Orthoptera () is an

order Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects are recognized, differentiated, and understood * Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ...

of insects that comprises the

grasshopper Grasshoppers are a group of insects belonging to the suborder Caelifera. They are among what is possibly the most ancient living group of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago. Grasshopp ...

s, locusts, and

cricket Cricket is a bat-and-ball game played between two teams of eleven players on a field at the centre of which is a pitch with a wicket at each end, each comprising two bails balanced on three stumps. The batting side scores runs by striki ...

s, including closely related insects, such as the bush crickets or katydids and wētā. The order is subdivided into two suborders: Caelifera – grasshoppers, locusts, and close relatives; and Ensifera – crickets and close relatives. More than 20,000 species are distributed worldwide. The insects in the order have incomplete metamorphosis, and produce sound (known as a " stridulation") by rubbing their wings against each other or their legs, the wings or legs containing rows of corrugated bumps. The tympanum, or ear, is located in the front tibia in crickets, mole crickets, and bush crickets or katydids, and on the first abdominal segment in the grasshoppers and locusts. These organisms use vibrations to locate other individuals. Grasshoppers and other orthopterans are able to fold their wings (i.e. they are members of Neoptera).

Etymology

The name is derived from the Greek ὀρθός ''orthos'' meaning "straight" and πτερόν ''pteron'' meaning "wing".

Characteristics

Orthopterans have a generally

cylindrical A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infini ...

body, with elongated hindlegs and musculature adapted for jumping. They have mandibulate mouthparts for biting and chewing and large compound eyes, and may or may not have ocelli, depending on the species. The antennae have multiple joints and filiform type, and are of variable length. The first and third segments on the thorax are larger, while the second segment is much smaller. They have two pairs of wings, which are held overlapping the abdomen at rest. The forewings, or tegmina, are narrower than the hindwings and hardened at the base, while the hindwings are membranous, with straight veins and numerous cross-veins. At rest, the hindwings are held folded fan-like under the forewings. The final two to three segments of the abdomen are reduced, and have single-segmented cerci.

Life cycle

Orthopterans have a paurometabolous lifecycle or incomplete metamorphosis. The use of sound is generally crucial in courtship, and most species have distinct songs. Most grasshoppers lay their eggs in the ground or on vegetation. The eggs hatch and the young nymphs resemble adults, but lack wings and at this stage are often called 'hoppers'. They may often also have a radically different coloration from the adults. Through successive moults, the nymphs develop wings until their final moult into a mature adult with fully developed wings. The number of moults varies between species; growth is also very variable and may take a few weeks to some months depending on food availability and weather conditions.

Evolution

This order evolved with a division into two suborders - Caelifera and Ensifera - occurring .Chang H, Qiu Z, Yuan H, Wang X, Li X, Sun H, Guo X, Lu Y, Feng X, Majid M, Huang Y (2020) Evolutionary rates of and selective constraints on the mitochondrial genomes of Orthoptera insects with different wing types. Mol Phylogenet Evol

Phylogeny

The Orthoptera are divided into two suborders, Caelifera and Ensifera, that have been shown to be

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

.Zhou Z, Ye H, Huang Y, Shi F. (2010) The phylogeny of Orthoptera inferred from mtDNA and description of ''Elimaea cheni'' (Tettigoniidae: Phaneropterinae) mitogenome. ''J. Genet. Genomics.'' 37(5):315-324

Taxonomy

Variegated grasshopper (Zonocerus variegatus)

Taxonomists classify members of the Caelifera and Ensifera into infraorders and superfamilies as follows: * Suborder Caelifera – grasshoppers, pygmy mole crickets and allies ** Infraorder Acrididea *** Superfamily Acridoidea – grasshoppers, locusts *** Superfamily Eumastacoidea – monkey or matchstick grasshoppers and allies *** Superfamily Locustopsoidea† *** Superfamily Pneumoroidea – bladder grasshoppers *** Superfamily Pyrgomorphoidea – gaudy grasshoppers *** Superfamily Tanaoceroidea – desert long-horned grasshoppers *** Superfamily Tetrigoidea – ground-hoppers or grouse locusts *** Superfamily Trigonopterygoidea – leaf grasshoppers ** Infraorder

Tridactylidea The infraorder Tridactylidea has a single extant superfamily which includes pygmy mole crickets; they are thought to represent living representatives of the most basal Caelifera: the Orthopteran suborder that includes grasshoppers. Superfami ...

