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65-551: Earwigs make up the insect order Dermaptera . With about 2,000 species in 12 families, they are one of the smaller insect orders. Earwigs have characteristic cerci , a pair of forceps -like pincers on their abdomen, and membranous wings folded underneath short, rarely used forewings, hence the scientific order name, "skin wings". Some groups are tiny parasites on mammals and lack the typical pincers. Earwigs are found on all continents except Antarctica . Earwigs are mostly nocturnal and often hide in small, moist crevices during

130-452: A chitinous exoskeleton , a three-part body ( head , thorax and abdomen ), three pairs of jointed legs , compound eyes , and a pair of antennae . Insects are the most diverse group of animals, with more than a million described species ; they represent more than half of all animal species. The insect nervous system consists of a brain and a ventral nerve cord . Most insects reproduce by laying eggs . Insects breathe air through

195-411: A primate with traits that would represent anything in between humans and the other great apes . If the concept of an ape-man were based on neontology, then our phenotype would resemble Bigfoot . Since the concept was based on paleontology, the idea of an ape-man could possibly be represented by the fossil hominids. Neontology studies extant (living) taxa and recently extinct taxa, but declaring

260-477: A biological control of earwigs for almost a century. Another tachinid fly and parasite of earwigs, Ocytata pallipes , has shown promise as a biological control agent as well. The common predatory wasp, the yellow jacket ( Vespula maculifrons ), preys upon earwigs when abundant. A small species of roundworm, Mermis nigrescens , is known to occasionally parasitize earwigs that have consumed roundworm eggs with plant matter. At least 26 species of parasitic fungus from

325-585: A brain, a subesophageal ganglion , three thoracic ganglia, and six abdominal ganglia. Strong neuron connections connect the neurohemal corpora cardiaca to the brain and frontal ganglion, where the closely related median corpus allatum produces juvenile hormone III in close proximity to the neurohemal dorsal arota. The digestive system of earwigs is like all other insects, consisting of a fore-, mid-, and hindgut, but earwigs lack gastric caecae which are specialized for digestion in many species of insect. Long, slender (excretory) malpighian tubules can be found between

390-590: A district. In August 1755 they appeared in vast numbers near Stroud, Gloucestershire, UK, especially in the cracks and crevices of "old wooden buildings...so that they dropped out oftentimes in such multitudes as to literally cover the floor." A similar "plague" occurred in 2006, in and around a woodland cabin near the Blue Ridge Mountains of the eastern United States; it persisted through winter and lasted at least two years. Earwigs are mostly scavengers, but some are omnivorous or predatory. The abdomen of

455-563: A hundred species, are marine. Insects such as snow scorpionflies flourish in cold habitats including the Arctic and at high altitude. Insects such as desert locusts , ants, beetles, and termites are adapted to some of the hottest and driest environments on earth, such as the Sonoran Desert . Insects form a clade , a natural group with a common ancestor, among the arthropods . A phylogenetic analysis by Kjer et al. (2016) places

520-584: A large extent, this species is also a scavenger, feeding on decaying plant and animal matter if given the chance. Observed prey include largely plant lice, but also large insects such as bluebottle flies and woolly aphids . Plants that they feed on typically include clover , dahlias , zinnias , butterfly bush , hollyhock , lettuce , cauliflower , strawberry , blackberry , sunflowers , celery , peaches , plums , grapes , potatoes , roses , seedling beans and beets , and tender grass shoots and roots; they have also been known to eat corn silk , damaging

585-545: A pupa, developing through a series of increasingly adult-like nymphal stages. The higher level relationship of the insects is unclear. Fossilized insects of enormous size have been found from the Paleozoic Era, including giant dragonfly-like insects with wingspans of 55 to 70 cm (22 to 28 in). The most diverse insect groups appear to have coevolved with flowering plants . Adult insects typically move about by walking and flying; some can swim. Insects are

650-528: A single genital opening, so only one of the paired penises is ever used during copulation. The forewings are short oblong leathery plates used to cover the hindwings like the elytra of a beetle, rather than to fly. Most species have short and leather-like forewings with very thin hindwings, though species in the former suborders Arixeniina and Hemimerina (epizoic species, sometimes considered as ectoparasites) are wingless and blind with filiform segmented cerci (today these are both included merely as families in

715-418: A system of paired openings along their sides, connected to small tubes that take air directly to the tissues. The blood therefore does not carry oxygen; it is only partly contained in vessels, and some circulates in an open hemocoel . Insect vision is mainly through their compound eyes , with additional small ocelli . Many insects can hear, using tympanal organs , which may be on the legs or other parts of

