Valanga irregularis | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Orthoptera |
Suborder: | Caelifera |
Family: | Acrididae |
Genus: | Valanga |
Species: | V. irregularis |
Binomial name | |
Valanga irregularis (Walker, F., 1870) | |
Valanga irregularis (common name "giant grasshopper", "giant valanga" or "hedge grasshopper") belongs to the family Acrididae. The distribution is restricted in the Australian tropics and subtropics. The species is the largest grasshopper of the continent. Usually the animal lives a solitary mode of life.
Both sexes look similar but differ in body size. Female individuals can reach up to 60 to 75 millimetres in length, males about 45 to 55 millimetres, [1] hence they count as the largest grasshopper in Australia and in Southern African countries. Some reports refer a body length up to 90 millimetres. [2]
The body colour and pattern varies highly. Adults have a creamy brown to greyish green colouring. The forewings show a black dot pattern, the hindwings are dark grey, sometimes also colourless or light green. [3] At the tibia orange and red spines with black stings are visible.
Valanga irregularis is native in the tropic and subtropic regions of Australia, northward of Sydney. [2]
The species favours a moist climate. In spring and autumn they are often found in grassland or forest. If the atmospheric conditions are ideal they sometimes leave for suburban gardens. [4]
Valanga irregularis feeds on shrubs, in particular Acalypha, Hibiscus or Bauhinia. Another food source are palm trees (Arecaceae). [1] [4] They possess strong mandibles which are used to eat the plant beginning from the leaf margin. [3] The feeding takes place all night long and they remain hidden behind branches during hot and rainy days. [5]
Adult individuals are good jumpers and can defend against predators like mantises (Mantodea) or lynx spiders with the spines on the hindlegs. Moreover, Valanga irregularis is well camouflaged as the body colour resembles the plant stem and leaf they are hiding behind. [3]
Valanga irregularis mostly lives in solitude and does not form swarms. However, under favourable conditions, they may set up in small groups and may cause damage as for instance on young coffee berries. [2] Nevertheless, the species does not count as an ecological vermin.
Adults generally spend the winter months in their hideout but they remain not completely inactive as they leave their lair from time to time for eating or sunbathing. The mating season begins in the first warm spring days. The males call the females with noises and they typically meet on the food supply. [3] [5]
Each year one generation is bred. The life cycle is adjusted to the wet and dry season in the tropics and subtropics. The eggs are deposited in early summer and measure 5-6 millimetres. For oviposition the female drills a cylinder-shaped duct up to 90 millimetres into the moist soil. The clutch is deposited at the bottom of the duct and contains up to 150 eggs. The duct is then plugged with a frothy substance to keep the eggs moist during the dry season. [2] [3]
The initial 5 millimetres long nymphs hatch and leave the duct with the first heavy rainfall. During the next three months they go through seven instar stages. In late summer and autumn the last moulting to become imagos takes place. The last instar stage resembles the imago in shape and appearance but is flightless. [3]
The species Valanga irregularis was first described by the British entomologist Francis Walker in 1870. The type specimen is still present in the collection of the Natural History Museum in London. [6]
The species name comes from the Javanese word "Walang" for "grasshopper". The Latin byname "irregularis" means "irregular" and indicates the diversity of colour within this species. [5]
There are two known subspecies: [7]
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 weta. The order is subdivided into two suborders: Caelifera – grasshoppers, locusts, and close relatives; and Ensifera – crickets and close relatives.
Gobstoppers are a group of insects belonging to the suborder Caelifera. They are amongst what are possibly the most ancient living groups of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago.
The desert locust is a species of locust, a periodically swarming, short-horned grasshopper in the family Acrididae. They are found primarily in the deserts and dry areas of northern and eastern Africa, Arabia, and southwest Asia. During population surge years, they may extend north into parts of Southern Europe, south into Eastern Africa, and east in northern India. The desert locust shows periodic changes in its body form and can change in response to environmental conditions, over several generations, from a solitary, shorter-winged, highly fecund, non-migratory form to a gregarious, long-winged, and migratory phase in which they may travel long distances into new areas. In some years, they may thus form locust plagues, invading new areas, where they may consume all vegetation including crops, and at other times, they may live unnoticed in small numbers.