*** Superfamily Dzhajloutshelloidea† *** Superfamily Regiatoidea† *** Superfamily

Tridactyloidea Tridactyloidea is a superfamily in the order Orthoptera. The insects are sometimes known as pygmy mole crickets but they are Caelifera and not members of the mole cricket suborder Ensifera, unlike the true mole crickets, the Gryllotalpidae ...

– pygmy mole crickets and allies * Suborder Ensifera – crickets ** Superfamily Grylloidea – crickets, mole crickets ** Superfamily

Hagloidea The superfamily Hagloidea are insects belonging to the order Orthoptera: Ensifera; they are now represented by the extant Prophalangopsidae, with many extinct genera and families (see below). Families * † Eospilopteronidae * † Haglidae * � ...

– grigs and allies ** Superfamily Phasmomimoidea† ** Superfamily Rhaphidophoroidea – camel crickets, cave crickets, cave wētā ** Superfamily Schizodactyloidea – dune crickets ** Superfamily Stenopelmatoidea – wētā and allies ** Superfamily Tettigonioidea – katydids / bush crickets *''Incertae sedis'' **Superfamily Elcanoidea† Permian- Paleocene

Relationships with humans

As pests

Several species of Orthoptera are considered pests of crops and rangelands or seeking warmth in homes by humans. The two groups of Orthoptera that cause the most damage are

s and locusts. Locust are historically known for wiping out fields of crops in a day. Locust have the ability to eat up to their own body weight in a single day. Individuals gather in large groups called swarms, these swarms can range up to 80 million individuals that stretch 460 square miles. Grasshoppers can cause major agricultural damage but not to the documented extent as locust historically have. These insects mainly feed on weeds and grasses, however, during times of drought and high population density they will feed on crops. They are known pest in soybean fields and will likely feed on these crops once preferred food sources have become scarce.

As food

Most orthopterans are edible, making up 13% of all insects including some 80 species of grasshoppers being regularly consumed worldwide. In Madagascar and Oaxaca, grasshoppers and locusts are usually collected early in the morning when it is cooler as the orthopterans are less mobile due to being cold-blooded. In Thailand, house crickets are commonly reared and eaten; as of 2012, around 20,000 cricket farmers had farms in 53 of their 76 provinces. In the second century BCE in Ancient Greece,

Diodorus Siculus Diodorus Siculus, or Diodorus of Sicily ( grc-gre, Διόδωρος ; 1st century BC), was an ancient Greek historian. He is known for writing the monumental universal history ''Bibliotheca historica'', in forty books, fifteen of which su ...

is known to have called people from Ethiopia ''Acridophagi'', meaning "eaters of locusts." In Judaism, the Orthoptera include the only insects considered

kosher (also or , ) is a set of dietary laws dealing with the foods that Jewish people are permitted to eat and how those foods must be prepared according to Jewish law. Food that may be consumed is deemed kosher ( in English, yi, כּשר), fro ...

. The list of dietary laws in the book of Leviticus forbids all flying insects that walk, but makes an exception for certain locusts. Notably, the

dragonfly A dragonfly is a flying insect belonging to the infraorder Anisoptera below the order Odonata. About 3,000 extant species of true dragonfly are known. Most are tropical, with fewer species in temperate regions. Loss of wetland habitat threate ...

and crane fly are not considered kosher even though they are helpless when unable to fly. The Torah states the only kosher flying insects with four walking legs have knees that extend above their feet so that they hop.

As creators of biofuel

With new research showing promise in locating alternative

biofuel Biofuel is a fuel that is produced over a short time span from biomass, rather than by the very slow natural processes involved in the formation of fossil fuels, such as oil. According to the United States Energy Information Administration (E ...

sources in the gut of insects, grasshoppers are one species of interest. The insect's ability to break down cellulose and

lignin Lignin is a class of complex organic polymers that form key structural materials in the support tissues of most plants. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity ...

without producing greenhouse gases has aroused scientific interest.

References

External links

Orthoptera Species File OnlineOrthoptera Image Gallery (Iowa State University Entomology Department)Australian Plague Locust CommissionThe Orthopterists' SocietyAcridAfrica, les acridiens d'Afrique de l'Ouest
*
Birdwing Grasshoppers in BelizeSound recordings of Orthoptera at BioAcoustica
{{Authority control Insect orders Edible insects Carboniferous first appearances Taxa named by Pierre André Latreille Orthopterida