Temporal range: Triassic–Recent 
|Juvenile Gryllus campestris|
See Taxonomy section
Crickets, family Gryllidae (also known as "true crickets"), are insects related to grasshoppers. The Gryllidae have mainly cylindrical bodies, round heads and long antennae. Behind the head is a smooth, robust pronotum. The abdomen ends in a pair of long cerci (spikes); females have a long cylindrical ovipositor. The hind legs have enlarged femora (thighs), providing power for jumping. The front wings are adapted as tough, leathery elytra (wing covers) and it is by rubbing parts of these together that some crickets chirp. The hind wings are membranous and folded when not in use for flight; many species however are flightless. The largest members of the family are the bull crickets, Brachytrupes, which are up to 5 cm (2 in) long.
There are more than 900 species of crickets; the Gryllidae are distributed all around the world except at latitudes 55° or higher, with the greatest diversity being in the tropics. They occur in varied habitats from grassland, bushes and forest to marshes, beaches and caves. Crickets are mainly nocturnal, and are best known for the loud persistent chirping song of males trying to attract females, although some species are mute. The singing species have good hearing, via the tympani (eardrums) on the tibiae of the front legs.
Crickets appear as characters in literature. The Talking Cricket features in Carlo Collodi's 1883 children's book, The Adventures of Pinocchio, and in films based on the book. The eponymous insect is central to Charles Dickens's 1845 The Cricket on the Hearth, as is the chirping insect in George Selden's 1960 The Cricket in Times Square. Crickets are celebrated in poems by William Wordsworth, John Keats, and Du Fu. They are kept as pets in countries from China to Europe, sometimes for cricket fighting. Crickets are used as food in Southeast Asia, where they are sold deep-fried in markets as snacks. They are also used to feed carnivorous pets and zoo animals. In Brazilian folklore, crickets feature as omens of various events.
- 1 Description
- 2 Distribution and habitat
- 3 Biology
- 4 Phylogeny and taxonomy
- 5 In human culture
- 6 Notes
- 7 References
- 8 Sources
- 9 External links
Crickets are small to medium-sized insects with mostly cylindrical, somewhat vertically flattened bodies. The head is spherical with long slender antennae arising from cone-shaped scapes (first segments) and just behind these are two large compound eyes. On the forehead are three ocelli (simple eyes). The pronotum (first thoracic segment) is trapezoidal in shape, robust and well-sclerotinized. It is smooth and has neither dorsal or lateral keels (ridges).
At the tip of the abdomen is a pair of long cerci (paired appendages on rearmost segment), and in females, the ovipositor is cylindrical, long and narrow, smooth and shiny. The femora (third segments) of the back pair of legs are greatly enlarged for jumping. The tibiae (fourth segments) of the hind legs are armed with a number of moveable spurs, the arrangement of which is characteristic of each species. The tibiae of the front legs bear one or more tympani which are used for the reception of sound.
The wings lie flat on the body and are very variable in size between species, being reduced in size in some crickets and missing in others. The forewings are elytra made of tough chitin, acting as a protective shield for the soft parts of the body and in males, bear the stridulatory organs for the production of sound. The hind pair are membranous, folding fan-wise under the forewings. In many species the wings are not adapted for flight.
The largest members of the family are the 5 cm (2 in)-long bull crickets (Brachytrupes) which excavate burrows a metre or more deep. The tree crickets (Oecanthinae) are delicate white or pale green insects with transparent forewings while the field crickets (Gryllinae) are robust brown or black insects.
Distribution and habitat
Crickets have a cosmopolitan distribution, being found in all parts of the world with the exception of cold regions at latitudes higher than about 55° North and South. They have colonised many large and small islands, sometimes flying over the sea to reach these locations, or perhaps conveyed on floating timber or by human activity. The greatest diversity occurs in tropical locations, such as in Malaysia, where 88 species were heard chirping from a single location near Kuala Lumpur. There could have been a greater number than this present because some species are mute.
