Beetle(Redirected from Coleoptera)
Beetles are a group of insects that form the order Coleoptera, in the superorder Endopterygota. Their front pair of wings is hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 400,000 species, is the largest of all orders, constituting almost 40% of described insects and 25% of all known animal life-forms; new species are discovered frequently. The largest of all families, the Curculionidae (weevils) with some 70,000 member species, belongs to this order. They are 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 (ladybirds or ladybugs) eat aphids, scale insects, thrips, and other plant-sucking insects that damage crops.
Temporal range: 318–0 Ma Late Carboniferous–Holocene
|Clockwise from top left: female golden stag beetle (Lamprima aurata), rhinoceros beetle (Megasoma sp.), long nose weevil (Rhinotia hemistictus), cowboy beetle (Chondropyga dorsalis), and a species of Amblytelus.|
Beetles typically have a particularly hard exoskeleton including the elytra, though some such as the rove beetles have very short elytra while blister beetles have softer elytra. The general anatomy of a beetle is quite uniform and typical of insects, although there are several examples of novelty, such as adaptations in water beetles which trap air bubbles under the elytra for use while diving. Beetles are endopterygotes, which means that they undergo complete metamorphosis, with a series of conspicuous and relatively abrupt changes in body structure between hatching and becoming adult after a relatively immobile pupal stage. Some, such as stag beetles, have a marked sexual dimorphism, the males possessing enormously enlarged mandibles which they use to fight other males. Many beetles are aposematic, with bright colours and patterns warning of their toxicity, while others are harmless Batesian mimics of such insects. Many beetles, including those that live in sandy places, have effective camouflage.
Beetles are prominent in human culture, from the sacred scarabs of ancient Egypt to beetlewing art and use as pets or fighting insects for entertainment and gambling. Many beetle groups are brightly and attractively coloured making them objects of collection and decorative displays. Over 300 species are used as food, mostly as larvae; species widely consumed include mealworms and rhinoceros beetle larvae. However, the major impact of beetles on human life is as agricultural, forestry, and horticultural pests. Serious pests include the boll weevil of cotton, the Colorado potato beetle, the coconut hispine beetle, and the mountain pine beetle. Most beetles, however, do not cause economic damage and many, such as the lady beetles and dung beetles are beneficial by helping to control insect pests.
The name of the taxonomic order, Coleoptera, comes from the Greek koleopteros (κολεόπτεροσ), given to the group by Aristotle for their elytra, hardened shield-like forewings, from koleos, sheath, and pteron, wing. The English name beetle comes from the Old English word bitela, little biter, related to bītan (to bite), leading to Middle English betylle. Another Old English name for beetle is ceafor, chafer, used in names such as cockchafer, from the Proto-Germanic *kabraz- (compare German Käfer).
Distribution and diversityEdit
Beetles are by far the largest order of insects: the roughly 400,000 species make up about 40% of all insect species so far described, and about 25% of all animals. A 2015 study provided four independent estimates of the total number of beetle species, giving a mean estimate of some 1.5 million with a "surprisingly narrow range" spanning all four estimates from a minimum of 0.9 to a maximum of 2.1 million beetle species . The four estimates made use of host-specificity relationships (1.5 to 1.9 million), ratios with other taxa (0.9 to 1.2 million), plant:beetle ratios (1.2 to 1.3), and extrapolations based on body size by year of description (1.7 to 2.1 million).
Beetles are found in nearly all habitats, including freshwater and coastal habitats, wherever vegetative foliage is found, from trees and their bark to flowers, leaves, and underground near roots - even inside plants in galls, in every plant tissue, including dead or decaying ones.
The heaviest beetle, indeed the heaviest insect stage, is the larva of the goliath beetle, Goliathus goliatus, which can attain a mass of at least 115 g (4.1 oz) and a length of 11.5 cm (4.5 in). Adult male goliath beetles are the heaviest beetle in its adult stage, weighing 70–100 g (2.5–3.5 oz) and measuring up to 11 cm (4.3 in). Adult elephant beetles, Megasoma elephas and Megasoma actaeon often reach 50 g (1.8 oz) and 10 cm (3.9 in).
The longest beetle is the Hercules beetle Dynastes hercules, with a maximum overall length of at least 16.7 cm (6.6 in) including the very long pronotal horn. The smallest recorded beetle and the smallest free-living insect (as of 2015), is the featherwing beetle Scydosella musawasensis which may measure as little as 0.325 mm in length.
The oldest known fossil insect that unequivocally resembles a Coleopteran is from the Lower Permian Period about (mya), though these members of the family Tshekardocoleidae have 13-segmented antennae, elytra with more fully developed venation and more irregular longitudinal ribbing, and abdomen and ovipositor extending beyond the apex of the elytra. In the Permian–Triassic extinction event at the end of the Permian, some 30% of all insect species became extinct, so the fossil record of insects only includes beetles from the Lower Triassic . Around this time, during the Late Triassic, fungus-feeding species such as Cupedidae appear in the fossil record. In the stages of the Upper Triassic, alga-feeding insects such as Triaplidae and Hydrophilidae begin to appear, alongside predatory water beetles. The first weevils, including the Obrienidae, appear alongside the first rove beetles (Staphylinidae), which closely resemble recent species. Some entomologists are sceptical that such early insects are so closely related to present-day species, arguing that this is extremely unlikely; for example, the structure of the metepisternum suggests that the Obrienidae could be Archostemata, not weevils at all, despite fossils with weevil-like snouts.
In 2009, a fossil beetle was described from the Pennsylvanian of Mazon Creek, Illinois, pushing the origin of the beetles to an earlier date, . Fossils from this time have been found in Asia and Europe, for instance in the red slate fossil beds of Niedermoschel near Mainz, Germany. Further fossils have been found in Obora, Czech Republic and Tshekarda in the Ural mountains, Russia. However, there are only a few fossils from North America before the middle Permian, although both Asia and North America had been united to Euramerica. The first discoveries from North America made in the Wellington formation of Oklahoma were published in 2005 and 2008.
As a consequence of the Permian–Triassic extinction event, the fossil record of insects is scant, including beetles from the Lower Triassic. However, there are a few exceptions, such as in Eastern Europe. At the Babiy Kamen site in the Kuznetsk Basin, numerous beetle fossils were discovered, including entire specimens of the infraorders Archostemata (e.g. Ademosynidae, Schizocoleidae), Adephaga (e.g., Triaplidae, Trachypachidae) and Polyphaga (e.g. Hydrophilidae, Byrrhidae, Elateroidea). However, species from the families Cupedidae and Schizophoroidae are not present at this site, whereas they dominate at other fossil sites from the Lower Triassic. Further records are known from Khey-Yaga, Russia, in the Korotaikha Basin.
During the Jurassic ( ), there was a dramatic increase in the diversity of beetle families, including the development and growth of carnivorous and herbivorous species. The Chrysomeloidea diversified around the same time, feeding on a wide array of plant hosts from cycads and conifers to angiosperms. Close to the Upper Jurassic, the Cupedidae decreased, but the diversity of the early plant-eating species increased. Most recent plant-eating beetles feed on flowering plants or angiosperms, whose success contributed to a doubling of plant-eating species during the Middle Jurassic. However, the increase of the number of beetle families during the Cretaceous does not correlate with the increase of the number of angiosperm species. Around the same time, numerous primitive weevils (e.g. Curculionoidea) and click beetles (e.g. Elateroidea) appeared. The first jewel beetles (e.g. Buprestidae) are present, but they remained rare until the Cretaceous. The first scarab beetles were not coprophagous but presumably fed on rotting wood with the help of fungus; they are an early example of a mutualistic relationship.
There are more than 150 important fossil sites from the Jurassic, the majority in Eastern Europe and North Asia. Outstanding sites include Solnhofen in Upper Bavaria, Germany, Karatau in South Kazakhstan, the Yixian formation in Liaoning, North China, as well as the Jiulongshan formation and further fossil sites in Mongolia. In North America there are only a few sites with fossil records of insects from the Jurassic, namely the shell limestone deposits in the Hartford basin, the Deerfield basin and the Newark basin.
The Cretaceous saw the fragmenting of the southern landmass, with the opening of the southern Atlantic Ocean and the isolation of New Zealand, while South America, Antarctica, and Australia grew more distant. The diversity of Cupedidae and Archostemata decreased considerably. Predatory ground beetles (Carabidae) and rove beetles (Staphylinidae) began to distribute into different patterns; the Carabidae predominantly occurred in the warm regions, while the Staphylinidae and click beetles (Elateridae) preferred temperate climates. Likewise, predatory species of Cleroidea and Cucujoidea hunted their prey under the bark of trees together with the jewel beetles (Buprestidae). The diversity of jewel beetles increased rapidly, as they were the primary consumers of wood, while longhorn beetles (Cerambycidae) were rather rare: their diversity increased only towards the end of the Upper Cretaceous. The first coprophagous beetles are from the Upper Cretaceous and may have lived on the excrement of herbivorous dinosaurs. The first species where both larvae and adults are adapted to an aquatic lifestyle are found. Whirligig beetles (Gyrinidae) were moderately diverse, although other early beetles (e.g. Dytiscidae) were less, with the most widespread being the species of Coptoclavidae, which preyed on aquatic fly larvae.
Many fossil sites worldwide contain beetles from the Cretaceous. Most are in Europe and Asia and belong to the temperate climate zone during the Cretaceous. Lower Cretaceous sites include the Crato fossil beds in the Araripe basin in the Ceará, North Brazil, as well as overlying Santana formation; the latter was near the equator at that time. In Spain, important sites are near Montsec and Las Hoyas. In Australia, the Koonwarra fossil beds of the Korumburra group, South Gippsland, Victoria, are noteworthy. Major sites from the Upper Cretaceous include Kzyl-Dzhar in South Kazakhstan and Arkagala in Russia.
Beetle fossils are abundant in the Cenozoic; by the Quaternary (up to 1.6 mya), fossil species are identical to living ones, while from the Late Miocene (5.7 mya) the fossils are still so close to modern forms that they are most likely the ancestors of living species. The large oscillations in climate during the Quaternary caused beetles to change their geographic distributions so much that current location gives little clue to the biogeographical history of a species. It is evident that geographic isolation of populations must often have been broken as insects moved under the influence of changing climate, causing mixing of gene pools, rapid evolution, and extinctions, especially in middle latitudes.
The very large number of beetle species poses special problems for classification. Some families contain tens of thousands of species, and need to be divided into subfamilies and tribes. This immense number led the evolutionary biologist J. B. S. Haldane to quip, when some theologians asked him what could be inferred about the mind of the Creator from the works of His Creation, "An inordinate fondness for beetles". Polyphaga is the largest suborder, containing more than 300,000 described species in more than 170 families, including rove beetles (Staphylinidae), scarab beetles (Scarabaeidae), blister beetles (Meloidae), stag beetles (Lucanidae) and true weevils (Curculionidae). These polyphagan beetle groups can be identified by the presence of cervical sclerites (hardened parts of the head used as points of attachment for muscles) absent in the other suborders. Adephaga contains about 10 families of largely predatory beetles, includes ground beetles (Carabidae), water beetles (Dytiscidae) and whirligig beetles (Gyrinidae). In these insects, the testes are tubular and the first abdominal sternum (a plate of the exoskeleton) is divided by the hind coxae (the basal joints of the beetle's legs). Archostemata contains four families of mainly wood-eating beetles, including reticulated beetles (Cupedidae) and the telephone-pole beetle. The Archostemata have an exposed plate called the metatrochantin in front of the basal segment or coxa of the hind leg. Myxophaga contains about 65 described species in four families, mostly very small, including Hydroscaphidae and the genus Sphaerius. The myxophagan beetles are small and mostly alga-feeders. Their mouthparts are characteristic in lacking galeae and having a mobile tooth on their left mandible.
