Beetle is the general name of Coleoptera insects, belonging to the pteridoptera, holomorphic class. The body has a hard shell outside, the front wing is horny, thick and hard, and the back wing is membranous, such as beetles, longicorn beetles, weevil, etc. Most of the species belong to the world distribution, and many of them are important pests of agricultural and forestry crops, which are closely related to the economic interests of human beings.
Beetle is the oldest type of insects, it flourished in the upper Jurassic or lower Baikui period. At that time, higher plants did not appear, nor did Hymenoptera and Lepidoptera. Beetles were the earliest pollinators in geological history.