Crickets are found in many habitats. Members of several subfamilies are found in the upper tree canopy, in bushes and among grasses and herbs. They also occur on the ground and in caves, and some are subterranean, excavating shallow or deep burrows. Some make galleries in rotting wood, and certain beach-dwelling species can run and jump over the surface of pools.
Crickets are relatively defenceless, soft-bodied insects. Most species are nocturnal and spend the day hidden in cracks, under bark, inside curling leaves, under stones or fallen logs, in leaf litter or in the cracks in the ground that develop in dry weather. Some excavate their own shallow holes in rotting wood or underground and fold in their antennae to conceal their presence. Some of these burrows are temporary shelters, used for a single day, but others serve as more permanent residences and places for mating and laying eggs. Burrowing is performed by loosening the soil with the mandibles and then carrying it with the limbs, flicking it backwards with the hind legs or pushing it with the head.
Other defensive strategies are the use of camouflage, fleeing and aggression. Some species have adopted colourings, shapes and patterns that make it difficult for predators that hunt by sight to detect them. They tend to be dull shades of brown, grey and green that blend into their background, and desert species tend to be pale. Some species can fly but the mode of flight tends to be clumsy, so the most usual response to danger is to scuttle away to find a hiding place.
Most male crickets make a loud chirping sound by stridulation (a few species are mute). The stridulatory organ is located on the tegmen, or forewing, which is leathery in texture. There is a large vein running along the centre of each tegmen, with comb-like serrations on its edge forming a file-like structure, and at the rear edge of the tegmen is a scraper. The tegmina are held at an angle to the body and rhythmically raised and lowered which causes the scraper on one wing to rasp on the file on the other. In the central part of the tegmen is the "harp". This is an area of thick, sclerotinized membrane which resonates and amplifies the volume of sound, as does the pocket of air between the tegmina and the body wall. Most female crickets lack the necessary adaptations to stridulate, and these make no sound.
There are several types of cricket song in the repertoire of some species. The calling song attracts females and repels other males, and is fairly loud. The courting song is used when a female cricket is near and encourages her to mate with the caller. A triumphal song is produced for a brief period after a successful mating, and may reinforce the mating bond to encourage the female to lay some eggs rather than find another male. An aggressive song is triggered by contact chemoreceptors on the antennae that detect the presence of another male cricket.
Crickets chirp at different rates depending on their species and the temperature of their environment. Most species chirp at higher rates the higher the temperature is (approximately 62 chirps a minute at 13 °C in one common species; each species has its own rate). The relationship between temperature and the rate of chirping is known as Dolbear's Law. According to this law, counting the number of chirps produced in 14 seconds by the snowy tree cricket, common in the United States, and adding 40 will approximately equal the temperature in degrees Fahrenheit.
In 1975, Dr. William H. Cade discovered that the parasitic tachinid fly Ormia ochracea is attracted to the song of the cricket, and uses it to locate the male in order to deposit her larvae on him. It was the first known example of a natural enemy that locates its host or prey using the mating signal. Since then, many species of crickets have been found to be carrying the same parasitic fly, or related species. In response to this selective pressure, a mutation leaving males unable to chirp was observed amongst a population of field crickets on the Hawaiian island of Kauai, enabling these crickets to elude their parasitoid opponents.
Some species such as the ground crickets (Nemobiinae) are wingless, others have small forewings and no hind wings (Copholandrevus), others lack hind wings and have shortened forewings in females only, while others are macropterous, with the hind wings longer than the forewings. In Teleogryllus, the proportion of macropterous individuals varies from very low to 100%. Probably most species with hind wings longer than forewings engage in flight.
Some species like Gryllus assimilis take off, fly and land efficiently and well, while other species are clumsy fliers. In some species, the hind wings are shed leaving wing stumps, usually after dispersal of the insect by flight. In other species they may be pulled off and consumed by the cricket itself or by another individual, probably providing a nutritional boost.
