Wart-biter

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Wart-biter
Decticus verrucivorus (42083043185).jpg
Adult female of the green morph
Decticus verrucivorus male (3788390082).jpg
male
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Orthoptera
Suborder: Ensifera
Family: Tettigoniidae
Subfamily: Tettigoniinae
Tribe: Decticini
Genus: Decticus
Species:
D. verrucivorus
Binomial name
Decticus verrucivorus
Close-Up of a Decticus verrucivorus

The wart-biter (Decticus verrucivorus) [1] is a bush-cricket in the family Tettigoniidae. Its common and scientific names derive from the eighteenth-century Swedish practice of allowing the crickets to nibble at warts to remove them. [2]

Contents

Description

Adult wart-biters are 31–37 millimetres (1.2–1.5 in), with females being significantly larger than males. They are typically dark green in colour, usually with dark brown blotches on the pronotum and wings (a dark brown morphotype also occurs). The female has a long and slightly upcurved ovipositor. [3]

The wart-biter has a song consisting of a rapidly repeated series of short bursts of clicks, sometimes lasting for several minutes.

Wart-biters normally move about by walking; they rarely fly, except when frightened. Most can only fly 3 to 4 metres (10 to 13 ft) at a time.

Subspecies

The Orthoptera Species File [4] lists:

Habitat

The species is found in calcareous grassland and heathland habitats. [3]

Wart-biters need a mosaic of vegetation, including bare ground/short turf, grass tussocks, and a sward rich in flowering forbs. They prefer areas that are not heavily grazed. The species is thermophilous, and tends to occur on sites with a southerly aspect. [5]

Diet

The species is omnivorous. Plants eaten include knapweed, nettles, bedstraws; the species also eats insects, including other grasshoppers. Despite its name, the eponymous warts are not a major part of its diet.

Life cycle

The wart-biter lays its eggs in the soil; these eggs normally hatch after two winters. It then passes through seven instar stages between April and June. The adult stage is reached in the beginning of July. Wart-biter populations peak in late July and early August. [3] Newly hatched Decticus are encased in a sheath to facilitate their trip to the soil surface, the sheath holding the legs and antennae safely against the body while burrowing upwards. A neck which can in turn be inflated and deflated, enlarges the top of its tunnel, easing its passage upwards. [6]

Status and distribution

This species occurs throughout continental Europe, except the extreme south, ranging from southern Scandinavia to Portugal, Spain, Italy, and Greece. It is also found in temperate Asia, as far east as China. Geographic features such as mountains have fragmented the species, leading to a wide range of forms and numerous subspecies. [7]

In Britain, the wart-biter is confined to five sites, two in East Sussex, and one each in Wiltshire, Essex, Dorset and Kent. [3]

Conservation

The population of wart-biters has declined in many areas of northern Europe. In Britain, it is threatened with extirpation. [8] The species is the subject of a United Kingdom Biodiversity Action Plan. [9]

Related Research Articles

<span class="mw-page-title-main">Tettigoniidae</span> Family of insects

Insects in the family Tettigoniidae are commonly called katydids or bush crickets. They have previously been known as "long-horned grasshoppers". More than 8,000 species are known. Part of the suborder Ensifera, the Tettigoniidae are the only extant (living) family in the superfamily Tettigonioidea.

<span class="mw-page-title-main">Orthoptera</span> Order of insects including grasshoppers, crickets, wētā and locusts

Orthoptera is an order of insects that comprises the grasshoppers, locusts, and crickets, 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.

<span class="mw-page-title-main">Ensifera</span> Suborder of cricket-like animals

Ensifera is a suborder of insects that includes the various types of crickets and their allies including: true crickets, camel crickets, bush crickets or katydids, grigs, weta and Cooloola monsters. This and the suborder Caelifera make up the order Orthoptera. Ensifera is believed to be a more ancient group than Caelifera, with its origins in the Carboniferous period, the split having occurred at the end of the Permian period. Unlike the Caelifera, the Ensifera contain numerous members that are partially carnivorous, feeding on other insects, as well as plants.

<span class="mw-page-title-main">Roesel's bush-cricket</span> Species of cricket-like animal

Roesel's bush-cricket, Roeseliana roeselii is a European bush-cricket, named after August Johann Rösel von Rosenhof, a German entomologist.

<span class="mw-page-title-main">Speckled bush-cricket</span> Species of cricket-like animal

The speckled bush-cricket is a flightless species of bush-cricket belonging to the family Tettigoniidae. The species was originally described as Locusta punctatissima in 1792.

<i>Saga pedo</i> Species of cricket-like animal

Saga pedo is a species of wingless bush cricket from the southern half of Europe and western and central Asia. This brown or green bush cricket typically has a total length, from the head to the tip of the ovipositor, of up to 10.5 cm (4.1 in), but exceptionally it may reach 12 cm (4.7 in), which makes it one of the largest European insects and one of the world's largest Orthoptera. The head-and-body alone typically is 5–7 cm (2.0–2.8 in) long in adults, but may reach up to 7.8 cm (3.1 in).

Orthopteroids are insects which historically would have been included in the order Orthoptera and now may be placed in the Polyneoptera. When Carl Linnaeus started applying binomial names to animals in the 10th edition of his Systema Naturae in 1758, there were few animals included in the scheme, and consequently few groups. As more and more new species were discovered and differences recognised, the original groups proposed by Linnaeus were split up.