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780-536: A taxon to be definitively extinct is difficult. Taxa that have previously been declared extinct may reappear over time. Species that were once considered extinct and then reappear unscathed are characterized by the term "the Lazarus effect", or are also called a Lazarus species . For example, a study determined that 36% of supposed mammalian extinction had been proven, while the other 64% had insufficient evidence to be declared extinct or had been rediscovered. Currently,

845-501: A total of 11 species. Dermaptera is relatively small compared to the other orders of Insecta , with only about 2,000 species, 3 suborders and 15 families, including the extinct suborders Archidermaptera and Eodermaptera with their extinct families Protodiplatyidae , Dermapteridae, Semenoviolidae , and Turanodermatidae . The phylogeny of the Dermaptera is still debated. The extant Dermaptera appear to be monophyletic and there

910-525: A variety of ways. Male moths can sense the pheromones of female moths over great distances. Other species communicate with sounds: crickets stridulate , or rub their wings together, to attract a mate and repel other males. Lampyrid beetles communicate with light. Humans regard many insects as pests , especially those that damage crops, and attempt to control them using insecticides and other techniques. Others are parasitic , and may act as vectors of diseases . Insect pollinators are essential to

975-482: A wide array of living and dead plant and animal matter. For protection from predators, the species Doru taeniatum of earwigs can squirt foul-smelling yellow liquid in the form of jets from scent glands on the dorsal side of the third and fourth abdominal segment. It aims the discharges by revolving the abdomen, a maneuver that enables it simultaneously to use its pincers in defense. Under exceptional circumstances, earwigs form swarms and can take over significant areas of

1040-399: Is broadly agreed or certified that no members of the group are still alive. Conversely, an extinct taxon can be reclassified as extant if there are new discoveries of living species (" Lazarus species "), or if previously known extant species are reclassified as members of the taxon. Most biologists, zoologists , and botanists are in practice neontologists, and the term neontologist

1105-494: Is derived from the Old English ēare , which means ' ear ' , and wicga , which means ' insect ' , or literally, ' beetle ' . Entomologists suggest that the origin of the name is a reference to the appearance of the hindwings, which are unique and distinctive among insects, and resemble a human ear when unfolded. The name is more popularly thought to be related to the old wives' tale that earwigs burrowed into

1170-447: Is no fossil record, but they are probably no older than late Tertiary . Some evidence of early evolutionary history is the structure of the antennal heart, a separate circulatory organ consisting of two ampullae , or vesicles, that are attached to the frontal cuticle near the bases of the antennae . These features have not been found in other insects. An independent organ exists for each antenna, consisting of an ampulla , attached to

1235-525: Is support for the monophyly of the families Forficulidae, Chelisochidae, Labiduridae and Anisolabididae, however evidence has supported the conclusion that the former suborder Forficulina was paraphyletic through the exclusion of Hemimerina and Arixeniina which should instead be nested within the Forficulina. Thus, these former suborders were eliminated in the most recent higher classification. Earwigs are fairly abundant and are found in many areas around

1300-567: Is the Australian giant earwig ( Titanolabis colossea ) which is approximately 50 mm (2 in) long, while the possibly extinct (declared extinct in 2014) Saint Helena earwig ( Labidura herculeana ) reached 78 mm ( 3 + 1 ⁄ 16  in). Earwigs are characterized by the cerci , or the pair of forceps -like pincers on their abdomen; male earwigs generally have more curved pincers than females. These pincers are used to capture prey, defend themselves and fold their wings under

1365-443: Is used largely by paleontologists referring to non- paleontologists . Stephen Jay Gould said of neontology: All professions maintain their parochialisms , and I trust that nonpaleontological readers will forgive our major manifestation . We are paleontologists, so we need a name to contrast ourselves with all you folks who study modern organisms in human or ecological time . You therefore become neontologists. We do recognize

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1430-570: The International Union for Conservation of Nature considers a taxon to be recently extinct if the extinction occurred after 1500 C.E. A recently considered extinct mammal was the Bouvier's red colobus monkey, who was considered extinct up until 2015 when it was rediscovered after 40 years with no recorded sightings. Neontology's fundamental theories rely on biological models of natural selection and speciation that connect genes,

1495-853: The Latin word insectum from in , "cut up", as insects appear to be cut into three parts. The Latin word was introduced by Pliny the Elder who calqued the Ancient Greek word ἔντομον éntomon "insect" (as in entomology ) from ἔντομος éntomos "cut in pieces"; this was Aristotle 's term for this class of life in his biology , also in reference to their notched bodies. The English word insect first appears in 1601 in Philemon Holland 's translation of Pliny. In common speech, insects and other terrestrial arthropods are often called bugs . Entomologists to some extent reserve

