Beetles are insects that form the order Coleoptera, in the superorder Holometabola. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 400,000 described species, is the largest of all orders, constituting almost 40% of described insects and 25% of all known animal species; new species are discovered frequently, with estimates suggesting that there are between 0.9 and 2.1 million total species. Found in almost every habitat except the sea and the polar regions, they interact with their ecosystems in several ways: beetles often feed on plants and fungi, break down animal and plant debris, and eat other invertebrates. Some species are serious agricultural pests, such as the Colorado potato beetle, while others such as Coccinellidae eat aphids, scale insects, thrips, and other plant-sucking insects that damage crops.
The family Scarabaeidae, as currently defined, consists of over 35,000 species of beetles worldwide; they are often called scarabs or scarab beetles. The classification of this family has undergone significant change in recent years. Several subfamilies have been elevated to family rank, and some reduced to lower ranks. The subfamilies listed in this article are in accordance with those in Catalog of Life (2023).
The Japanese beetle is a species of scarab beetle. The adult measures 15 mm (0.6 in) in length and 10 mm (0.4 in) in width, has iridescent copper-colored elytra, and a green thorax and head. Due to natural predators, the Japanese beetle is not considered a pest in Japan, but in North America and some regions of Europe, it is a noted pest to roughly 300 species of plants. Some of these plants include rose bushes, grapes, hops, canna, crape myrtles, birch trees, linden trees, and others.
The common cockchafer, colloquially called the Maybug, Maybeetle, or doodlebug, is a species of scarab beetle belonging to the genus Melolontha native to Europe. It is one of several closely related and morphologically similar species of Melolontha called cockchafers, alongside Melolontha hippocastani. The adults and larvae feed on plants, and are regarded as serious agricultural pests of crops such as grasses and fruit trees.
The noble chafer is a species of beetles belonging to the family Scarabaeidae, subfamily Cetoniinae.
The Tenebrionoidea are a very large and diverse superfamily of beetles. It generally corresponds to the Heteromera of earlier authors.
Phyllophaga is a very large genus of New World scarab beetles in the subfamily Melolonthinae. Common names for this genus and many other related genera in the subfamily Melolonthinae are May beetles, June bugs, and July beetles. They range in size from 12 to 35 mm and are blackish or reddish-brown in colour, without prominent markings, and often rather hairy ventrally. These beetles are nocturnal, coming to lights in great numbers.
Cleridae are a family of beetles of the superfamily Cleroidea. They are commonly known as checkered beetles. The family Cleridae has a worldwide distribution, and a variety of habitats and feeding preferences.
Macrodactylus subspinosus is a North American beetle of the family Scarabaeidae. The members of its genus are known as "rose chafers", not to be confused with the European rose chafer, Cetonia aurata. M. subspinosus occurs from Eastern Canada to Colorado and is considered a pest of many crops and flowers. It is given its common name of rose chafer because it eats the leaves of roses, although it also feeds on many other plants.
Pachnoda sinuata, the garden fruit chafer or checkers tor or brown-and-yellow fruit chafer, is a species of beetle found in Namibia, South Africa and Egypt.
Paenibacillus popilliae is a soil-dwelling, Gram-positive, rod-shaped bacterium. It is responsible for a disease of the white grubs of Japanese beetles.
Cotinis mutabilis, also known as the figeater beetle, is a member of the scarab beetle family. It belongs to the subfamily Cetoniinae, comprising a group of beetles commonly called flower chafers since many of them feed on pollen, nectar, or petals. Its habitat is primarily the southwestern United States and Mexico. Figeater beetles are often mistaken for green June beetles and occasionally Japanese beetles, which occur in the eastern US.
Eupoecila australasiae, commonly known as the fiddler beetle or rose chafer, is a colourful green- or yellow-and-black member of the scarab beetle family from eastern Australia.
The European chafer is a beetle of the family Scarabaeidae. Formerly found only in continental Europe, this invasive species is now found at temperate latitudes in North America. The large, white grubs of A. majale feed on the roots of most cool-latitude grasses, both wild and cultivated. This has made the European chafer an enemy of lawns.
Derobrachus hovorei is a species of beetle in the family Cerambycidae, known variously as the palo verde beetle, palo verde root borer, or palo verde borer beetle. For over 100 years, this species was confused with the related species Derobrachus geminatus, and only recognized and given its own name by Santos-Silva in 2007; essentially all literature prior to 2007 therefore incorrectly uses the name geminatus for this species. It is a longhorn beetle native to the southwestern United States and northern Mexico which derives its common name from the palo verde tree, and it is one of the largest beetles in North America, reaching up to three and a half inches in length. Adults are black or brown in colour, have long antennae, and spines on the thorax. They have wings and can fly, albeit awkwardly at times. Mature beetles emerge in the summer to mate. Adults do not eat, and rely solely on their energy reserves until they die in about one month. While not harmful to humans, they can bite in self-defense.
Phyllopertha horticola, the garden chafer or garden foliage beetle, is a beetle from the family Scarabaeidae. Phyllopertha horticola was described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae.
Pyronota festiva, commonly known as mānuka beetle or mānuka chafer, is a member of the genus Pyronota of the beetle family Scarabaeidae. It is a scarab beetle endemic to New Zealand, and is commonly found in mānuka trees, hence the beetle's name. In some areas it is considered a pasture pest.
Cyclocephala lurida, the southern masked chafer, is a species of beetle in the family Scarabaeidae which is native to the southeastern United States. It is a brown beetle with a black head, with an adult length of 10 to 14 mm. The adult beetles cause no harm, but the eggs are laid underground and the developing larvae feed on grass roots and can kill turf under dry conditions.
Trichiotinus is a genus of fruit and flower chafers in the family Scarabaeidae. There are about 8 described species in Trichiotinus, all native to the New World.
Stethaspis is a genus of beetles in the family Scarabaeidae, subfamily Melolonthinae.
