion on how many years the cicada's larval stage is. One is because there are many types of cicadas, and the other is because young cicadas live underground and cannot be traced and studied. It is said that there is a seventeen-year-old cicada in the Americas, and although this cicada appears every summer, the local people found that this cicada has a peak in number every seventeen years, so it is speculated that the larval stage is seventeen years, that is, the breeding cycle of this cicada is seventeen years.

This speculation makes sense, but it is still speculation after all. In the end, the larval stage of the cicada is several years, and I personally think that it will vary depending on the type of cicada, even if it is the same cicada, it is likely to be different depending on the nutrient supply conditions or other environmental conditions in the location, which is also my personal speculation, and there is no scientific basis.

Of the 3,000 species of cicadas in the world, only 7 have synchronous life cycles, meaning they emerge every 13 or 17 years. This periodic cicada lives only in the central and eastern United States. The large-scale appearance of cicadas can cause some damage to trees, but they do not devour crops like locusts.

Instead, they contribute to the ecosystem by pruning branches and returning nutrients to the soil after death, and they also provide abundant food for birds and other animals**. The periodic cicada is a very amazing and special insect.

There are not so many cicadas that will break through the soil for more than ten years, and generally only prime cicadas will break out in the soil for more than ten years. In summer, the growth cycle of the cicada is shorter.

Drill the surface at dusk and at night.

The larvae of cicadas live in the soil and have a pair of strong digging forefeet. The sap of plant roots is sucked by the stinging and sucking mouthparts of the tree, which weakens the strength of the tree, makes the branches die, and affects the growth of the tree. Usually stay in the soil for a few years or even more than ten years, such as 3 years, 5 years, and 17 years, these numbers have one thing in common, they are all prime numbers.

This is because there are very few factors in prime numbers, and when they drill out of the soil, they can prevent them from drilling out with other cicadas and competing for territory and food. When it is about to be feathered, it burrows out of the surface at dusk and at night, climbs on a tree, and then grabs the bark of the tree to molt and feather. When a black crack appears on the back of a cicada pupa, the molting process begins.

The female lays her eggs on a branch, and when the young cicadas hatch, they immediately climb down, burrowing all the way into the soil, where they begin their long underground sail life. The young cicadas have to stay underground for so long, firstly, because they are developing slowly, and secondly, they have to wait for the right time to break through the ground. Different species of cicadas will choose their first after birth.

Three, five, seven, ten.

1. Unearthed after the 13th or 17th year of orange high.

These numbers have one thing in common, they are all prime numbers. This is because there are very few factors in prime numbers, and when drilling out of the soil, they can prevent them from burning and hailizing together with other cicadas, competing for territory and food.

Although there are more than 20,000 kinds of cicadas in our country, the appearance of the cicada is basically similar, there are differences in size and body color, and there are generally three common ones: one has a black body, a large --- is the largest number, it can not only be used but also used medicinally, and emitted: the cry of the --- of the , its common name, and the other is green, medium height, and it is issued

The cry of the --- of the --- of the Leaves is called the chilling cicada; There is also a small gray man, who makes a cry of "squeak---squeak--- called a cockroach." The reason why these three types of vocalizations are different is because their vocal organs are different in size, with the larger ones screaming louder, and the smaller ones screaming softer.

1. Spring cicadas: The cicadas that chirp first in spring, and the call is chirp-chirp-. It is centimeter long, found in mountainous areas, and appears between June and July.

2. Chilling cicada; The body length is about centimeters, the cephalothorax is pale green, and it is very common everywhere after August every year. In October, it will also chirp. Because it is called happy in the late autumn season, it is also called the autumn cicada.

3. Mountain cicada; It is about centimeters long, lives in mountainous areas, and is characterized by often stopping on pine trees and chirping.

4. an oil cicada; The most common species, about centimeters long.

5, Ji Ningmu; It is 2-3 cm long, and is more common in warmer areas, and there is a group chorus in July every year.

6, chirping cicada; It is centimeter long, and it is more common after September every year, and often stops on pine trees and chirps.

7. a grass cicada; The body length is centimeters, and it belongs to the species of small cicadas. It is found in sugar cane plantations from March to July every year.

8. a bear cicada; It is 4-5 cm long, black and shiny, and there are many warm areas, and it often chirps in the morning.

9. a cockroach; It is 2-6 cm long and has a flat body. It starts to chirp when the rainy season stops.

10. Japanese (Yaeyama) cockroach; The body length is centimeters, and it is a relative of the cockroach cricket: the body size is flatter than the cockroach.

Cicada species include grasshoppers, cockroaches, grass cicadas, spotted cicadas, thin-winged cicadas, etc.

1. Grasshopper: also known as chirping lizard, horse lizard, chirping cicada, autumn cicada, spider, grasshopper, etc., the male body is long and wide, long centimeters, wingspan centimeters, and the female is slightly shorter, black and shiny.

2. Cockroach: a relatively small cicada, about centimeters long, with black stripes, black hindwings except for the edges, widely distributed, May to June singing, from morning to night.

3. Grass cicada: a common species in low-altitude and flat grasses, adults appear in spring and summer, often active in grass and other green leaves, body length 13-15 mm, the front edge of the head is slightly high, the draft mountain is triangular, and the body color is changeable.

4. Spotted cicada: There are a pair of markings on the inside of the compound eyes on the top of the head, 4 markings on the dorsal plate of the mid-thorax, the spots on the ends of the fore and rear wings are grayish-white, the boundaries are not obvious, and there are 5 yellow-brown spots on the basal half.

5. Thin-winged cicada: 20-23 mm long, the width of the head is longer than the length and width of the chest, the head is slightly triangular in shape, there are three red jewel-like single eyes between the two eyes, and the front edge of the head Jingzen has a distinct black edge.

1. Cicadas usually begin to emerge between the beginning and middle of July every year, but the climate is different, and the unearthing time of the ridge sail is also different in various places, and it is not fixed.

2. If you want to catch the wild lurk, you can often listen to the sound of cicadas during the day. If there is a faint sound of cicadas, it means that it has begun to be unearthed.

3. Its excavation time is generally around 7 o'clock in the evening, especially on rainy days.

4. Because of the low pressure in rainy weather, the ground is stuffy, and it will climb out a lot.