The insect order Coleoptera is known as the Beetle family. The Greek words for “sheathe” and “wing,” respectively, are keleos and pteron, which translate to “sheathed wing” and “coleoptera,” respectively. The front pair of wings, known as the “elytra,” of most beetles, which have two pairs in total, are hardened and thickened to serve as a protective sheath or shell for the rear pair and the back portion of the beetle’s body. Almost 25% of all known life forms are members of the order Coleoptera, which has the most species of any other order. There are over 400,000 species of beetles, which make up about 40% of all described insect species, and more are continuously being discovered. A hundred million species, both known and unknown, have been estimated to exist overall. Beetles are found in a very wide variety. Except for the ocean and the polar regions, they can be found in all major habitats. Some species can adapt to almost any type of diet. The largest family of insects, the Scarabaeidae, has more than 30000 different species worldwide. The Beetle can be viewed as a pest because many of these plants are crucial for forestry, agriculture, and domestic use. Beetles are not only a nuisance, but they can also be helpful by reducing insect numbers. The ladybug or ladybird is one of the best and most well-known examples (family Coccinellidae). On aphid colonies, the larvae and adults are observed feeding. Other ladybugs consume mealybugs and scale insects as food. They may eat other things like tiny caterpillars, juvenile plant bugs, honeydew, and nectar if their usual food supplies are lacking. Predators of several insects and other arthropods, such as fly eggs, caterpillars, wireworms, and others, include ground beetles (family Carabidae). Pestilent flies and parasitic worms that breed in bovine manure have been successfully controlled by dung beetles (Coleoptera, Scarabaeidae). Dung beetles are a crucial part of the terrestrial ecology both taxonomically and functionally.
The largest order of insects belongs to the class Coleoptera. There are over 350,000 species in 115 groups that are currently known to exist there, but according to recent estimates, there may be hundreds of thousands or perhaps millions of undiscovered species. Beetles are tremendously diverse in terms of size, form, and ecological tactics in addition to being extremely rich in species (Lawrence and Britton, 1991; Balke et al., 2002).