Insects, formerly known as "hexadecids", are not only arthropod phylums, but also the most diverse and numerous class in the entire animal kingdom, and their tracks are almost everywhere in the world. There are about 1 million known species of insects, but many are still to be discovered.
Insects have the following characteristics: the body is divided into three parts: the head is divided into three parts: the head is not segmented, is the center of sensation and feeding, with mouth organs and 1 pair of antennae, usually there are compound eyes and one eye; the chest is the center of movement, with 3 pairs of feet, the general adult worm also has 2 pairs of wings, and some species are completely degenerated; the abdomen is the center of reproduction and nutrient metabolism, which contains reproductive organs and most of the internal organs; insects usually undergo a series of internal and external morphological changes in the process of growth and development, that is, the process of metamorphosis.
Insects are divided into wingless suborders (including 2 orders) and winged subclasses (including 29 orders).
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Stone borer
Representative animal: stone borer
Representative of the most primitive insects, living in damp deciduous leaves, decaying wood, ant nests. It mainly feeds on algae, lichens, mosses, fungi, and spoiled plants.
Clothing fish eyes
Representative animal: clothed fish
This insect is not only a moth for indoor dry storage, but also an important pest of archival books and cultural relics commonly found in libraries around the world.
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The eye
Representative animal: Ephemera
Adult insects do not feed, the life span is extremely short, can only survive for a few hours, up to 7 days, so there is a saying of life and death.
Odonata
Representative animal: Dragonfly
Dragonflies are carnivorous insects. They prey on a variety of agricultural and pastoral pests such as flies, mosquitoes, leafhoppers, midges and small butterfly moths.
Cockroaches
Representative animal: cockroach
Whether it's the hot equator or the cold polar regions; whether it's the off-the-beaten-path jungle or the bustling neighborhoods; from south to north, from east to west, they are everywhere.
Mantodea
Representative animal: praying mantis
In ancient Greece, people regarded the praying mantis as a prophet, because the praying mantis forearm was raised like a praying maiden, so it was also called a prayer worm.
Isoptera
Representative animal: termites
Termites are multimorphic, social insects, all of which live in groups, and large populations can contain more than 1 million individuals.
Zoraptera
Representative animal: Chinese wingless insect
Chinese wingless insects usually inhabit under the bark or soil of tropical rainforests and seasonal rainforests between the Tropic of Cancer and in seasonal rainforests, and prefer to move in groups. It feeds mainly on fungal spores and mites.
Profanctrines
Representative animal: stone fly
Small and medium-sized insects, winged or wingless, are known as stone flies because they often inhabit the stone surfaces of mountain streams.
Phasmida
Representative animal: Stick insect
The shape is slender like a bamboo knot, medium to large, with a body length of 6 to 24 cm, green or brown.
Orthoptera
Represented animal: locusts
The East Asian flying locust has the widest distribution range and the most serious harm in China, and is the most important locust species that cause locust plagues in China, mainly harming grass plants and is an agricultural pest.
Cockroaches
Representative animal: cockroach
Chinese cockroaches often inhabit lakes, swamps, melting snow or wet water at altitudes of 200 meters, hiding under stones, moss under dead wood and caves. It was first discovered in the Changbai Mountains of China in 1985, and is currently only distributed in the Changbai Mountains of Jilin and the Altai Mountains of Xinjiang, and is now a national key protected wild animal.
Embioptera
Representative animal: silk ant
Silk ant, basically resembling a dragonfly, has four wings, two tentacles, four legs, a slender body, and a surface covered with white wax.
Hemiptera
Represented animal: bugs
Plant-feeding, sucking up the sap of plant stems and leaves or fruits, is an important horticultural pest. Such insects have stinky glandular holes, which can secrete odorous liquid and volatilize into odorous gas in the air, so there are common names such as fart worms, bed bugs, and stinky big sisters.
Dermaptera
Representative animal: salamander (qu sou)
Many salamanders have two long pincers on their tails, which can be used both for courtship and hunting and fighting predators.
Heavy tongue
Representative animal: rat salamander
All are rodents in vitro parasites, eating rat skin crumbs, so called "rat flies"
Tamarinds
Representative animal: Thrips
The larvae are white, yellow, or orange, and the adults are yellow, brown, or black; they feed on plant sap or fungi. The body is tiny, 0.5-2mm long and rarely exceeds 7mm.
Rodents
Representative animal: rodent
Insects crawling vigorously are often seen in the bark or leaf litter. If you are accidentally bitten by a rodent, there will be a slight redness and swelling on the skin, which is very itchy.
Mallophaga
Representative animal: chicken lice
Chicken lice often parasitize in the feathers of chickens, generally do not suck blood, eat feathers or dander, making chickens itchy and uneasy.
Lice
Represents an animal: a body lice
Body lice is a type of lice, mainly on the human body, parasitizes inside the hair follicles, and lives by sucking blood.
Coleoptera
Representative animal: Celestial bull
Chewable mouthparts, which have long antennae, often longer than the length of the body. Plant-eating insects can harm woody plants.
Neuroptera
Representative animal: grasshopper
Grasshoppers can effectively prey on a variety of important agricultural pests in large quantities, and are important natural enemies of various types of aphids such as pine aphids, willow aphids, peach aphids, pear aphids and pine dried aphids.
Twisted-winged order
Representative animal: Twisted-winged insect
Parasitic insects, complex metamorphosis, hermaphroditism, some species parasitize in agricultural and forestry pests, is one of the natural enemy insect groups, a small number of parasitic bees are harmful to bee production.
Broad-winged order
Representative animal: toothed frog
The male has a long, curved upper jaw, up to 25 mm long, about 3 times the length of its head! Being bitten by such an upper jaw must not be a light injury, but in fact they are harmless, and males use the upper jaw when courting and mating.
Lepidoptera
Representative animal: nocturnal moth
The body is triangular, stout, with a wingspan of 8 to 305 cm, generally dark gray-brown, but some tropical species are bright and shiny, densely scaly. Evening and night flights. There is phototropism.
Snakeflies
Representative animal: snakefly
Snakeflies are slender, medium to large. The head is elongated, the posterior contraction is triangular, and the movement is free. Larvae that prey on insects, as beneficial insects.
Mecoptera
Representative animal: Scorpion
It mostly lives in damp and shaded forests, has weak flight ability, is carrivative, and feeds on arthropod carcasses. Some species feed on nectar, fruit, moss, etc.
Trichoptera
Representative animal: stone moth
Living in lakes and streams, stone moth larvae prefer colder, unpolluted waters, and are relatively weakly adapted to be insects that indicate the degree of pollution in water flows.
Diptera
Representative animal: flies
Adult insects can spread cholera, typhoid fever, dysentery and other diseases, and are important health pests.
Hymenoptera
Representative animal: wasp
A powerful long stinger needle on the body will attack in groups when encountering attacks or unfriendly interference, which can cause allergic reactions and toxic reactions, and in severe cases, can lead to death.
Siphonaptera
Representative animal: fleas
Exoparatic on mammals and birds, with stinging mouth organs, both male and female blood sucking; the larvae are cylindrical, free to live, with chewing mouth organs, feeding on adult blood feces or organic matter.