The consistency of beetle morphology, in particular their possession of elytra, has long suggested that Coleoptera is monophyletic, though there have been doubts about the arrangement of the suborders, namely the Adephaga, Archostemata, Myxophaga and Polyphaga within that clade. The twisted-wing parasites, Strepsiptera, are thought to be a sister group to the beetles, having split from them in the Early Permian.
Molecular phylogenetic analysis confirms that the Coleoptera are monophyletic. Duane McKenna et al. (2015) used eight nuclear genes for 367 species from 172 of 183 Coleopteran families. They split the Adephaga into 2 clades, Hydradephaga and Geadephaga, broke up the Cucujoidea into 3 clades, and placed the Lymexyloidea within the Tenebrionoidea. The Polyphaga appear to date from the Triassic. Most extant beetle families appear to have arisen in the Cretaceous. The cladogram is based on McKenna (2015). The number of species in each group (mainly superfamilies) is shown in parentheses, and boldface if over 10,000. English names are given where possible. Dates of origin of major groups are shown in italics in millions of years ago (mya).
Beetles are generally characterized by a particularly hard exoskeleton and hard forewings (elytra) not usable for flying. Almost all beetles have mandibulate mouthparts with the mandibles mobile in a horizontal plane. The mouthparts are rarely suctorial and are sometimes reduced and the maxillae always bear palps. The antennae usually have 11 or fewer segments except in some groups like the Rhipiceridae and Cerambycidae. The coxae of the legs are usually located recessed within a coxal cavity. The genitalic structures are telescoped into the last abdominal segment in all extant beetles. Unlike the adults, beetle larvae can often be confused with larvae of other endopterygote groups. The beetle's exoskeleton is made up of numerous plates, called sclerites, separated by thin sutures. This design provides armored defenses while maintaining flexibility. The general anatomy of a beetle is quite uniform, although specific organs and appendages vary greatly in appearance and function between the many families in the order. Like all insects, beetles' bodies are divided into three sections: the head, the thorax, and the abdomen. Because there are so many species, identification is quite difficult, and relies on attributes including the shape of the antennae, the tarsal formulae[a] and shapes of these small segments on the legs, the mouthparts, and the ventral plates (sterna, pleura, coxae). In many species accurate identification can only be made by examination of the unique male genitalic structures.
The head, having mouthparts projecting forward or sometimes downturned, is usually heavily sclerotized and is sometimes very large. The eyes are compound and may display remarkable adaptability, as in the case of the aquatic whirligig beetles (Gyrinidae), where they are split to allow a view both above and below the waterline. Longhorn beetles (Cerambycidae) and weevils have divided eyes, while many have eyes that are notched, and a few have ocelli, small, simple eyes usually farther back on the head (on the vertex); these are more common in larvae than in adults. Ocelli are found in the adult carpet beetle (Dermestidae), some rove beetles (Omaliinae), and the Derodontidae.
Beetle antennae are primarily organs of sensory perception and can detect motion, odour and chemical substances, but may also be used to physically feel a beetle's environment. Beetle families may use antennae in different ways. For example, when moving quickly, tiger beetles may not be able to see very well and instead hold their antennae rigidly in front of them in order to avoid obstacles. Certain Cerambycidae use antennae to balance, and blister beetles may use them for grasping. Some aquatic beetle species may use antennae for gathering air and passing it under the body whilst submerged. Equally, some families use antennae during mating, and a few species use them for defence. In the cerambycid Onychocerus albitarsis, the antennae have venom injecting structures used in defence. Antennae vary greatly in form, sometimes between the sexes, but are often similar within any given family. Antennae may be clubbed, threadlike, angled, shaped like a string of beads, comb-like (either on one side or both, bipectinate), or toothed. The physical variation of antennae is important for the identification of many beetle groups. The Curculionidae have elbowed or geniculate antennae. Feather like flabellate antennae are a restricted form found in the Rhipiceridae and a few other families. The Silphidae have a capitate antennae with a spherical head at the tip. The Scarabaeidae typically have lamellate antennae with the terminal segments extended into long flat structures stacked together. The Carabidae typically have thread-like antennae. The antennae arises between the eye and the mandibles and in the Tenebrionidae, the antennae rise in front of a notch that breaks the usually circular outline of the compound eye. They are segmented and usually consist of 11 parts, the first part is called the scape and the second part is the pedicel. The other segments are jointly called the flagellum.
Beetles have mouthparts like those of grasshoppers. The mandibles appear as large pincers on the front of some beetles. The mandibles are a pair of hard, often tooth-like structures that move horizontally to grasp, crush, or cut food or enemies (see defence, below). Two pairs of finger-like appendages, the maxillary and labial palpi, are found around the mouth in most beetles, serving to move food into the mouth. In many species, the mandibles are sexually dimorphic, with those of the males enlarged enormously compared with those of females of the same species.
The thorax is segmented into the two discernible parts, the pro- and pterothorax. The pterothorax is the fused meso- and metathorax, which are commonly separated in other insect species, although flexibly articulate from the prothorax. When viewed from below, the thorax is that part from which all three pairs of legs and both pairs of wings arise. The abdomen is everything posterior to the thorax. When viewed from above, most beetles appear to have three clear sections, but this is deceptive: on the beetle's upper surface, the middle section is a hard plate called the pronotum, which is only the front part of the thorax; the back part of the thorax is concealed by the beetle's wings. This further segmentation is usually best seen on the abdomen.
The multisegmented legs end in two to five small segments called tarsi. Like many other insect orders, beetles have claws, usually one pair, on the end of the last tarsal segment of each leg. While most beetles use their legs for walking, legs have been variously adapted for other uses. Aquatic beetles including the Dytiscidae (diving beetles), Haliplidae, and many species of Hydrophilidae, the legs, often the last pair, are modified for swimming, typically with rows of long hairs. Male diving beetles have suctorial cups on their forelegs that they use to grasp females. Other beetles have fossorial legs widened and often spined for digging. Species with such adaptations are found among the scarabs, ground beetles, and clown beetles (Histeridae). The hind legs of some beetles, such as flea beetles (within Chrysomelidae) and flea weevils (within Curculionidae), have enlarged femurs that help them leap.
The forewings of beetles are not used for flight, but form elytra which cover the hind part of the body and protect the hindwings. The elytra are usually hard shell-like structures which must be raised to allow the hind wings to move for flight. However, in the soldier beetles (Cantharidae), the elytra are soft, earning this family the name of leatherwings. Other soft wing beetles include the net-winged beetle Calopteron discrepans, which has brittle wings that rupture easily in order to release chemicals for defence.
Beetles' flight wings are crossed with veins and are folded after landing, often along these veins, and stored below the elytra. A fold (jugum) of the membrane at the base of each wing is characteristic. Some beetles have lost the ability to fly. These include some ground beetles (Carabidae) and some true weevils (Curculionidae), as well as desert- and cave-dwelling species of other families. Many have the two elytra fused together, forming a solid shield over the abdomen. In a few families, both the ability to fly and the elytra have been lost, as in the glow-worms (Phengodidae), where the females resemble larvae throughout their lives. The presence of elytra and wings does not always indicate that the beetle will fly. For example, the tansy beetle walks between habitats despite being physically capable of flight.
The abdomen is the section behind the metathorax, made up of a series of rings, each with a hole for breathing and respiration, called a spiracle, composing three different segmented sclerites: the tergum, pleura, and the sternum. The tergum in almost all species is membranous, or usually soft and concealed by the wings and elytra when not in flight. The pleura are usually small or hidden in some species, with each pleuron having a single spiracle. The sternum is the most widely visible part of the abdomen, being a more or less sclerotized segment. The abdomen itself does not have any appendages, but some (for example, Mordellidae) have articulating sternal lobes.
Anatomy and physiologyEdit
The digestive system of beetles is primarily adapted for a herbivorous diet. Digestion takes place mostly in the anterior midgut, although in predatory groups like the Carabidae, most digestion occurs in the crop by means of midgut enzymes. In the Elateridae, the larvae are liquid feeders that extraorally digest their food by secreting enzymes. The alimentary canal basically consists of a short, narrow pharynx, a widened expansion, the crop, and a poorly developed gizzard. This is followed by the midgut, that varies in dimensions between species, with a large amount of cecum, and the hindgut, with varying lengths. There are typically four to six Malpighian tubules.
The nervous system in beetles contains all the types found in insects, varying between different species, from three thoracic and seven or eight abdominal ganglia which can be distinguished to that in which all the thoracic and abdominal ganglia are fused to form a composite structure.
Like most insects, beetles inhale air, for the oxygen it contains, and exhale carbon dioxide, via a tracheal system. Air enters the body through spiracles, and circulates within the haemocoel in a system of tracheae and tracheoles, through whose walls the gases can diffuse.
Diving beetles, such as the Dytiscidae, carry a bubble of air with them when they dive. Such a bubble may be contained under the elytra or against the body by specialized hydrophobic hairs. The bubble covers at least some of the spiracles, permitting air to enter the tracheae. The function of the bubble is not only to contain a store of air, but to act as a physical gill. The air that it traps is in contact with oxygenated water, so as the animal's consumption depletes the oxygen in the bubble, more oxygen can diffuse in to replenish it. Carbon dioxide is more soluble in water than either oxygen or nitrogen, so it readily diffuses out faster than in. Nitrogen is the most plentiful gas in the bubble, and the least soluble, so it constitutes a relatively static component of the bubble and acts as a stable medium for respiratory gases to accumulate in and pass through. Occasional visits to the surface are sufficient for the beetle to re-establish the constitution of the bubble.
Like other insects, beetles have open circulatory systems, based on hemolymph rather than blood. As in other insects, a segmented tube-like heart is attached to the dorsal wall of the hemocoel. It has paired inlets or ostia at intervals down its length, and circulates the hemolymph from the main cavity of the haemocoel and out through the anterior cavity in the head.
Different glands are specialized for different pheromones to attract mates. Pheromones from species of Rutelinae are produced from epithelial cells lining the inner surface of the apical abdominal segments; amino acid-based pheromones of Melolonthinae are produced from eversible glands on the abdominal apex. Other species produce different types of pheromones. Dermestids produce esters, and species of Elateridae produce fatty acid-derived aldehydes and acetates. To attract a mate, fireflies (Lampyridae) use modified fat body cells with transparent surfaces backed with reflective uric acid crystals to produce light by bioluminescence. Light production is highly efficient, by oxidation of luciferin catalyzed by enzymes (luciferases) in the presence of adenosine triphosphate (ATP) and oxygen, producing oxyluciferin, carbon dioxide, and light.
Tympanal organs or hearing organs consist of a membrane (tympanum) stretched across a frame backed by an air sac and associated sensory neurons, are found in two families. Several species of the genus Cicindela (Carabidae) have hearing organs on the dorsal surfaces of their first abdominal segments beneath the wings; two tribes in the Dynastinae (within the Scarabaeidae) have hearing organs just beneath their pronotal shields or neck membranes. Both families are sensitive to ultrasonic frequencies, with strong evidence indicating they function to detect the presence of bats by their ultrasonic echolocation.
Reproduction and developmentEdit
Beetles are members of the superorder Endopterygota, and accordingly most of them undergo complete metamorphosis. The typical form of metamorphosis in beetles passes through four main stages: the egg, the larva, the pupa, and the imago or adult. The larvae are commonly called grubs and the pupa sometimes is called the chrysalis. In some species, the pupa may be enclosed in a cocoon constructed by the larva towards the end of its final instar. Some beetles, such as typical members of the families Meloidae and Rhipiphoridae, go further, undergoing hypermetamorphosis in which the first instar takes the form of a triungulin.
