Orthoptera () is an order of

insect Insects (from Latin ') are Hexapoda, hexapod invertebrates of the class (biology), class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (Insect morphology#Head, head, ...

s that comprises the grasshoppers, locusts, and

cricket Cricket is a Bat-and-ball games, bat-and-ball game played between two Sports team, teams of eleven players on a cricket field, field, at the centre of which is a cricket pitch, pitch with a wicket at each end, each comprising two Bail (cr ...

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 A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

are distributed worldwide. The insects in the order have incomplete metamorphosis, and produce

sound In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the ''reception'' of such waves and their ''perception'' by the br ...

(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 meaning "straight" and ' meaning "wing".

Characteristics

Orthopterans have a generally cylindrical body, with elongated hindlegs and musculature adapted for jumping. They have mandibulate mouthparts for biting and chewing and large

compound eye A compound eye is a Eye, visual organ found in arthropods such as insects and crustaceans. It may consist of thousands of ommatidium, ommatidia, which are tiny independent photoreception units that consist of a cornea, lens (anatomy), lens, and p ...

s, 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 The abdomen (colloquially called the gut, belly, tummy, midriff, tucky, or stomach) is the front part of the torso between the thorax (chest) and pelvis in humans and in other vertebrates. The area occupied by the abdomen is called the abdominal ...

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 biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...

.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 A recent comprehensive phylogeny based on analyses of data from transcriptomes and mitochondrial genomes found the following relationships within Orthoptera. ;Notes

Taxonomy

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 *** Superfamily Dzhajloutshelloidea† *** Superfamily Regiatoidea† *** Superfamily Tridactyloidea – pygmy mole crickets and allies * Suborder Ensifera – crickets ** Superfamily Grylloidea – crickets ** Superfamily Gryllotalpoidea – mole crickets and ant crickets ** Superfamily Hagloidea – 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 The Permian ( ) is a geologic period and System (stratigraphy), stratigraphic system which spans 47 million years, from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.902 Mya. It is the s ...

Paleocene The Paleocene ( ), or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), ...

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 grasshoppers and locusts. Locusts are historically known for wiping out fields of crops in a day. Locusts have the ability to eat up to their own body weight in a single day. Individuals gather in large groups called swarms, consisting of up to 80 million individuals and spanning as much as 460 square miles. Grasshoppers can cause major agricultural damage but not to the documented extent as locusts 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 a 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

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and

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, 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 Ancient Greece () was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity (), that comprised a loose collection of culturally and linguistically r ...

, Diodorus Siculus is known to have called people from

Ethiopia Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa region of East Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east, Ken ...

''Acridophagi'', meaning "eaters of locusts." In Judaism, the Orthoptera include the only insects considered kosher. The list of dietary laws in the book of Leviticus forbids all flying insects that walk, but makes an exception for certain locusts. 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 sources in the gut of insects, grasshoppers are one species of interest. The insect's ability to break down cellulose and lignin 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