Gryllus firmus exhibits wing polymorphism; some individuals have fully functional, long hind wings and others have short wings and cannot fly. The short-winged females have smaller flight muscles, greater ovarian development and produce more eggs, so the polymorphism adapts the cricket for either dispersal or reproduction. In some long-winged individuals, the flight muscles deteriorate during adulthood and the insect's reproductive capabilities improve.
Captive crickets are omnivorous: when deprived of their natural diet, they will accept a wide range of different organic foodstuffs. Some species are completely herbivorous, feeding on flowers, fruit and leaves, with ground-based species consuming seedlings, grasses, pieces of leaf and the shoots of young plants. Others are more predatory and include in their diet invertebrate eggs, larvae, pupae, moulting insects, scale insects and aphids. Many are scavengers and consume various organic remains, decaying plants, seedlings and fungi. In captivity, many species have been successfully reared on a diet of ground up, commercial dry dog food, supplemented with lettuce and aphids.
Crickets have relatively powerful jaws, and several species have been known to bite humans.
Reproduction and life-cycle
Male crickets establish their dominance over each other by aggression. They start by lashing each other with their antennae and flaring their mandibles. Unless one retreats at this stage, they resort to grappling, at the same time each emitting calls that are quite unlike those uttered in other circumstances. When one achieves dominance, it sings loudly while the loser remains silent.
Females are generally attracted to males by their calls, though in non-stridulatory species, some other mechanism must be involved. After the pair have made antennal contact, there may be a courtship period during which the character of the call changes. The female mounts the male and a single spermatophore is transferred to the external genitalia of the female. Sperm flows from this into the female's oviduct over a period of a few minutes or up to an hour, depending on species. After copulation the female may remove or eat the spermatophore; males may attempt to prevent this with various ritualised behaviours. The female may mate on several occasions with different males.
Most crickets lay their eggs in the soil or inside the stems of plants, and to do this, female crickets have a long needle-like or scabre-like egg-laying organ called an ovipositor. Some ground-dwelling species have dispensed with this, either depositing their eggs in an underground chamber or pushing them into the wall of a burrow. The short-tailed cricket (Anurogryllus) excavates a burrow with chambers and a defecating area, lays its eggs in a pile on a chamber floor, and after the eggs have hatched, feeds the juveniles for about a month.
Crickets are hemimetabolic insects, whose life cycle consists of an egg stage, a larval or nymph stage that increasingly resembles the adult form as the nymph grows, and an adult stage. The egg hatches into a nymph about the size of a fruit fly. This passes through about ten larval stages, and with each successive moult it become more like an adult. After the final moult, the genitalia and wings are fully developed, but a period of maturation is needed before the cricket is ready to breed.
Female Teleogryllus oceanicus crickets from natural populations mate polyandrously and store sperm from multiple males. Female crickets exert a post-copulatory fertilization bias in favour of unrelated males to avoid the genetic consequences of inbreeding. Fertilization bias depends on the control of sperm transport to the sperm storage organs. The inhibition of sperm storage by female crickets can act as a form of cryptic female choice to avoid the severe negative effects of inbreeding.
In controlled breeding experiments with the cricket Gryllus firmus, seven inbred lines were tested, and it was found that during fourteen generations of brother–sister matings nymphal weight and early fecundity declined substantially. This observed inbreeding depression appeared to be due to an increased frequency of homozygous combinations of deleterious recessive alleles generated by the inbreeding (thereby decreasing fitness). These results support the general idea that the principal benefit of outcrossing is the masking of deleterious recessive alleles by wild-type alleles.
Predators, parasites and pathogens
Crickets have many natural enemies and are subject to various pathogens and parasites. They are eaten by large numbers of vertebrate and invertebrate predators and their hard parts are often found when the contents of animal's guts are examined. Mediterranean house geckos (Hemidactylus turcicus) have learned that although a calling decorated cricket (Gryllodes supplicans) may be safely-positioned out-of-reach in a burrow, female crickets attracted to the call can be intercepted and eaten.