Beetles may display extremely intricate behavior when mating. Pheromone communication is often important in the location of a mate.
Different species use different chemicals for their pheromones. Some scarab beetles (for example, Rutelinae) utilize pheromones derived from fatty acid synthesis, while other scarab beetles use amino acids and terpenoid compounds (for example, Melolonthinae). Another way beetles find mates is seen in the fireflies (Lampyridae) which are bioluminescent, with abdominal light-producing organs. The males and females engage in a complex dialogue before mating; each species has a unique combination of flight patterns, duration, composition, and intensity of the light produced.
Before mating, males and females may engage in various forms of behavior. They may stridulate, or vibrate the objects they are on. In some species (for example, Meloidae), the male climbs onto the dorsum of the female and strokes his antennae on her head, palps, and antennae. In the genus Eupompha, the male draws his antennae along his longitudinal vertex. They may not mate at all if they do not perform the precopulatory ritual. This mating behaviour may be different amongst dispersed populations of the same species. For example, the mating of a Russian population of tansy beetle (Chysolina graminis) is preceded by an elaborate ritual involving the male tapping the female's eyes, pronotum and antennae with its antennae, which is not evident in the population of this species in the United Kingdom.
Competition can play a part in the mating rituals of species such as burying beetles (Nicrophorus), the insects fighting to determine which can mate. Many male beetles are territorial and fiercely defend their territories from intruding males. In such species, the male often has horns on the head or thorax, making its body length greater than that of a female. Copulation is generally quick, but in some cases lasts for several hours. During copulation, sperm cells are transferred to the female to fertilize the egg.
Essentially all beetles lay eggs, though some myrmecophilous Aleocharinae and some Chrysomelinae which live in mountains or the subarctic are ovoviviparous, laying eggs which hatch almost immediately. Beetle eggs generally have smooth surfaces and are soft, though the Cupedidae have hard eggs. Eggs vary widely between species: the eggs tend to be small in species with many instars (larval stages), and in those that lay large numbers of eggs. A female may lay from several dozen to several thousand eggs during her lifetime, depending on the extent of parental care. This ranges from the simple laying of eggs under a leaf, to the parental care provided by scarab beetles, which house, feed and protect their young. The Attelabidae roll leaves and lay their eggs inside the roll for protection.
The larva is usually the principal feeding stage of the beetle life cycle. Larvae tend to feed voraciously once they emerge from their eggs. Some feed externally on plants, such as those of certain leaf beetles, while others feed within their food sources. Examples of internal feeders are most Buprestidae and longhorn beetles. The larvae of many beetle families are predatory like the adults (ground beetles, ladybirds, rove beetles). The larval period varies between species, but can be as long as several years. The larvae of skin beetles undergo a degree of reversed development when starved, and later grow back to the previously attained level of maturity. The cycle can be repeated many times (see Biological immortality). Larval morphology is highly varied amongst species, with well-developed and sclerotized heads, distinguishable thoracic and abdominal segments (usually the tenth, though sometimes the eighth or ninth).
Beetle larvae can be differentiated from other insect larvae by their hardened, often darkened heads, the presence of chewing mouthparts, and spiracles along the sides of their bodies. Like adult beetles, the larvae are varied in appearance, particularly between beetle families. Beetles with somewhat flattened, highly mobile larvae include the ground beetles and rove beetles; their larvae are described as campodeiform. Some beetle larvae resemble hardened worms with dark head capsules and minute legs. These are elateriform larvae, and are found in the click beetle (Elateridae) and darkling beetle (Tenebrionidae) families. Some elateriform larvae of click beetles are known as wireworms. Beetles in the Scarabaeoidea have short, thick larvae described as scarabaeiform, more commonly known as grubs.
All beetle larvae go through several instars, which are the developmental stages between each moult. In many species, the larvae simply increase in size with each successive instar as more food is consumed. In some cases, however, more dramatic changes occur. Among certain beetle families or genera, particularly those that exhibit parasitic lifestyles, the first instar (the planidium) is highly mobile to search out a host, while the following instars are more sedentary and remain on or within their host. This is known as hypermetamorphosis; it occurs in the Meloidae, Micromalthidae, and Ripiphoridae. The blister beetle Epicauta vittata (Meloidae), for example, has three distinct larval stages. Its first stage, the triungulin, has longer legs to go in search of the eggs of grasshoppers. After feeding for a week it moults to the second stage, called the caraboid stage, which resembles the larva of a carabid beetle. In another week it moults and assumes the appearance of a scarabaeid larva – the scarabaeidoid stage. Its penultimate larval stage is the pseudo-pupa or the coarcate larva, which will overwinter and pupate until the next spring.
The larval period can vary widely. A fungus feeding staphylinid Phanerota fasciata undergoes three moults in 3.2 days at room temperature while Anisotoma sp. (Leiodidae) completes its larval stage in the fruiting body of slime mold in 2 days and possibly represents the fastest growing beetles. Dermestid beetles, Trogoderma inclusum can remain in an extended larval state under unfavourable conditions, even reducing their size between moults. A larva is reported to have survived for 3.5 years in an enclosed container.
Pupa and adultEdit
As with all endopterygotes, beetle larvae pupate, and from these pupae emerge fully formed, sexually mature adult beetles, or imagos. Pupae never have mandibles (they are adecticous). In most pupae, the appendages are not attached to the body and are said to be exarate; in a few beetles (Staphylinidae, Ptiliidae etc.) the appendages are fused with the body (termed as obtect pupae).
Adults have extremely variable lifespans, from weeks to years, depending on the species. Some wood-boring beetles can have extremely long life-cycles. It is believed that when furniture or house timbers are infested by beetle larvae, the timber already contained the larvae when it was first sawn up. A birch bookcase 40 years old released adult Eburia quadrigeminata (Cerambycidae), while Buprestis aurulenta and other Buprestidae have been documented as emerging as much as 51 years after manufacture of wooden items.
The elytra allow beetles to both fly and move through confined spaces, doing so by folding the delicate wings under the elytra while not flying, and folding their wings out just before take off. The unfolding and folding of the wings is operated by muscles attached to the wing base; as long as the tension on the radial and cubital veins remains, the wings remain straight. In some day-flying species (for example, Buprestidae, Scarabaeidae), flight does not include large amounts of lifting of the elytra, having the metathorac wings extended under the lateral elytra margins. The altitude reached by beetles in flight varies. One study investigating the flight altitude of the ladybird species Coccinella septempunctata and Harmonia axyridis using radar showed that, whilst the majority in flight over a single location were at 150–195 m above ground level, some reached altitudes of over 1100 m.
Many rove beetles have greatly reduced elytra, and while they are capable of flight, they most often move on the ground: their soft bodies and strong abdominal muscles make them flexible, easily able to wriggle into small cracks.
Aquatic beetles use several techniques for retaining air beneath the water's surface. Diving beetles (Dytiscidae) hold air between the abdomen and the elytra when diving. Hydrophilidae have hairs on their under surface that retain a layer of air against their bodies. Adult crawling water beetles use both their elytra and their hind coxae (the basal segment of the back legs) in air retention, while whirligig beetles simply carry an air bubble down with them whenever they dive.
Beetles have a variety of ways to communicate, including the use of pheromones. The mountain pine beetle emits a pheromone to attract other beetles to a tree. The mass of beetles are able to overcome the chemical defenses of the tree. After the tree's defenses have been exhausted, the beetles emit an anti-aggregation pheromone. The species can stridulate to communicate.
Parental care is found in a few species of beetle, perhaps for protection against adverse conditions and predators. The rove beetle Bledius spectabilis lives in salt marshes, so the eggs and larvae are endangered by the rising tide. The maternal beetle patrols the eggs and larvae, burrowing to keep them from flooding and asphyxiating, and protects them from the predatory carabid beetle Dicheirotrichus gustavi and from the parasitoidal wasp Barycnemis blediator, which kills some 15% of the larvae.
Some dung beetles provide parental care, collecting herbivore dung and laying eggs within that food supply, an instance of mass provisioning. Some species do not leave after this stage, but remain to safeguard their offspring.
Eusociality involves cooperative brood care (including brood care of offspring from other individuals), overlapping generations within a colony of adults, and a division of labour into reproductive and non-reproductive groups. Few organisms outside Hymenoptera exhibit this behavior; the only beetle to do so is the weevil Austroplatypus incompertus. This Australian species lives in horizontal networks of tunnels, in the heartwood of Eucalyptus trees. It is one of more than 300 species of wood-boring Ambrosia beetles which distribute the spores of ambrosia fungi. The fungi grow in the beetles' tunnels, providing food for the beetles and their larvae; female offspring remain in the tunnels and maintain the fungal growth, probably never reproducing. Cooperative brood care is also found in the bess beetles (Passalidae) where the larvae feed on the semi-digested faeces of the adults.
Beetles are able to exploit a wide diversity of food sources available in their many habitats. Some are omnivores, eating both plants and animals. Other beetles are highly specialized in their diet. Many species of leaf beetles, longhorn beetles, and weevils are very host-specific, feeding on only a single species of plant. Ground beetles and rove beetles (Staphylinidae), among others, are primarily carnivorous and catch and consume many other arthropods and small prey, such as earthworms and snails. While most predatory beetles are generalists, a few species have more specific prey requirements or preferences.
Decaying organic matter is a primary diet for many species. This can range from dung, which is consumed by coprophagous species (such as certain scarab beetles in the Scarabaeidae), to dead animals, which are eaten by necrophagous species (such as the carrion beetles, Silphidae). Some beetles found in dung and carrion are in fact predatory. These include members of the Histeridae and Silphidae, preying on the larvae of coprophagous and necrophagous insects. Many beetles feed under bark, some feed on wood while others feed on fungi growing on wood or leaf-litter. Some beetles have special mycangia, structures for the transport of fungal spores.
Beetles, both adults and larvae, are the prey of many animal predators including mammals from bats to rodents, birds, lizards, amphibians, fishes, dragonflies, robberflies, reduviid bugs, ants, other beetles, and spiders. Beetles use a variety of anti-predator adaptations to defend themselves. These include camouflage and mimicry against predators that hunt by sight, toxicity, and defensive behaviour.
Camouflage is common and widespread among beetle families, especially those that feed on wood or vegetation, such as leaf beetles (Chrysomelidae, which are often green) and weevils. In some species, sculpturing or various coloured scales or hairs cause beetles such as the avocado weevil Heilipus apiatus to resemble bird dung or other inedible objects. Many beetles that live in sandy environments blend in with the coloration of that substrate.
Mimicry and aposematismEdit
Some longhorn beetles (Cerambycidae) are effective Batesian mimics of wasps. Beetles may combine coloration with behavioural mimicry, acting like the wasps they already closely resemble. Many other beetles, including ladybirds, blister beetles, and lycid beetles secrete distasteful or toxic substances to make them unpalatable or poisonous, and are often aposematic, where bright or contrasting coloration warn off predators; many beetles and other insects mimic these chemically protected species.
Chemical defense is important in some species, usually being advertised by bright aposematic colours. Some Tenebrionidae use their posture for releasing noxious chemicals to warn off predators. Chemical defences may serve purposes other than just protection from vertebrates, such as protection from a wide range of microbes. Some species sequester chemicals from the plants they feed on, incorporating them into their own defenses.
Other species have special glands to produce deterrent chemicals. The defensive glands of carabid ground beetles produce a variety of hydrocarbons, aldehydes, phenols, quinones, esters, and acids released from an opening at the end of the abdomen. African carabid beetles (for example, Anthia and Thermophilum – Thermophilum is sometimes included within Anthia) employ the same chemicals as ants: formic acid. Bombardier beetles have well-developed pygidial glands that empty from the sides of the intersegment membranes between the seventh and eighth abdominal segments. The gland is made of two containing chambers, one for hydroquinones and hydrogen peroxide, the other holding hydrogen peroxide and catalase enzymes. These chemicals mix and result in an explosive ejection, reaching a temperature of around 100 °C (212 °F), with the breakdown of hydroquinone to hydrogen, oxygen, and quinone. The oxygen propels the noxious chemical spray as a jet that can be aimed accurately at predators.