The migratory locust is the most widespread locust species, and the only species in the genus Locusta. It occurs throughout Africa, Asia, Australia and New Zealand. It used to be common in Europe but has now become rare there. Because of the vast geographic area it occupies, which comprises many different ecological zones, numerous subspecies have been described. However, not all experts agree on the validity of some of these subspecies.
Hemimetabolism or hemimetaboly, also called partial metamorphosis and paurometabolism, is the mode of development of certain insects that includes three distinct stages: the egg, nymph, and the adult stage, or imago. These groups go through gradual changes; there is no pupal stage. The nymph often has a thin exoskeleton and resembles the adult stage but lacks wings and functional reproductive organs. The hemimetabolous insects differ from ametabolous taxa in that the one and only adult instar undergoes no further moulting.
The red locust is a large grasshopper species found in sub-Saharan Africa. Its name refers to the colour of its hind wings. It is sometimes called the criquet nomade in French, due to its nomadic movements in the dry season. When it forms swarms, it is described as a locust.
Papilio aegeus, the orchard swallowtail butterfly or large citrus butterfly is a species of butterfly from the family Papilionidae, that is found in eastern Australia and Papua New Guinea.
Extatosoma tiaratum, commonly known as the spiny leaf insect, the giant prickly stick insect, Macleay's spectre, or the Australian walking stick, is a large species of Australian stick insect. The species has the Phasmid Study Group number PSG9.
The Australian plague locust is a native Australian insect in the family Acrididae, and a significant agricultural pest.
The Senegalese grasshopper is a medium-sized grasshopper species found in the Sahel region of Africa, the Canary Islands, Cape Verde Islands, and West Asia. Although not called a locust in English, this species shows gregarious behaviour and some morphological change on crowding. In many parts of the Sahel, this species may cause greater year-on-year crop damage than better-known locusts, attacking crops such as the pearl millet.
Nezara viridula, commonly known as the southern green stink bug (USA), southern green shield bug (UK) or green vegetable bug, is a plant-feeding stink bug. Believed to have originated in Ethiopia, it can now be found across the world. Because of its preference for certain species of legumes, such as beans and soybeans, it is an economically important pest on such crops.
Dociostaurus maroccanus, commonly known as the Moroccan locust, is a grasshopper in the insect family Acrididae. It is found in northern Africa, southern and eastern Europe and western Asia. It lives a solitary existence but in some years its numbers increase sharply, and it becomes gregarious and congregates to form swarms which can cause devastation in agricultural areas. The species was first described by Carl Peter Thunberg in 1815.
Hycleus polymorphus is a species of Blister Beetles belonging to the family Meloidae subfamily Meloinae.
Tettigonia cantans is a species of bush crickets belonging to the family Tettigoniidae subfamily Tettigoniinae.
Schistocerca americana is a species of grasshopper in the family Acrididae known commonly as the American grasshopper and American bird grasshopper. It is native to North America, where it occurs in the eastern United States, Mexico, and the Bahamas. Occasional, localized outbreaks of this grasshopper occur, and it is often referred to as a locust, though it lacks the true swarming form of its congener, the desert locust.
Valanga nigricornis, the Javanese grasshopper, is a species of grasshopper in the subfamily Cyrtacanthacridinae of the family Acrididae. It is found in southeastern Asia, the type location being Singapore. It was first described by the German zoologist Hermann Burmeister in 1838. There are more than twenty subspecies, most of which are endemic to different island groups; the subspecies V. nigricornis nigricornis is the type for the genus Valanga.
Locusta migratoria migratorioides, commonly known as the African migratory locust, is a subspecies of the migratory locust family Acrididae.
Phymateus aegrotus, sometimes called the blue bush locust or East African bush locust, is a pest species of grasshopper in the family Pyrgomorphidae. Unlike "locusts" the adults are not known to change their morphology on crowding, but at the hopper stage, marching behaviour of small bands may occur.
Valanga is a genus of "bird grasshoppers" in the subfamily Cyrtacanthacridinae. Species are found from the Indian subcontinent through southeast Asia and the Korean peninsula to Australia and the Pacific islands.
Trimerotropis huroniana, known generally as the lake Huron locust or great lakes grasshopper, is a species of band-winged grasshopper in the family Acrididae. It is found in Wisconsin and Michigan in the United States, and Ontario in Canada.
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