1 million species, accounting for 2/3- 3/4 of the known species in the animal kingdom. It can be seen that there are still 9% species of insects in the world that we don't know. According to the most conservative estimate, there are at least 3 million species of insects in the world, and there are still 2 million species of insects to be discovered, described and named. At present, about 1 new insect species are published every year in the world, and they are included in Zoological record. Therefore, this magazine is a retrieval tool that researchers engaged in animal classification must consult.

Among the named insects, there are as many as 35, species of COLEOPTERA (Beetle), among which the weevil is the largest, including more than 6, species, which is 1 times that of mammals. Lepidoptera (butterfly and moth) comes next, with about 2, species. There are about 15, species of Hymenoptera (bees and ants) and Diptera (mosquitoes and flies). The figure below shows the relative number of known species of different groups in the animal kingdom.

There are not only many kinds of insects, but also a large number of individuals of the same insect, some of whom are surprisingly large. An ant colony can be as many as 5, individuals. A tree can have 1, aphids. In the forest, there are 1, collembola insects per square meter. When locusts broke out, the number of individuals could reach 7-1.2 billion, the total weight was about 1,25-3, tons, and the area covered by swarms could reach 5-1,2 hectares, which can be said to be the day when the sky was covered. It can't be all of them. What humans have discovered now is less than half of the total. If you want to know these existing ones, you can press the system. For example, animal phylum and plant phylum. Insecta, phylum Animalia.