Large ground-dwelling beetles such as Carabidae, the rhinoceros beetle and the longhorn beetles defend themselves using strong mandibles, or heavily sclerotised (armored) spines or horns to deter or fight off predators. Many species of weevil that feed out in the open on leaves of plants react to attack by employing a drop-off reflex. Some combine it with thanatosis, in which they close up their appendages and "play dead". The click beetles (Elateridae) can suddenly catapult themselves out of danger by releasing the energy stored by a click mechanism, which consists of a stout spine on the prosternum and a matching groove in the mesosternum.
A few species of beetles are ectoparasitic on mammals. One such species, Platypsyllus castoris, parasitises beavers (Castor spp.). This beetle lives as a parasite both as a larva and as an adult, feeding on epidermal tissue and possibly on skin secretions and wound exudates. They are strikingly flattened dorsoventrally, no doubt as an adaptation for slipping between the beavers' hairs. They are wingless and eyeless, as are many other ectoparasites. Others are kleptoparasites of other invertebrates, such as the small hive beetle (Aethina tumida) that infests honey bee nests, while many species are parasitic inquilines or commensal in the nests of ants.
Beetle-pollinated flowers are usually large, greenish or off-white in color, and heavily scented. Scents may be spicy, fruity, or similar to decaying organic material. Beetles were most likely the first insects to pollinate flowers. Most beetle-pollinated flowers are flattened or dish-shaped, with pollen easily accessible, although they may include traps to keep the beetle longer. The plants' ovaries are usually well protected from the biting mouthparts of their pollinators. The beetle families that habitually pollinate flowers are the Buprestidae, Cantharidae, Carambycidae, Cleridae, Dermestidae, Lycidae, Melyridae, Mordellidae, Nitidulidae and Scarabeidae. Beetles may be particularly important in some parts of the world such as semiarid areas of southern Africa and southern California and the montane grasslands of KwaZulu-Natal in South Africa.
Mutualism is well known in a few beetles, such as the ambrosia beetle, which partners with fungi to digest the wood of dead trees. The beetles excavate tunnels in dead trees in which they cultivate fungal gardens, their sole source of nutrition. After landing on a suitable tree, an ambrosia beetle excavates a tunnel in which it releases spores of its fungal symbiont. The fungus penetrates the plant's xylem tissue, digests it, and concentrates the nutrients on and near the surface of the beetle gallery, so the weevils and the fungus both benefit. The beetles cannot eat the wood due to toxins, and uses its relationship with fungi to help overcome the defenses of its host tree in order to provide nutrition for their larvae. Chemically mediated by a bacterially produced polyunsaturated peroxide, this mutualistic relationship between the beetle and the fungus is coevolved.
Tolerance of extreme environmentsEdit
About 90% of beetle species enter a period of adult diapause, a quiet phase with reduced metabolism to tide unfavourable environmental conditions. Adult diapause is the most common form of diapause in Coleoptera. To endure the period without food (often lasting many months) adults prepare by accumulating reserves of lipids, glycogen, proteins and other substances needed for resistance to future hazardous changes of environmental conditions. This diapause is induced by signals heralding the arrival of the unfavourable season; usually the cue is photoperiodic. Short (decreasing) day length serves as a signal of approaching winter and induces winter diapause (hibernation). A study of hibernation in the Arctic beetle Pterostichus brevicorni showed that the body fat levels of adults were highest in autumn with the alimentary canal filled with food, but empty by the end of January. This loss of body fat was a gradual process, occurring in combination with dehydration.
All insects are poikilothermic, so the ability of a few beetles to live in extreme environments depends on their resilience to unusually high or low temperatures. The bark beetle Pityogenes chalcographus can survive −39°C whilst overwintering beneath tree bark; the Alaskan beetle Cucujus clavipes puniceus is able to withstand −58°C; its larvae may survive −100°C. At these low temperatures, the formation of ice crystals in internal fluids is the biggest threat to survival to beetles, but this is prevented through the production of antifreeze proteins that stop water molecules from grouping together. The low temperatures experienced by Cucujus clavipes can be survived through their deliberate dehydration in conjunction with the antifreeze proteins. This concentrates the antifreezes several fold. The hemolymph of the mealworm beetle Tenebrio molitor contains several antifreeze proteins. The Alaskan beetle Upis ceramboides can survive −60 °C: its cryoprotectants are xylomannan, a molecule consisting of a sugar bound to a fatty acid, and the sugar-alcohol, threitol.
Conversely, desert dwelling beetles are adapted to tolerate high temperatures. For example, the Tenebrionid beetle Onymacris rugatipennis can withstand 50°C. Tiger beetles in hot, sandy areas are often whitish (for example, Habroscelimorpha dorsalis), to reflect more heat than a darker colour would. These beetles also exhibits behavioural adaptions to tolerate the heat: they are able to stand erect on their tarsi to hold their bodies away from the hot ground, seek shade, and turn to face the sun so that only the front parts of their heads are directly exposed.
The fogstand beetle of the Namib Desert, Stenocara gracilipes, is able to collect water from fog, as its elytra have a textured surface combining hydrophilic (water-loving) bumps and waxy, hydrophobic troughs. The beetle faces the early morning breeze, holding up its abdomen; droplets condense on the elytra and run along ridges towards their mouthparts. Similar adaptations are found in several other Namib desert beetles such as Onymacris unguicularis.
Some terrestrial beetles that exploit shoreline and floodplain habitats have physiological adaptations for surviving floods. In the event of flooding, adult beetles may be mobile enough to move away from flooding, but larvae and pupa often cannot. Adults of Cicindela togata are unable to survive immersion in water, but larvae are able to survive a prolonged period, up to 6 days, of anoxia during floods. Anoxia tolerance in the larvae may have been sustained by switching to anaerobic metabolic pathways or by reducing metabolic rate. Anoxia tolerance in the adult Carabid beetle Pelophilia borealis was tested in laboratory conditions and it was found that they could survive a continuous period of up to 127 days in an atmosphere of 99.9% nitrogen at 0 °C.
Many beetle species undertake annual mass movements which are termed as migrations. These include the pollen beetle Meligethes aeneus and many species of coccinellids. These mass movements may also be opportunistic, in search of food, rather than seasonal. A 2008 study of an unusually large outbreak of Mountain Pine Beetle (Dendroctonus ponderosae) in British Columbia found that beetles were capable of flying 30–110 km per day in densities of up to 18, 600 beetles per hectare.
Relationship to humansEdit
In ancient culturesEdit
Several species of dung beetle, especially the sacred scarab, Scarabaeus sacer, were revered in Ancient Egypt. The hieroglyphic image of the beetle may have had existential, fictional, or ontologic significance. Images of the scarab in bone, ivory, stone, Egyptian faience, and precious metals are known from the Sixth Dynasty and up to the period of Roman rule. The scarab was of prime significance in the funerary cult of ancient Egypt. The scarab was linked to Khepri, the god of the rising sun, from the supposed resemblance of the rolling of the dung ball by the beetle to the rolling of the sun by the god. Some of ancient Egypt's neighbors adopted the scarab motif for seals of varying types. The best-known of these are the Judean LMLK seals, where eight of 21 designs contained scarab beetles, which were used exclusively to stamp impressions on storage jars during the reign of Hezekiah. Beetles are mentioned as a symbol of the sun, as in ancient Egypt, in Plutarch's 1st century Moralia. The Greek Magical Papyri of the 2nd century BC to the 5th century AD describe scarabs as an ingredient in a spell.
Pliny the Elder discusses beetles in his Natural History, describing the stag beetle: "Some insects, for the preservation of their wings, are covered with a erust (elytra) – the beetle, for instance, the wing of which is peculiarly fine and frail. To these insects a sting has been denied by Nature; but in one large kind we find horns of a remarkable length, two-pronged at the extremities, and forming pincers, which the animal closes when it is its intention to bite." The stag beetle is recorded in a Greek myth by Nicander and recalled by Antoninus Liberalis in which Cerambus[b] is turned into a beetle: "He can be seen on trunks and has hook-teeth, ever moving his jaws together. He is black, long and has hard wings like a great dung beetle". The story concludes with the comment that the beetles were used as toys by young boys, and that the head was removed and worn as a pendant.
About 75% of beetle species are phytophagous in both the larval and adult stages. Many feed on economically important plants and stored plant products, including trees, cereals, tobacco, and dried fruits. Some, such as the boll weevil, which feeds on cotton buds and flowers, can cause extremely serious damage to agriculture. The boll weevil crossed the Rio Grande near Brownsville, Texas, to enter the United States from Mexico around 1892, and had reached southeastern Alabama by 1915. By the mid-1920s, it had entered all cotton-growing regions in the US, traveling 40 to 160 miles (60–260 km) per year. It remains the most destructive cotton pest in North America. Mississippi State University has estimated, since the boll weevil entered the United States, it has cost cotton producers about $13 billion, and in recent times about $300 million per year.
The bark beetle, elm leaf beetle and the Asian longhorned beetle (Anoplophora glabripennis) are among the species that attack elm trees. Bark beetles (Scolytidae) carry Dutch elm disease as they move from infected breeding sites to healthy trees. The disease has devastated elm trees across Europe and North America.
Some species of beetle have evolved immunity to insecticides. For example, the Colorado potato beetle, Leptinotarsa decemlineata, is a destructive pest of potato plants. Its hosts include other members of the Solanaceae, such as nightshade, tomato, eggplant and capsicum, as well as the potato. Different populations have between them developed resistance to all major classes of insecticide. The Colorado potato beetle was evaluated as a tool of entomological warfare during World War II, the idea being to use the beetle and its larvae to damage the crops of enemy nations. Germany tested its Colorado potato beetle weaponisation program south of Frankfurt, releasing 54,000 beetles.
The death watch beetle, Xestobium rufovillosum (Anobiidae), is a serious pest of older wooden buildings in Europe. It attacks hardwoods such as oak and chestnut, always where some fungal decay has taken or is taking place. The actual introduction of the pest into buildings is thought to take place at the time of construction.
Other pest include the coconut hispine beetle, Brontispa longissima, which feeds on young leaves, seedlings and mature coconut trees, causing serious economic damage in the Philippines. The mountain pine beetle is a destructive pest of mature or weakened lodgepole pine, sometimes affecting large areas of Canada.
As beneficial resourcesEdit
Beetles can be beneficial to human economics by controlling the populations of pests. The larvae and adults of some species of lady beetles (Coccinellidae) feed on aphids that are pests. Other lady beetles feed on scale insects, whitefly and mealybugs. If normal food sources are scarce, they may feed on small caterpillars, young plant bugs, or honeydew and nectar. Ground beetles (Carabidae) are common predators of many insect pests, including fly eggs, caterpillars, and wireworms. Ground beetles can help to control weeds by eating their seeds in the soil, reducing the need for herbicides to protect crops. The effectiveness of some species in reducing certain plant populations has resulted in the deliberate introduction of beetles in order to control weeds. For example, the genus Zygogramma is native to North America but has been used to control Parthenium hysterophorus in India and Ambrosia artemisiifolia in Russia.
