The history of the study of mayflies, what is a mayfly

Mayflies are the most primitive winged insects.

Mayfly is one of the most primitive winged insects, although it is said to have wings, but the wings of mayflies can not be folded, the larvae of mayflies live in water, and adults cannot eat any food, so the life span of adult mayflies is very short, the shortest can only live for a few hours.

Mayflies grow in the Mizusawa area, and the larval stage is slightly longer, and some species live to two or three years. However, after becoming an adult, that is, without drinking or eating, it flies in the air and mates, and after completing the continuation of its species, it ends its life, and generally dies in the twilight of life. Mayflies like to fly in groups at sunset, and when they are in full bloom, they fall to the ground after death, and can accumulate into a thick layer.

Introduction to mayflies

Mayfly is a kind of insect, also known as overnight old, night old, with an ancient and special shape, mainly distributed in the tropical to temperate zone, about 30 to 50 species are known in the world, and about 36 species are known in China. It can be divided into the same class as dragonflies, and the mayfly insects are slender and soft, usually 3 to 27 mm in length, with short antennae, well-developed compound eyes, large mid-chest, well-developed forewings, and vestigial hindwings.

The mouthparts are chewing, but the upper and lower jaws are vestigial and have no ability to chew. Wings membranous, wing veins reticulated. The forewings are large and triangular.

The hindwings are vestigial and significantly smaller than the forewings. The wing veins are primitive, and the wings stand erect on the back when resting. The male has elongated forefeet and is used to catch the female in flight to facilitate mating.

Adult mayflies are often found near streams and beaches.

Causes of reproduction and environmental impacts on water quality.

The first is the reason for mating. A large number of mayflies generally mate in spring and autumn, and this season just meets the requirements, so so many mayflies suddenly appear, that is, they are reproducing, which is explained from the biological characteristics.

Clause. Second, the environmental impact of water quality, mayflies are biologically known as environmental indicator organisms, whether they are not mating, can adapt to such a large-scale mayfly living area, must be a very good environment, water quality conditions must have reached a high standard, the more mayflies prove that the local water quality is better.

When a large number of mayflies appeared in Dengzhou, Henan, we explained that it was because the water quality and environment had improved, so we saw their activities, which is a normal situation.

Don't be surprised to see a large number of mayflies, it is a normal mating activity, and it also reflects that the local water quality and environment are very good, and there is no connection with natural disasters, so you don't need to be nervous.

We can see from the water area of Yuanjiang City, which is as high as 10,000 hectares, accounting for the total land area of Yuanjiang City, ranking first in the province. That is, because of the good aquatic environment, the aquaculture industry in this region is very developed, with 25 inner lakes, 4 dumb rivers, more than 400 river bays and lakes, 253 ditches, 27,335 small and medium-sized ponds, 220 species of aquatic organisms, and 114 species of fish.

The lifespan of adult mayflies is only a few hours to a few days, so there is a saying that "life is born and dies". Mayflies are a primitive and beautiful class of insects that originated in the Carboniferous period and are at least 200 million years old, and are the most primitive winged insects.

Mayfly. Mayfly insects are slender and soft, usually 3-27mm in length, short antennae, developed compound eyes, large mesothorax, developed forewings, vestigial hindwings, a pair of very long tail whiskers at the end of the abdomen, and some species also have **tail filaments.

Mayfly larvae live in a variety of freshwater habitats, most of which are found in living water at moderate temperatures and in constant flow, a few can survive in saltwater, and one even survives on land, and adult life is generally spent in flight.

Adult mayflies are often active near streams, beaches and lakes, and can be used to detect the type and degree of pollution of water according to their adaptation and requirements to waters.

Mayfly is a very ancient winged insect, although it is said to have wings, but the wings of mayflies can not be folded, the larvae of mayflies live in water, and adults can not eat any food, so the life span of mayfly adults is very short, the shortest can only live for a few hours, it can be said that this kind of life is a lot of animal creatures are willing to bow down. Basically, you are going to leave as soon as you are born.

Although the lifespan of mayflies is very short, the development history of mayflies is very long, according to scientists, mayflies appeared about 200 million years ago, and even earlier than that. It can be said that mayflies are living fossils, but it is also difficult to imagine that such a short-lived mayfly is a creature 200 million years ago.

The role of mayflies is more obvious, that is, to measure the degree of environmental pollution in an area, it has been found that mayflies are very sensitive to hypoxia and acidic environment, so the number of mayflies in an area can be used as a yardstick to measure the environmental pollution in this area.

Of course, mayflies are also harmful, as early as 2014, because of a large number of mayflies invaded the United States, which directly led to some local traffic being affected, a large number of mayflies were densely packed, reducing the visibility of the road, resulting in several more serious traffic accidents in the United States at that time. But in general, mayflies are not too harmful, mainly because the aforementioned mayflies have a short lifespan.

Mayflies are the most primitive winged insects. It can be divided into the same class as dragonflies, and their wings cannot be folded. Mayfly insects are slender and soft, usually 3-27mm in length, short antennae, developed compound eyes, large mid-chest, developed forewings, vestigial hindwings, a pair of very long tail whiskers at the end of the abdomen, some species also have **tail filaments, juveniles are aquatic, adults do not feed, and the life span is very short, the shortest is only one day.

Adult mayflies don't eat, and after molting, their digestive tract fills with air — before the last molt, the midgut heals to form a closed, sausage-like balloon.