The entomopathogenic fungus Metarhizium anisopliae attacks and kills crickets and has been used as the basis of control in pest populations. The insects are also affected by the cricket paralysis virus, which has caused high levels of fatalities in cricket-rearing facilities. Other fatal diseases that have been identified in mass-rearing establishments include Rickettsia and three further viruses. The diseases may spread more rapidly if the crickets become cannibalistic and eat the corpses.
Red parasitic mites sometimes attach themselves to the dorsal region of crickets and may greatly affect them. The horsehair worm Paragordius varius is an internal parasite and can control the behaviour of its cricket host and cause it to enter water, where the parasite continues its lifecycle and the cricket likely drowns. The larvae of the sarcophagid fly Sarcophaga kellyi develop inside the body cavity of field crickets. Female parasitic wasps Rhopalosoma lay their eggs on crickets, and their developing larvae gradually devour their hosts. Other wasps in the family Scelionidae are egg parasitoids, seeking out batches of eggs laid by crickets in plant tissues in which to insert their eggs. 
The fly Ormia ochracea has very acute hearing and targets calling male crickets. It locates its prey by ear and then lays its eggs nearby. The developing larvae burrow inside any crickets with which they come in contact and in the course of a week or so, devour what remains of the host before pupating. In Florida it was found that the parasitic flies were only present in the autumn and that at that time of year the males sang less but for longer periods. There is a trade-off for the male between attracting females and being parasitized.
Phylogeny and taxonomy
The phylogenetic relationships of the Gryllidae, summarized by Darryl Gwynne in 1995 from his own work (using mainly anatomical characteristics) and that of earlier authors,[a] are shown in the following cladogram, with the Orthoptera divided into two main groups, Ensifera (crickets sensu lato) and Caelifera (grasshoppers). Fossil Ensifera are found from the late Carboniferous period (300 Mya) onwards, and the true crickets, Gryllidae, from the Triassic period (250 to 200 Mya).
Cladogram after Gwynne, 1995:
A phylogenetic study by Jost & Shaw in 2006 using sequences from 18S, 28S, and 16S rRNA supported the monophyly of Ensifera. Most ensiferan families were also found to be monophyletic, and the superfamily Gryllacridoidea was found to include Stenopelmatidae, Anostostomatidae, Gryllacrididae and Lezina. Schizodactylidae and Grylloidea were shown to be sister taxa, and Rhaphidophoridae and Tettigoniidae were found to be more closely related to Grylloidea than had previously been thought. The authors stated that "a high degree of conflict exists between the molecular and morphological data, possibly indicating that much homoplasy is present in Ensifera, particularly in acoustic structures." They considered that tegmen stridulation and tibial tympanae are ancestral to Ensifera and have been lost on multiple occasions, especially within the Gryllidae.
In human culture
Folklore and myth
The folklore and mythology surrounding crickets is extensive. The singing of crickets in the folklore of Brazil and elsewhere is sometimes taken to be a sign of impending rain, or of a financial windfall. In Álvar Núñez Cabeza de Vaca's chronicles of the Spanish conquest of the Americas, the sudden chirping of a cricket heralded the sighting of land for his crew, just as their water supply had run out. In Caraguatatuba, Brazil, a black cricket in a room is said to portend illness; a gray one, money; and a green one, hope. In Alagoas state, northeast Brazil, a cricket announces death, thus it is killed if it chirps in a house. In Barbados, a loud cricket means money is coming in; hence, a cricket must not be killed or evicted if it chirps inside a house. However, another type of cricket that is less noisy forebodes illness or death.