Dung beetles (Scarabidae) have been successfully used to reduce the populations of pestilent flies, such as Musca vetustissima and Haematobia exigua which are serious pests of cattle in Australia. The beetles make the dung unavailable to breeding pests by quickly rolling and burying it in the soil, with the added effect of improving soil fertility, tilth, and nutrient cycling. The Australian Dung Beetle Project (1965–1985), introduced species of dung beetle to Australia from South Africa and Europe to reduce populations of Musca vetustissima, following successful trials of this technique in Hawaii. The American Institute of Biological Sciences reports that dung beetles save the United States cattle industry an estimated US$380 million annually through burying above-ground livestock feces.
The Dermestidae are often used in taxidermy and in the preparation of scientific specimens, to clean soft tissue from bones. Larvae feed on and remove cartilage along with other soft tissue.
Beetles are the most widely eaten insects, with about 344 species used as food, usually at the larval stage. The mealworm (the larva of the darkling beetle) and the rhinoceros beetle are among the species commonly eaten.
As biodiversity indicatorsEdit
Due to their habitat specificity, many species of beetles have been suggested as suitable as indicators, their presence, numbers, or absence providing a measure of habitat quality. Predatory beetles such as the tiger beetles (Cicindelidae) have found scientific use as an indicator taxon for measuring regional patterns of biodiversity. They are suitable for this as their taxonomy is stable; their life history is well described; they are large and simple to observe when visiting a site; they occur around the world in many habitats, with species specialised to particular habitats; and their occurrence by species accurately indicates other species, both vertebrate and invertebrate. According to the habitats, many other groups such as the rove beetles in human-modified habitats, dung beetles in savannas and saproxylic beetles in forests have been suggested as potential indicator species.
In art and adornmentEdit
Many beetles have beautiful and durable elytra that have been used as material in arts, with beetlewing the best example. Sometimes, they are incorporated into ritual objects for their religious significance. Whole beetles, either as-is or encased in clear plastic, are made into objects ranging from cheap souvenirs such as key chains to expensive fine-art jewellery. In parts of Mexico, beetles of the genus Zopherus are made into living brooches by attaching costume jewelry and golden chains, which is made possible by the incredibly hard elytra and sedentary habits of the genus.
Fighting beetles are used for entertainment and gambling. This sport exploits the territorial behavior and mating competition of certain species of large beetles. In the Chiang Mai district of northern Thailand, male Xylotrupes rhinoceros beetles are caught in the wild and trained for fighting. Females are held inside a log to stimulate the fighting males with their pheromones. These fights may be competitive and involve gambling both money and property. In South Korea the Dytiscidae species Cybister tripunctatus is used in a roulette-like game.
Beetles are sometimes used as instruments: the Onabasulu of Papua New Guinea historically used the weevil Rhynchophorus ferrugineus as a musical instrument by letting the human mouth serve as a variable resonance chamber for the wing vibrations of the live adult beetle.
In Japan the practice of keeping horned rhinoceros beetles (Dynastinae) and stag beetles (Lucanidae) is particularly popular amongst young boys. Such is the popularity in Japan that vending machines dispensing live beetles were developed in 1999, each holding up to 100 stag beetles.
As things to collectEdit
Beetle collecting became extremely popular in the Victorian era. The naturalist Alfred Russel Wallace collected (by his own count) a total of 83,200 beetles during the eight years described in his 1869 book The Malay Archipelago, including 2,000 species new to science.
As inspiration for technologiesEdit
Several coleopteran adaptations have attracted interest in biomimetics with possible commercial applications. The bombardier beetle's powerful repellent spray has inspired the development of a fine mist spray technology, claimed to have a low carbon impact compared to aerosol sprays. Moisture harvesting behavior by the Namib desert beetle (Stenocara gracilipes) has inspired a self-filling water bottle which utilises hydrophilic and hydrophobic materials to benefit people living in dry regions with no regular rainfall.
Technological adaptations have also utilised living beetles as cyborgs. For example, a Defense Advanced Research Projects Agency funded project implanted electrodes into adult male Rhinoceros beetles, allowing them to be remotely controlled via a radio receiver held on its back. Electrical signals delivered via the electrodes command the insect to take off, turn left or right, or hover in midflight. The research was intended to suggest proof-of-concept for surveillance purposes. Similar technology has been applied to the flower beetle Mecynorhina torquata to stimulate different walking gaits and lengths of a live beetle controllable by a human operator.
Since beetles form such a large part of the world's biodiversity, their conservation is important, and equally, loss of habitat and biodiversity is essentially certain to impact on beetles. Unfortunately, with exceptions for groups such as ladybirds and fireflies, beetles as a whole have a less positive image than other insect groups like the butterflies: many are indeed pests, and others arouse disgust. Many species of beetles have very specific habitats and long life cycles that make them vulnerable. Some species are highly threatened while others are already feared extinct. Island species tend to be more susceptible as in the case of Helictopleurus undatus of Madagascar which is thought to have gone extinct during the late 20th century. Conservationists have attempted to arouse a liking for beetles with flagship species like the stag beetle, Lucanus cervus, and tiger beetles (Cicindelidae). In Japan the Genji firefly, Luciola cruciata, is extremely popular, and in South Africa the Addo elephant dung beetle offers promise for broadening ecotourism beyond the big five tourist mammal species. Popular dislike of pest beetles, too, can be turned into public interest in insects, as can unusual ecological adaptations of species like the fairy shrimp hunting beetle, Cicinis bruchi.
- These count fore, mid, and hind leg tarsal segments, such as 5-5-4.
- The wood-gnawing longhorn beetle genus Cerambyx is named for him.
- The plate was labelled "Neocerambyx æneas, Cladognathus tarandus, Diurus furcellatus, Ectatorhinus Wallacei, Megacriodes Saundersii, Cyriopalpus Wallacei".
- Bouchard, P.; Bousquet, Y.; Davies, A.; Alonso-Zarazaga, M.; Lawrence, J.; Lyal, C.; Newton, A.; Reid, C.; Schmitt, M.; Ślipiński, A.; Smith, A. (2011). "Family-group names in Coleoptera (Insecta)". ZooKeys. 88 (88): 1–972. PMC . PMID 21594053. doi:10.3897/zookeys.88.807.
- Harper, Douglas. "Coleoptera". Online Etymology Dictionary.
- Harper, Douglas. "Beetle". Online Etymology Dictionary.
- "Beetle". Merriam-Webster Online Dictionary. Retrieved 20 February 2016.
- Harper, Douglas. "Chafer". Online Etymology Dictionary.
- Gilliott, Cedric (August 1995). Entomology (2 ed.). Springer-Verlag. p. 96. ISBN 0-306-44967-6.
- McHugh (2009)
- Rosenzweig, M. L. (1995). Species Diversity in Space and Time. Cambridge: Cambridge University Press. p. 2. ISBN 978-0-521-49952-1.
- Hunt, T.; Bergsten, J.; Levkanicova, Z.; Papadopoulou, A.; John, O. S.; Wild, R.; Hammond, P. M.; Ahrens, D.; Balke, M.; Caterino, M. S.; Gómez-Zurita, J.; Ribera, I; Barraclough, T. G.; Bocakova, M.; Bocak, L; Vogler, A. P. (2007). "A Comprehensive Phylogeny of Beetles Reveals the Evolutionary Origins of a Superradiation". Science. 318 (5858): 1913–1916. Bibcode:2007Sci...318.1913H. PMID 18096805. doi:10.1126/science.1146954.
- Hammond, P.M. (1992). Species inventory. Global Biodiversity, Status of the Earth's Living Resources: a Report (1st ed.). London: Chapman & Hall. pp. 17–39. ISBN 978-0-412-47240-4.
- Stork, Nigel E.; McBroom, James; Gely, Claire; Hamilton, Andrew J. (2015). "New approaches narrow global species estimates for beetles, insects, and terrestrial arthropods". PNAS. 116 (24): 7519–7523. Bibcode:2015PNAS..112.7519S. PMC . PMID 26034274. doi:10.1073/pnas.1502408112.
- Gullan, P.J.; Cranston, P.S. (2014). The Insects: An Outline of Entomology (5 ed.). John Wiley & Sons. p. 6. ISBN 1-4443-3036-5.
- Gullan, P. J.; Cranston, P. S. (2014). The Insects: An Outline of Entomology (5 ed.). John Wiley & Sons. p. 517. ISBN 1-4443-3036-5.
- "Heaviest insect". Guinness World Records. Retrieved 2017-02-01.
- Williams, David M. (2001). "Chapter 30 — Largest Insect". Book of Insect Records. University of Florida. Archived from the original on July 18, 2011.
- Polilov, Alexey (2015). "How small is the smallest? New record and remeasuring of Scydosella musawasensis Hall, 1999 (Coleoptera, Ptiliidae), the smallest known free-living insect". ZooKeys. 526: 61–64. PMC . PMID 26487824. doi:10.3897/zookeys.526.6531.
- Benisch, Christoph (2010). "Phylogeny of the beetles". The beetle fauna of Germany. Kerbtier. Retrieved March 16, 2011.
- Grimaldi, David; Engel, Michael S. (2005). Evolution of the Insects. Cambridge University Press. p. 397. ISBN 978-1-107-26877-7.
Triassic Curculionoidea have the same status as Triassic Chrysoleloidea: a relationship that is highly improbably and presently impossible to verify.
- Béthoux, Oliver (2009). "The earliest beetle identified". Journal of Paleontology. 83 (6): 931–937. doi:10.1666/08-158.1.
- Hörnschemeyer, T.; Stapf, H. "Die Insektentaphozönose von Niedermoschel (Asselian, unt. Perm; Deutschland)". Schriften der Alfred-Wegener-Stiftung (in German) (99/8): 98.
- Kukalová, J. (1969). "On the systematic position of the supposed Permian beetles, Tshecardocoleidae, with a description of a new collection from Moravia". Sborník geologických Věd, Paleontologie. 11: 139–161.
- Beckemeyer, R. J.; Engel, M. S. (2008). "A second specimen of Permocoleus (Coleoptera) from the Lower Permian Wellington Formation of Noble County, Oklahoma" (PDF). Journal of the Kansas Entomological Society. 81 (1): 4–7. doi:10.2317/JKES-708.01.1. Archived from the original (PDF) on July 18, 2011.
- Shcherbakov, D. E. (2008). "On Permian and Triassic insect faunas in relation to biogeography and the Permian-Triassic crisis". Paleontological Journal. 42 (1): 15–31. doi:10.1007/s11492-008-1003-1.
- Ponomarenko, A. G. (2004). "Beetles (Insecta, Coleoptera) of the Late Permian and Early Triassic" (PDF). Paleontological Journal. 38 (Suppl. 2): S185–S196. Archived from the original (PDF) on November 11, 2013.
- McHugh (2009), p. 186
- Labandeira, C. C.; Sepkoski, J. J. (1993). "Insect diversity in the fossil record" (PDF). Science. 261 (5119): 310–315. Bibcode:1993Sci...261..310L. PMID 11536548. doi:10.1126/science.11536548. Archived from the original (PDF) on March 31, 2012.
- Gratshev, Vadim G.; Zherikhin, Vladimir V. (October 15, 2003). "Insect diversity in the fossil record" (PDF). Acta Zoologica Cracoviensia. Fossil Insects. 261 (5119): 129–138. Bibcode:1993Sci...261..310L. PMID 11536548. doi:10.1126/science.11536548.
- Chang, H.; Zhang, F.; Ren, D. (2008). "A new genus and two new species of fossil elaterids from the Yixian Formation of Western Liaoning, China (Coleoptera: Elateridae)" (PDF). Zootaxa (1785): 54–62. Archived from the original (PDF) on July 4, 2011.
- Orekhovo-Zuyevo, A. V. A. (1993). "Jurassic and Lower Cretaceous Buprestidae (Coleoptera) from Eurasia" (PDF). Paleontological Journal (1A): 9–34.