<i>Saga hellenica</i> Species of cricket

Saga hellenica is a large species of bush cricket or katydid in the family Tettigoniidae. It is endemic to the Balkans, living in Albania, North Macedonia, Greece and in the past also in western Bulgaria, where it occurred on shrubs and more rarely in the grass in open stony terrains and light xerophytic forests.

<span class="mw-page-title-main">Nsenene</span> Species of cricket-like animal

Nsenene is the Luganda name for Ruspolia differens: a bush cricket in the tribe Copiphorini of the 'cone-head' subfamily. It is often confused with the closely related Ruspolia nitidula.

<i>Eugaster spinulosa</i> Species of cricket-like animal

Eugaster spinulosa, a species of bush-cricket from Morocco.

<i>Tettigonia</i> Genus of cricket-like animals

Tettigonia is the type genus of bush crickets belonging to the subfamily Tettigoniinae. The scientific name Tettigonia is onomatopoeic and derives from the Greek τεττιξ, meaning cicada.

<i>Conocephalus fuscus</i> Species of cricket-like animal

Conocephalus fuscus, the long-winged conehead, is a member of the family Tettigoniidae, the bush-crickets and is distributed through much of Europe and temperate Asia. This bush-cricket is native to the British Isles where it may confused with the short-winged conehead. These two species are phenotypically similar; however, the distinguishing factor between the two is the fully developed set of wings the long-winged conehead possesses that allows for flight. In the short-winged coneheads the hind wings are shorter than the abdomen, causing the wings to be vestigial and the species is incapable of flight. For this reason it is hard to discriminate between the two species during the early stages of their life cycle before the wings have fully developed. The colouration of the conehead is typically a grass green with a distinctive brown stripe down its back, though there are some brown phenotypes.

<i>Aularches</i> Genus of grasshopper

Aularches miliaris is a grasshopper species of the monotypic genus Aularches, belonging to the family Pyrgomorphidae. A native of South and Southeast Asia, the bright warning colours of this fairly large grasshopper keep away predators and their defense when disturbed includes the ejection of a toxic foam.

<i>Decticus</i> Genus of cricket-like animals

Decticus is the "wart-biter" genus of bush-crickets in the subfamily Tettigoniinae; it is the sole genus in the monotypic tribe DecticiniHerman, 1874.

<i>Ruspolia nitidula</i> Species of cricket

Ruspolia nitidula, the Large Conehead, is a species belonging to the subfamily Conocephalinae of the family Tettigoniidae. It is found throughout Europe, Africa, and the Palearctic part of Asia. A vernacular name that has been used is "cone-headed grasshopper", although it is not a grasshopper, but rather a bush cricket.

<i>Ephippiger terrestris</i> Species of cricket-like animal

Ephippiger terrestris, common name Alpine saddle-backed bush-cricket, is a bush cricket species belonging to the family Tettigoniidae, subfamily Bradyporinae.

Karim Vahed FRES is a British entomologist. He is a professor of entomology and England manager at invertebrate conservation charity Buglife, and is an expert in crickets and bushcrickets (katydids).

<i>Tropidacris cristata</i> Species of grasshopper

Tropidacris cristata, the giant red-winged grasshopper, is a widespread species of lubber grasshopper in the family Romaleidae from tropical South and Central America, and Mexico. It is among the largest grasshoppers in the world by length and wingspan, reaching up to 14.5 cm (5.7 in) and 24 cm (9.4 in) respectively. More typical adult lengths are 5.5–7 cm (2.2–2.8 in), average 6.5 cm (2.6 in), in males and 7–12 cm (2.8–4.7 in), average 11 cm (4.3 in), in females. As suggested by the common name, adult T. cristata have conspicuously red wings in flight, although the exact red hue varies. The flightless and gregarious nymphs have aposematic dark-and-yellow stripes and are presumed to be toxic.

References

  1. "Wart-biter bush-cricket | Buglife". www.buglife.org.uk.
  2. "Rare wart-biter cricket's powers put to the test". BBC News. Retrieved 9 August 2020.
  3. 1 2 3 4 Judith A. Marshall & E. C. M. Hayes (1988). Grasshopper and allied insects of Great Britain and Ireland. Harley Books. ISBN   0-946589-36-4.
  4. Orthoptera Species File: species Decticus verrucivorus (Linnaeus, 1758) (Version 5.0/5.0 retrieved 8 February 2021)
  5. Dag Øystein Hjermann & Rolf Anker Ims (1996). "Landscape ecology of the wart-biter Decticus verrucivorus in a patchy landscape". Journal of Animal Ecology . British Ecological Society. 65 (6): 768–780. doi:10.2307/5675. JSTOR   5675.
  6. Jean-Henri Fabre - "Book of Insects"
  7. M. J. Samways & K. Harz (1982). "Biogeography of intraspecific morphological variation in the bush crickets Decticus verrucivorus (L.) and D. albifrons (F.) (Orthoptera: Tettigoniidae)". Journal of Biogeography . Blackwell Publishing. 9 (3): 243–254. doi:10.2307/2844667. JSTOR   2844667.
  8. Andrew A. Cunningham; J. Mick Frank; Pat Croft; Dave Clarke & Paul Pearce-Kelly (1997). "Mortality of captive British wartbiter crickets: implications for reintroduction programs" (PDF). Journal of Wildlife Diseases . 33 (3): 673–676. doi: 10.7589/0090-3558-33.3.673 . PMID   9249724.
  9. "United Kingdom Biodiversity Action Plan for the Wart-biter". Archived from the original on 2006-06-21. Retrieved 2006-07-22.