Crickets feature as major characters in novels and children's books. Charles Dickens's 1845 novella The Cricket on the Hearth, divided into sections called "Chirps", tells the story of a cricket which chirps on the hearth and acts as a guardian angel to a family. Carlo Collodi's 1883 children's book "Le avventure di Pinocchio" (The Adventures of Pinocchio) featured "Il Grillo Parlante" (The Talking Cricket) as one of its characters. George Selden's 1960 children's book The Cricket in Times Square tells the story of Chester the cricket from Connecticut who joins a family and their other animals, and is taken to see Times Square in New York. The story, which won the Newbery Honor, came to Selden on hearing a real cricket chirp in Times Square.
The French entomologist Jean-Henri Fabre's popular Souvenirs Entomoloqiques devotes a whole chapter to the cricket, discussing its construction of a burrow and its song-making. The account is mainly of the field cricket but also mentions the Italian cricket.
Crickets have from time to time appeared in poetry. William Wordsworth's 1805 poem The Cottager to Her Infant includes the couplet "The kitten sleeps upon the hearth, The crickets long have ceased their mirth". John Keats's 1819 poem Ode to Autumn includes the lines "Hedge-crickets sing; and now with treble soft / The redbreast whistles from a garden-croft". The Chinese Tang dynasty poet Du Fu (712–770) wrote a poem that in the translation by J. P. Seaton begins "House cricket... Trifling thing. And yet how his mournful song moves us. Out in the grass his cry was a tremble, But now, he trills beneath our bed, to share his sorrow."
As pets and fighting animals
Crickets are kept as pets and are considered good luck in some countries; in China, they are sometimes kept in cages or in hollowed-out gourds specially created in novel shapes. It is also common to have them as caged pets in some European countries, particularly in the Iberian Peninsula. Cricket fighting is a traditional Chinese pastime that dates back to the Tang dynasty (618–907). Originally an indulgence of emperors, cricket fighting later became popular among commoners. The dominance and fighting ability of males does not depend on strength alone; it has been found that they become more aggressive after certain pre-fight experiences such as isolation, or when defending a refuge. Crickets forced to fly for a short while will afterwards fight for two to three times longer than they otherwise would.
In the southern part of Asia including Vietnam, crickets are commonly eaten as a snack, prepared by deep frying the soaked and cleaned insects. The food conversion efficiency of house crickets (Acheta domesticus) is reported to be five times higher than that for beef cattle, and if their fecundity is taken into account, fifteen to twenty times higher.
In the United States of America, farmed crickets are being incorporated into protein bars, baked goods, and protein powders aimed at consumers interested in losing weight or in reducing harm to the environment.
Crickets are reared on a large scale as food for carnivorous zoo and laboratory animals; they may be "gut loaded" with additional minerals, such as calcium, to provide a balanced diet for predators such as tree frogs (Hylidae).
In popular culture
Cricket characters feature in the Walt Disney animated movies Pinocchio (1940), where Jiminy Cricket becomes the title character's conscience, and in Mulan (1998), where Cri-kee is carried in a cage as a symbol of luck, in the Asian manner. The Crickets was the name of Buddy Holly's rock and roll band; Holly's home town baseball team in the 1990s was called the Lubbock Crickets. Cricket is the name of a US children's literary magazine founded in 1973; it uses a cast of insect characters. The sound of crickets is often used in media to emphasize silence, often for comic effect after an awkward joke, in a similar manner to tumbleweed.
- Gwynne cites Ander 1939, Zeuner 1939, Judd 1947, Key 1970, Ragge 1977 and Rentz 1991 as supporting the two-part scheme (Ensifera, Caelifera) in his 1995 paper.
- Some groups in the Ensifera may be called crickets sensu lato, including the Rhaphidophoridae –Cave or camel crickets; Stenopelmatidae – Jerusalem or sand crickets; Mogoplistidae – scaly crickets; Gryllotalpidae – Mole crickets; Anabrus – Mormon crickets; Myrmecophilidae – ant crickets; and Tettigoniidae – katydids or bush crickets.
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