- Ponomarenko, Alexandr G. (1985). "Fossil insects from the Tithonian 'Solnhofener Plattenkalke' in the Museum of Natural History, Vienna" (PDF). Annalen des Naturhistorischen Museums in Wien. 87 (1): 135–144.
- Yan, E. V. (2009). "A new genus of elateriform beetles (Coleoptera, Polyphaga) from the Middle-Late Jurassic of Karatau" (PDF). Paleontological Journal. 43 (1): 78–82. doi:10.1134/S0031030109010080. Archived from the original (PDF) on July 18, 2011.
- Tan, J.-J.; Ren, D.; Liu, M. (2005). "New ommatids from the Late Jurassic of western Liaoning, China (Coleoptera: Archostemata)" (PDF). Insect Science. 12 (3): 207–216. doi:10.1111/j.1005-295X.2005.00026.x. Archived from the original (PDF) on July 18, 2011.
- Ponomarenko, A. G. (1997). "New beetles of the family Cupedidae from the Mesozoic of Mongolia. Ommatini, Mesocupedini, Priacmini" (PDF). Paleontological Journal. 31 (4): 389–399. Archived from the original (PDF) on 2006-09-25.
- Alexeev, A. V. (2009). "New Jewel Beetles (Coleoptera: Buprestidae) from the Cretaceous of Russia, Kazakhstan, and Mongolia" (PDF). Paleontological Journal. 43 (3): 277–281. doi:10.1134/s0031030109030058. Archived from the original (PDF) on July 18, 2011.
- Chin, K.; Gill, B. D. (1996). "Dinosaurs, dung beetles, and conifers; participants in a Cretaceous food web". Palaois. 11 (3): 280–285. doi:10.2307/3515235.
- Arillo, Antonio & Ortuño, Vicente M. (2008). "Did dinosaurs have any relation with dung-beetles? (The origin of coprophagy)". Journal of Natural History. 42 (19&20): 1405–1408. doi:10.1080/00222930802105130.
- McNamara, M. E.; Briggs, D. E. G.; Orr, P. J.; Noh, H.; Cao, H. (2011). "The original colours of fossil beetles". Proceedings of the Royal Society B: Biological Sciences. 279 (1731): 1114. doi:10.1098/rspb.2011.1677.
- Coope, G. R. (1979). "Late Cenozoic Fossil Coleoptera: Evolution, Biogeography, and Ecology". Annual Reviews. 10: 246–267. JSTOR 2096792.
- Hutchinson, G. E. (1959). "Homage to Santa Rosalia or why are there so many kinds of animals?". The American Naturalist. 93 (870): 145–159. JSTOR 2458768. doi:10.1086/282070.
- Maddison, D. R. (1995). "Polyphaga". Tree of Life web project. Retrieved 27 February 2016.
- Beutel, R. G.; Lawrence, J. F. (2005). "4. Coleoptera (Morphology)". In Kristensen, N. P.; Beutel, R. G. Handbook of Zoology, Band 4: Arthropoda, 2: Insecta, Coleoptera, Beetles. Volume 1: Morphology and Systematics (Archostemata, Adephaga, Myxophaga, Polyphaga partim). p. 23. ISBN 3-11-017130-9.
- Beutel, R. G.; Ribera, I. (2005). "7. Adephaga Schellenberg, 1806". In Kristensen, N. P.; Beutel, R. G. Handbook of Zoology, Band 4: Arthropoda, 2: Insecta, Coleoptera, Beetles. Volume 1: Morphology and Systematics (Archostemata, Adephaga, Myxophaga, Polyphaga partim). p. 54. ISBN 3-11-017130-9.
- "Suborder Archostemata – Reticulated and Telephone-pole Beetles". BugGuide. 2006. Retrieved 2017-01-26.
- Lawrence, John F.; Ślipiński, Adam (2013). Australian Beetles. Morphology, Classification and Keys. CSIRO. pp. 1–16. ISBN 978-0-643-09728-5.
- Mesaros, Gabor (2013). "Sphaeriusidae (Coleoptera, Myxophaga): A new beetle family to the fauna of Serbia". Bulletin of the Natural History Museum (6): 71–74. doi:10.5937/bnhmb1306071m.
- Beutel, Rolf G.; Leschen, Richard (2005). Handbook of Zoology. Volume 4. Part 38. Arthropoda. Morphology and Systematics (Archostemata, Adephaga, Myxophaga, Polyphaga partim). Walter de Gruyter. p. 43.
- Whiting, Michael F. (2002). "Phylogeny of the holometabolous insect orders: molecular evidence". Zoologica Scripta. 31 (1): 3–15. doi:10.1046/j.0300-3256.2001.00093.x.
- Beutel, R.; Haas, F. (2000). "Phylogenetic relationships of the suborders of Coleoptera (Insecta)". Cladistics. 16: 103–141. doi:10.1111/j.1096-0031.2000.tb00350.x.
- Kukalová-Peck, J.; Lawrence, J. F. (1993). "Evolution of the hind wing in Coleoptera". Canadian Entomologist. 125 (2): 181–258. doi:10.4039/Ent125181-2.
- Maddison, D. R.; Moore, W.; Baker, M. D.; Ellis, T. M.; Ober, K. A.; Cannone, J. J.; Gutell, R. R. (2009). "Monophyly of terrestrial adephagan beetles as indicated by three nuclear genes (Coleoptera: Carabidae and Trachypachidae)". Zoologica Scripta. 38 (1): 43–62. PMC . PMID 19789725. doi:10.1111/j.1463-6409.2008.00359.x.
- Maddison, David R. (September 11, 2000). "Coleoptera. Beetle". Tree of Life Web Project. tolweb.org. Retrieved March 18, 2011.
- Niehuis, Oliver; Hartig, Gerrit; Grath, Sonja; et al. (2012). "Genomic and Morphological Evidence Converge to Resolve the Enigma of Strepsiptera". Current Biology. 22 (14): 1309–1313. PMID 22704986. doi:10.1016/j.cub.2012.05.018.
- McKenna, Duane D.; Wild, Alexander L.; et al. (2015). "The beetle tree of life reveals that Coleoptera survived end-Permian mass extinction to diversify during the Cretaceous terrestrial revolution". Systematic Entomology. 40 (4): 835–880. doi:10.1111/syen.12132.
- Hunt, Toby; et al. (2007). "A Comprehensive Phylogeny of Beetles Reveals the Evolutionary Origins of a Superradiation". Science. 318 (5858): 1913–19116. PMID 18096805. doi:10.1126/science.1146954.
- "Introduction to the Identification of Beetles (Coleoptera)" (PDF). University of Florida. Retrieved 15 March 2017.
- Hangay, G.; Zborowski, P. (2010). A Guide to the Beetles of Australia. CSIRO. p. 10.
- Christoph Benisch (2007). "3. Antennae, Beetle morphology". Kerbtier.de (Beetle fauna of Germany). Retrieved 2017-03-14.
- Zurek, D. B.; Gilbert, C. (2014). "Static antennae act as locomotory guides that compensate for visual motion blur in a diurnal, keen-eyed predator". Proceedings of the Royal Society B: Biological Sciences. 281 (1779): 20133072. doi:10.1098/rspb.2013.3072.
- Berkov, Amy; Rodríguez, Nelson; Centeno, Pedro (2007). "Convergent evolution in the antennae of a cerambycid beetle, Onychocerus albitarsis, and the sting of a scorpion". Naturwissenschaften. 95 (3): 257. PMID 18004534. doi:10.1007/s00114-007-0316-1.
- "Antennae Types". University of Sydney. Retrieved 2017-01-26.
- Arnett, Jr., R. H.; Thomas, M. C. (2001). American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia. CRC Press. pp. 3–7. ISBN 1-4822-7432-9.
- "Anatomy: Head, Thorax, Abdomen, and Genitalia (Insects)". what-when-how.com. Retrieved 2017-01-26.
- Green, Kristina Karlsson; Kovalev, Alexander; Svensson, Erik I.; Gorb, Stanislav N. (2013). "Male clasping ability, female polymorphism and sexual conflict: fine-scale elytral morphology as a sexually antagonistic adaptation in female diving beetles". Journal of The Royal Society Interface. 10 (86): 20130409. PMC . PMID 23825114. doi:10.1098/rsif.2013.0409.
- Burkness, S.; Hahn, J. (2007). "Flea beetles in home gardens". University of Minnesota (Extension). Retrieved 2017-01-26.
- Carpenter, George Herbert (1899). Insects, their structure and life.
- Philips, Chris; Fread, Elizabeth; Kuhar, Tom, Leatherwing (Soldier) Beetles (PDF), retrieved 14 March 2017
- Donald W. Hall; Marc A. Branham (2016). "Calopteron discrepans (Newman) (Insecta: Coleoptera: Lycidae)". University of Florida. Retrieved 2017-03-15.
- Lawrence, J. F.; Hastings, A. M.; Dallwitz, M. J.; Paine, T. A.; Zurcher, E. J. (2005). "Elateriformia (Coleoptera): descriptions, illustrations, identification, and information retrieval for families and subfamilies". Retrieved 2017-01-26.
- Beenen, R; Winkelman, J. K. (2001). "Aantekeningen over Chrysomelidae in Nederland 5". Entomologische Berichten (in Dutch). 61: 63–67.
- Arnett, Ross H., Jr; Thomas, Michael C. (2000). American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia. CRC Press. p. 8. ISBN 978-1-4822-7432-5.
- Seymour, Roger S.; Matthews, Philip G. D. (2012). "Physical gills in diving insects and spiders: Theory and experiment". The Journal of Experimental Biology. 216 (2): 164. doi:10.1242/jeb.070276.
- Schmidt-Nielsen, Knut (January 15, 1997). "Insect Respiration". Animal Physiology: Adaptation and Environment (5th ed.). Cambridge University Press. p. 55. ISBN 0-521-57098-0.
- Miller, T. A. (1985). "Chapter 8: Structure and Physiology of the Circulatory System". In Kerkut, G. A.; Gilbert, L. I. Comprehensive Insect Physiology, Biochemistry and Pharmacology. Volume 3: Integument, Respiration and Circulation. Pergamom Press. pp. 289–355. ISBN 0-08-030804-X.
- Scoble, M. J. (1992). The Lepidoptera: Form, function, and diversity. Oxford University Press. ISBN 978-1-4020-6242-1.
- Ozbek, H.; Szalokia, D. (1998). "A contribution to the knowledge of the Meloidae (Coleoptera) fauna of Turkey along with new record". Turkish Journal of Zoology. 22: 23–40.
- Medvedev, L. N.; Pavlov, S. I. (1988). "Mating behavior of the Chrysomelidae (Coleoptera)". Entomological Review. 67: 100–108.
- Crowson, R. A. (2013). The Biology of the Coleoptera. Elsevier Science. pp. 358–370. ISBN 978-1-4832-1760-4.
- Beck, S. D.; Bharadwaj, R. K. (1972). "Reversed development and cellular ageing in an insect". Science. 178 (4066): 1210–1211. Bibcode:1972Sci...178.1210B. PMID 4637808. doi:10.1126/science.178.4066.1210.
- "Definition of 'Scarabaeiform'". Amateur Entomologists' Society. Retrieved 2017-01-27.
- Krinsky, W. L. (2009). "8 Beetles (Coleoptera)". In Mullen, G. R.; Durden, L. A. Medical and Veterinary Entomology (2nd ed.). Elsevier. pp. 101–115. ISBN 978-0-12-372500-4.
- "Hypermetamorphosis of Striped Blister Beetle – Epicauta vittata". BugGuide. 2007. Retrieved 2017-01-27.
- Zeng, Yong (1995). "Longest Life Cycle". University of Florida. Retrieved 17 March 2017.
- Jeffries, Daniel L.; Chapman, Jason; Roy, Helen E.; Humphries, Stuart; Harrington, Richard; Brown, Peter M. J.; Handley, Lori-J. Lawson (2013). "Characteristics and Drivers of High-Altitude Ladybird Flight: Insights from Vertical-Looking Entomological Radar". PLOS ONE. 8 (2): e82278. doi:10.1371/journal.pone.0082278.
- Capinera, John L. (2008). Encyclopedia of Entomology (2 ed.). Springer Science & Business Media. pp. 3218–3219. ISBN 978-1-4020-6242-1.
- Arnett R. H., Jr.; Thomas, M. C. (2001). "Haliplidae". American Beetles, Volume 1. CRC Press. pp. 138–143. ISBN 0-8493-1925-0.
- "Mountain Pine Beetle – Beetle Love". Parks Canada. Retrieved March 13, 2011.
- Wyatt, T. D. & Foster, W. A. (1989). "Parental care in the subsocial intertidal beetle, Bledius spectabilis, in relation to parasitism by the ichneumonid wasp, Barycnemis blediator". Behaviour. 110 (1–4): 76–92. JSTOR 4534785. doi:10.1163/156853989X00394.
- Hanski, Ilkka; Yves, Cambefort (1991). Dung Beetle Ecology. Princeton University Press. pp. 626–672. ISBN 0-691-08739-3.
- Crespi, B. J.; Yanega, D. (1995). "The definition of eusociality". Behavioral Ecology. 6 (1): 109–115. doi:10.1093/beheco/6.1.109.
- Kent, D. S. & Simpson, J. A. (1992). "Eusociality in the beetle Austroplatypus incompertus (Coleoptera: Curculionidae)". Naturwissenschaften. 79 (2): 86–87. Bibcode:1992NW.....79...86K. doi:10.1007/BF01131810.
- "Science: The Australian beetle that behaves like a bee". New Scientist. 1992-05-09. Retrieved 2010-10-31.
- Schuster, Jack C.; Schuster, Laura B. (1985). "Social behavior in Passalid beetles (Coleoptera: Passalidae): Cooperative brood care". Florida Entomologist. 68 (2): 266–272. doi:10.2307/3494359.
- Lobanov, A.L. (2002). "feeding". Beetle Biology And Ecology. Beetles (Coleoptera) and Coleopterologist. Retrieved March 13, 2011.
- Islam, M.; Hossain, A.; Mostafa, M. G.; Hossain, M. M. (2016). "Forensically important insects associated with the decomposition of mice carrion in Bangladesh". Jahangirnagar University Journal of Biological Science. 5 (1): 11–20. doi:10.3329/jujbs.v5i1.29739.
- Grebennikov, Vasily V.; Leschen, Richard A. B. (2010). "External exoskeletal cavities in Coleoptera and their possible mycangial functions". Entomological Science. 13 (1): 81–98. doi:10.1111/j.1479-8298.2009.00351.x.
- Evans & Bellamy (2000), pp. 27–28
- Cott, H. B. (1940). Adaptive Coloration in Animals. Methuen. p. 414.
- Evans & Bellamy (2000), p. 126
- Evans & Bellamy (2000)
- McHugh (2009), p. 199
- Peck, Stewart B. (2006). "Distribution and biology of the ectoparasitic beaver beetle Platypsyllus castoris Ritsema in North America (Coleoptera: Leiodidae: Platypsyllinae)". Insecta Mundi. 20 (1–2): 85–94.
- Neumann, P. & Elzen, P. J. (2004). "The biology of the small hive beetle (Aethina tumida, Coleoptera: Nitidulidae): Gaps in our knowledge of an invasive species". Apidologie. 35 (3): 229–247. doi:10.1051/apido:2004010.
- Meyer, John R. (March 8, 2005). "Coleoptera". North Carolina State University. Retrieved March 13, 2011.
- Gullan, P. J.; Cranston, P. S. (2014). The Insects: An Outline of Entomology (5 ed.). Wiley, John & Sons. p. 314. ISBN 1-4443-3036-5.
- Jones, G. D. & Jones, S. D. (2001). "The uses of pollen and its implication for Entomology". Neotropical Entomology. 30 (3): 314–349. doi:10.1590/S1519-566X2001000300001.
- Ollerton, J.; Johnson, S. D.; Cranmer, L. & Kellie, S. (2003). "The pollination ecology of an assemblage of grassland asclepiads in South Africa". Annals of Botany. 92 (6): 807–834. PMC . PMID 14612378. doi:10.1093/aob/mcg206.
- Malloch, D.; Blackwell, M. (1993). "Dispersal biology of ophiostomatoid fungi". In Wingfield, M. J.; K. A. Seifert; J. F. Webber. Ceratocystis and Ophiostoma: Taxonomy, Ecology and Pathology. St. Paul: APS. pp. 195–206. ISBN 978-0-89054-156-2.
- Scott, J. J.; Oh, D. C.; Yuceer, M. C.; Klepzig, K. D.; Clardy, J.; Currie, C. R. (2008). "Bacterial protection of beetle-fungus mutualism". Science. 322 (5898): 63. PMC . PMID 18832638. doi:10.1126/science.1160423.
- Francke-Grossmann, H. (1967). "Ectosymbiosis in wood inhabiting insects". In M. Henry. Symbiosis. 2. New York: Academic Press. pp. 141–205.
- Ivo Hodek (2012). "Review Article: Adult Diapause in Coleoptera". Psyche: A Journal of Entomology. 2012: 1. doi:10.1155/2012/249081.
- Kaufmann, T. (1971). "Hibernation in the Arctic Beetle, Pterostichus brevicornis, in Alaska". Journal of the Kansas Entomological Society. 44 (1): 81–92.
- Gullan, P. J.; Cranston, P. S. (1994). The Insects: An Outline of Entomology. Chapman and Hall. pp. 103–104. ISBN 0-412-49360-8.
- Lombadero, Maria J.; Ayres, Matthew P.; Ayres, Bruce D.; Reeve, John D. (2000). "Cold Tolerance of Four Species of Bark Beetle (Coleoptera: Scolytidae) in North America" (PDF). Environmental Ecology. 29 (3): 421–432.
- Sformo, T.; Walters, K.; Jeannet, K.; Wowk, B.; Fahy, G. M.; Barnes, B. M.; Duman, J. G. (2010). "Deep supercooling, vitrification and limited survival to −100°C in the Alaskan beetle Cucujus clavipes puniceus (Coleoptera: Cucujidae) larvae". Journal of Experimental Biology. 213 (3): 502–509. PMID 20086136. doi:10.1242/jeb.035758.
- Christopher Brooks (2013-03-26). "The life of extremophiles: Surviving in hostile habitats". BBC Nature. Retrieved 2017-03-16.
- Graham, L. A; Liou, Y. C.; Walker, V. K.; Davies, P. L. (August 1997). "Hyperactive antifreeze protein from beetles". Nature. 388 (6644): 727–728. PMID 9285581. doi:10.1038/41908.
The yellow mealworm beetle,Tenebrio molitor, contains a family of small Cys-rich and Thr-rich thermal hysteresis proteins that depress the hemolymph freezing point below the melting point by as much as 5.58°C(ΔT=thermal hysteresis). Thermal hysteresis protein expression was evaluated throughout development and after exposure to altered environmental conditions.
- Walters, K. R. Jr; Serianni, A. S.; Sformo, T.; Barnes, B. M.; Duman, J. G. (2009). "A nonprotein thermal hysteresis-producing xylomannan antifreeze in the freeze-tolerant Alaskan beetle Upis ceramboides". PNAS. 106 (48): 20210–20215. PMC . PMID 19934038. doi:10.1073/pnas.0909872106.
- Walters, Jr., K. R.; Pan, Q.; Serianni, A. S.; Duman, J. G. (2009). "Cryoprotectant biosynthesis and the selective accumulation of threitol in the freeze-tolerant Alaskan beetle, Upis ceramboides". Journal of Biological Chemistry. 284 (25): 16822–16831. PMC . PMID 19403530. doi:10.1074/jbc.M109.013870.
- Edney, E. B. (1971). "The Body Temperature of Tenerionid Beetles in the Namid Desert of Southern Africa" (PDF). Journal of Experimental Biology. 55: 253–272.
- Knisley, C. B.; Schultz, T. D.; Hasewinkel, T. H. (1990). "Seasonal Activity and Thermoregulatory Behavior of Cicindela patruela (Coleoptera: Cicindelidae)". Annals of the Entomological Society of America. 83 (5): 911. doi:10.1093/aesa/83.5.911.
- Parker, Andrew R.; Lawrence, Chris R. (2001-11-01). "Water capture by a desert beetle". Nature. 414 (6859): 33–34. PMID 11689930. doi:10.1038/35102108. Retrieved 2017-03-14.
- Hoback, W. Wyatt; Stanley, David W.; Higley, Leon G.; Barnhart, M. Christopher. "Survival of Immersion and Anoxia by Larval Tiger Beetles, Cicindela togata". The American Midland Naturalist. 140 (1): 27–33. doi:10.1674/0003-0031(1998)140[0027:SOIAAB]2.0.CO;2.
- Conradi-Larsen, Else-Margrete; Sømme, Lauritz (1973). "Anaerobiosis in the Overwintering Beetle Pelophila borealis". Nature. 245: 388–390. doi:10.1038/245388a0.
- Allison, R. (2015-03-17). "Half of the UK sees start of pollen beetle migration". Retrieved 2017-03-16.
- Southwood, T. R. E. (1962). "Migration of Terrestrial Arthropods in Relation to Habitat". Biological Reviews. 37 (2): 171. doi:10.1111/j.1469-185X.1962.tb01609.x.
- Dingle, H. (2014). Migration: The Biology of Life on the Move. Oxford University Press.
- Zabludoff, Marc (2008). Beetles. Malaysia: Michelle Bison. pp. 14–17. ISBN 978-0-7614-2532-8.
- Cambefort, Yves (2011). "Beetles as religious symbols". Insects.org. Retrieved 10 February 2017.
- Dollinger, André (January 2002). "Ancient Egyptian bestiary: Insects". Retrieved July 19, 2011.
- Morales-Correa, Ben (2006). "Egyptian Symbols". All-About-Egypt. Retrieved July 19, 2011.
- Ussishkin, David (2004). The New Archaeological Excavations at Lachish (1973–1994). Tel Aviv: Institute of Archaeology of Tel Aviv University.
- "Isis and Osiris", Moralia, in volume V of the Loeb Classical Library, 1936. "The race of beetles has no female, but all the males eject their sperm into a round pellet of material which they roll up by pushing it from the opposite side, just as the sun seems to turn the heavens in the direction opposite to its own course, which is from west to east.
- Betz, H. D., ed. (1992). The Greek Magical Papyri in Translation (Including the Demotic Spells) (2nd ed.). University of Chicago Press. pp. IV.52–85; VII.520; XII.101; XIII.1065–1070; XXXVI.170.
- Pliny the Elder. "Natural History Book 11". Perseus.tufts.edu. Retrieved 2017-01-25.
- Pliny the Elder. "Natural History Book 11, Chapter 34". Perseus.tufts.edu. Retrieved 2017-01-25.
- Beavis, I. C. (1988). Insects and other Invertebrates in Classical Antiquity. University of Exeter. pp. 153–154.
- Antoninus Liberalis. Metamorphoses. Trans. Celoria, F. 1992. The Metamorphoses of Antoninus Liberalis: A translation with a commentary. London and New York, Routledge.
- Sprecher-Uebersax, E. (2008). "The Stag Beetle Lucanus Cervus (Coleoptera, Lucanidae) in Art and Mythology". Revue d' Ecologie. 63: 145–151.
- Mississippi State University. "History of the Boll Weevil in the United States". Economic impacts of the boll weevil. Archived from the original on May 12, 2008.
- Allen, E. A.; Humble, L. M. (2002). "Nonindigenous species introductions: A threat to Canada's forests and forest economy". Canadian Journal of Plant Pathology. 24 (2): 103. doi:10.1080/07060660309506983.
- Webber, Joan F. (2000). "Insect Vector Behavior and the Evolution of Dutch Elm Disease". The Elms. p. 47. ISBN 978-1-4613-7032-1. doi:10.1007/978-1-4615-4507-1_3.
- Alyokhin, A.; Baker, M.; Mota-Sanchez, D.; Dively, G.; Grafius, E. (2008). "Colorado potato beetle resistance to insecticides". American Journal of Potato Research. 85 (6): 395–413. doi:10.1007/s12230-008-9052-0.
- Lockwood, Jeffrey A. (2007-10-21). "Bug bomb:Why our next terrorist attack could come on six legs". Boston Globe. Retrieved 2017-02-13.
- Heather, Neil W.; Hallman, Guy J. (2008). Pest Management and Phytosanitary Trade Barriers. CABI. pp. 17–18. ISBN 1-84593-343-5. doi:10.1079/9781845933432.0000.
- Adcock, Edward (2005). "Pests – Death watch beetle". Conservation and collective care. University of Oxford. Archived from the original on July 10, 2011. Retrieved July 17, 2011.
- Takano, Shun-Ichiro; Takasu, Keiji; Fushimi, Tsutomu; Ichiki, Ryoko T.; Nakamura, Satoshi (2014). "Suitability of four palm species for the development of the invasive pest Brontispa longissima(Coleoptera: Chrysomelidae) in the field". Entomological Science. 17 (2): 265. doi:10.1111/ens.12048.
- "The Mountain Pine Beetle in British Columbia". Natural Resources Canada. August 19, 2008. Archived from the original on April 19, 2010. Retrieved June 24, 2010.
- "Insecta: Coleoptera: Coccinellidae". Institute of Food and Agricultural Services, University of Florida. 2014. Retrieved 2017-02-12.
- "'Deadly ladybird' sighted in UK". BBC News. October 5, 2004. Retrieved June 17, 2010.
- Kromp, B. (1999). "Carabid beetles in sustainable agriculture: a review on pest control efficacy, cultivation aspects and enhancement". Agriculture, Ecosystems and Environment. 74 (1–3): 187–228. doi:10.1016/S0167-8809(99)00037-7.
- "Beetles play an important role in reducing weeds". Rothamsted Research. Retrieved 14 March 2017.
- "Zygogramma bicolorata (Mexican beetle)". Invasive Species Compendium. 2012. Retrieved 2017-02-12.
- Kovalev, O. V.; Reznik, S. Y.; Cherkashin, V. N. (1983). "Specific features of the methods of using Zygogramma Chevr. (Coleoptera, Chrysomelidae) in biological control of ragweeds (Ambrosia artemisiifolia L., A. psilostachya D.C.)". Entomologicheskoe Obozrenije (in Russian). 62: 402–408.
- Bornemissza, George (1970). "Insectary Studies on the Control of Dung Breeding Flies by the Activity of the Dung Beetle, Onthophagus Gazella F. (Coleoptera: Scarabaeinae)". Australian Journal of Entomology. 9: 31–41. doi:10.1111/j.1440-6055.1970.tb00767.x.
- Brown, Jacqueline; Scholtz, Clarke H.; Janeau, Jean-Louis; Grellier, Seraphine & Podwojewski, Pascal (2010). "Dung beetles (Coleoptera: Scarabaeidae) can improve soil hydrological properties". Applied Soil Ecology. 46 (1): 9–16. doi:10.1016/j.apsoil.2010.05.010.
- Losey, John E.; Vaughan, Mace (2006). "The economic value of ecological services provided by insects" (PDF). BioScience. 56 (4): 311–323. doi:10.1641/0006-3568(2006)56[311:TEVOES]2.0.CO;2.
- Tomberlin, Jeffery K.; Sanford, Michelle R. (2012). "Forensic entomology and wildlife". In Huffman, Jane E.; Wallace, John R. Wildlife Forensics: Methods and Applications. Developments in Forensic Science. 6 (2nd ed.). John Wiley & Sons. pp. 81–107. ISBN 978-1-119-95429-3.
- Dermestid Beetles working on a female Black Bear skull. 2014. Retrieved 2017-01-26.
- Fernández-Jalvo, Yolanda; Monfort, Maria Dolores Marín (2008). "Experimental taphonomy in museums: Preparation protocols for skeletons and fossil vertebrates under the scanning electron microscopy". Geobios. 41: 157. doi:10.1016/j.geobios.2006.06.006.
- Ramos-Elorduy, Julieta; Menzel, Peter (1998). Creepy crawly cuisine: the gourmet guide to edible insects. Inner Traditions / Bear & Company. p. 5. ISBN 978-0-89281-747-4.
- Holland, Jennifer S. (14 May 2013). "U.N. Urges Eating Insects; 8 Popular Bugs to Try". National Geographic. Retrieved 26 January 2017.
- Pearson, David L.; Cassola, Fabio (1992). "World-Wide Species Richness Patterns of Tiger Beetles (Coleoptera: Cicindelidae): Indicator Taxon for Biodiversity and Conservation Studies". Conservation Biology. 6 (3): 376–391. JSTOR 2386038. doi:10.1046/j.1523-1739.1992.06030376.x.
- McGeoch, Melodie A.; Van Rensburg, Berndt J.; Botes, Antoinette (2002). "The verification and application of bioindicators: A case study of dung beetles in a savanna ecosystem". Journal of Applied Ecology. 39 (4): 661. doi:10.1046/j.1365-2664.2002.00743.x.
- Lachat, Thibault; Wermelinger, Beat; Gossner, Martin M.; Bussler, Heinz; Isacsson, Gunnar; Müller, Jörg (2012). "Saproxylic beetles as indicator species for dead-wood amount and temperature in European beech forests". Ecological Indicators. 23: 323. doi:10.1016/j.ecolind.2012.04.013.
- Bohac, Jaroslav (1999). "Staphylinid beetles as bioindicators". Agriculture, Ecosystems & Environment. 74 (1–3): 357–372. doi:10.1016/S0167-8809(99)00043-2.
- Life cycle of the rounded jewel beetles, Sternocera spp. วงจรชีวิตของแมลงทับกลมใช้เวลานานถึง 2 ปี – Siam Insect Zoo-Museum. Malaeng.com (2008-10-20). Retrieved on 2013-04-04.
- Ivie, Michael A. (2002). "105. Zopheridae". In Ross H. Arnett; Michael Charles Thomas. American Beetles: Polyphaga: Scarabaeoidea through Curculionoidea. Volume 2 of American Beetles. CRC Press. pp. 457–462. ISBN 978-0-8493-0954-0.
- Rennesson, Stephane; Cesard, Nicolas; Grimaud, Emmanuel (2008). "Duels en miniature: la délicate mise en scène des combats de scarabées au nord de la Thaïlande" (PDF). Insectes (in French). INRA. 3 (151).
- Eraldo Medeiros Costa-Neto (2003). "Entertainment with insects: singing and fighting insects around the world. A brief review" (PDF). Etnobiología. 3: 21–29.
- Pemberton, R. W. (1990). "The Korean water beetle game". Pan-Pacific Entomologist. 66 (2): 172–174.
- Bateman, C.; Hulcr, J. (2016). "Predaceous Diving Beetles as Pets and the Self-Cleaning Aquarium" (PDF). University of Florida (IFAS Extension). Retrieved 2017-01-27.
- Kawahara, A. Y. (2007). "Thirty-foot telescopic nets, bug-collecting video games, and beetle pets: Entomology in modern Japan" (PDF). American Entomologist. 53 (3): 160–172. doi:10.1093/ae/53.3.160.
- May, Mitchell (11 July 1999). "Yen For Bugs". Chicago Tribune. Retrieved 2017-01-27.
- Watts, Jonathan (11 August 1999). "Vending machine beetles". The Guardian. Retrieved 2017-01-27.
- Morse, Deborah Denenholz; Danahay, Martin A. (2007). Victorian Animal Dreams: Representations of Animals in Victorian Literature and Culture. Ashgate Publishing. p. 5. ISBN 978-0-7546-5511-4.
the Victorian mania for beetle collecting
- Wallace, Alfred Russel (1869). The Malay Archipelago: The land of the orang–utan, and the bird of paradise. A narrative of travel, with sketches of man and nature (1 ed.). Macmillan. pp. vii–xiv.
- Swedish Biomimetics: The μMist Platform Technology Archived December 13, 2013, at the Wayback Machine.. Retrieved 3 June 2012.
- "Namib Desert beetle inspires self-filling water bottle". BBC News. 2012-11-23.
- Emily Singer (2009-01-29). "The Army's Remote-Controlled Beetle". MIT Technology Review. Retrieved 2017-03-16.
- Feng Cao; Chao Zhang; Hao Yu Choo; Hirotaka Sato (2016). "Insect–computer hybrid legged robot with user-adjustable speed, step length and walking gait". Journal of the Royal Society Interface. 13 (116): 1–10. doi:10.1098/rsif.2016.0060.
- Kotze, D. Johan; O'Hara, Robert B. (2003). "Species decline—but why? Explanations of carabid beetle (Coleoptera, Carabidae) declines in Europe". Oecologia. 135 (1): 138–148. doi:10.1007/s00442-002-1174-3.
- Hanski, Ilkka; Koivulehto, Helena; Cameron, Alison; Rahagalala, Pierre (2007). "Deforestation and apparent extinctions of endemic forest beetles in Madagascar". Biology Letters. 3 (3): 344–347. PMC . PMID 17341451. doi:10.1098/rsbl.2007.0043.
- Campanaro, A.; Zapponi, L.; Hardersen, S.; Méndez, M.; Al Fulaij, N.; Audisio, P.; Bardiani, M.; Carpaneto, G. M.; Corezzola, S.; Della Rocca, F.; Harvey, D.; Hawes, C.; Kadej, M.; Karg, J.; Rink, M.; Smolis, A.; Sprecher, E.; Thomaes, A.; Toni, I.; Vrezec, A.; Zauli, A.; Zilioli, M.; Chiari, S. (2016). "A European monitoring protocol for the stag beetle, a saproxylic flagship species". Insect Conserv Divers. 9 (6): 574–584. doi:10.1111/icad.12194.
- New, T. R. (2009). Beetles in Conservation. John Wiley & Sons. pp. ix, 1–26, passim. ISBN 978-1-4443-1863-0.
- Evans, Arthur V.; Bellamy, Charles (2000). An Inordinate Fondness for Beetles. University of California Press. ISBN 978-0-520-22323-3.
- McHugh, Joseph V.; Liebherr, James K. (2009). "Coleoptera". In Vincent H. Resh; Ring T. Cardé. Encyclopedia of Insects (2nd ed.). Academic Press. pp. 183–201. ISBN 978-0-12-374144-8.
- Beckmann, Poul. Living Jewels: The Natural Design of Beetles. ISBN 3-7913-2528-0.
- Cooter, J.; M. V. L. Barclay, eds. (2006). A Coleopterist's Handbook. Amateur Entomological Society. ISBN 0-900054-70-0.
- Beetle Larvae of the World. Entomological Society of America. ISBN 0-643-05506-1.
- Grimaldi, David; Michael S. Engel. Evolution of the Insects. ISBN 0-521-82149-5.
- Harde, K. W. A Field Guide in Color to Beetles. pp. 7–24. ISBN 0-7064-1937-5.
- White, R. E. (1983). Beetles. Houghton Mifflin. ISBN 0-395-91089-7.