1560-2248: The Paraneoptera , and Kjer et al. 2016 for the Holometabola . The numbers of described extant species (boldface for groups with over 100,000 species) are from Stork 2018. Archaeognatha (hump-backed/jumping bristletails, 513 spp) [REDACTED] Zygentoma (silverfish, firebrats, fishmoths, 560 spp) [REDACTED] Odonata (dragonflies and damselflies, 5,899 spp) [REDACTED] Ephemeroptera (mayflies, 3,240 spp) [REDACTED] Zoraptera (angel insects, 37 spp) [REDACTED] Dermaptera (earwigs, 1,978 spp) [REDACTED] Plecoptera (stoneflies, 3,743 spp) [REDACTED] Orthoptera (grasshoppers, crickets, katydids, 23,855 spp) [REDACTED] Grylloblattodea (ice crawlers, 34 spp) [REDACTED] Mantophasmatodea (gladiators, 15 spp) [REDACTED] Phasmatodea (stick insects, 3,014 spp) [REDACTED] Embioptera (webspinners, 463 spp) [REDACTED] Mantodea (mantises, 2,400 spp) [REDACTED] Blattodea (cockroaches and termites, 7,314 spp) [REDACTED] Psocodea (book lice, barklice and sucking lice, 11,000 spp) [REDACTED] [REDACTED] Hemiptera (true bugs, 103,590 spp) [REDACTED] Thysanoptera (thrips, 5,864 spp) [REDACTED] Hymenoptera (sawflies, wasps, bees, ants, 116,861 spp) [REDACTED] Strepsiptera (twisted-wing flies, 609 spp) [REDACTED] Coleoptera (beetles, 386,500 spp) [REDACTED] Raphidioptera (snakeflies, 254 spp) [REDACTED] Neuroptera (lacewings, 5,868 spp) [REDACTED] Megaloptera (alderflies and dobsonflies, 354 spp) [REDACTED] Lepidoptera (butterflies and moths, 157,338 spp) [REDACTED] Trichoptera (caddisflies, 14,391 spp) [REDACTED] Diptera (true flies, 155,477 spp) [REDACTED] Mecoptera (scorpionflies, 757 spp) [REDACTED] Siphonaptera (fleas, 2,075 spp) [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] Extant taxon A taxon can be classified as extinct if it

1625-604: The Dermaptera starts in the Late Triassic to Early Jurassic period about 208  million years ago in England and Australia, and comprises about 70 specimens in the extinct suborder Archidermaptera . Some of the traits believed by neontologists to belong to modern earwigs are not found in the earliest fossils, but adults had five-segmented tarsi (the final segment of the leg), well developed ovipositors , veined tegmina (forewings) and long segmented cerci ; in fact

1690-623: The Hemiptera (true bugs), Lepidoptera (butterflies and moths), Diptera (true flies), Hymenoptera (wasps, ants, and bees), and Coleoptera (beetles), each with more than 100,000 described species. Insects are distributed over every continent and almost every terrestrial habitat. There are many more species in the tropics , especially in rainforests , than in temperate zones. The world's regions have received widely differing amounts of attention from entomologists. The British Isles have been thoroughly surveyed, so that Gullan and Cranston 2014 state that

1755-1202: The United States. The only native species of earwig found in the north of the United States is the spine-tailed earwig ( Doru aculeatum ), found as far north as Canada, where it hides in the leaf axils of emerging plants in southern Ontario wetlands . However, other families can be found in North America, including Forficulidae ( Doru and Forficula being found there), Spongiphoridae , Anisolabididae , and Labiduridae . Few earwigs survive winter outdoors in cold climates. They can be found in tight crevices in woodland, fields and gardens. Out of about 1,800 species, about 25 occur in North America, 45 in Europe (including 7 in Great Britain), and 60 in Australia. Most earwigs are flattened (which allows them to fit inside tight crevices, such as under bark) with an elongated body generally 7–50 millimetres ( 1 ⁄ 4 –2 in) long. The largest extant species

1820-460: The autumn, and can be found together in the autumn and winter. The male and female will live in a chamber in debris, crevices, or soil 2.5 centimetres (1 in) deep. After mating, the sperm may remain in the female for months before the eggs are fertilized. From midwinter to early spring, the male will leave, or be driven out by the female. Afterward the female will begin to lay 20 to 80 pearly white eggs in two days. Some earwigs, those parasitic in

1885-459: The body. Their sense of smell is via receptors, usually on the antennae and the mouthparts. Nearly all insects hatch from eggs . Insect growth is constrained by the inelastic exoskeleton, so development involves a series of molts . The immature stages often differ from the adults in structure, habit and habitat. Groups that undergo four-stage metamorphosis often have a nearly immobile pupa . Insects that undergo three-stage metamorphosis lack

1950-487: The brains of humans through the ear and laid their eggs there. Earwigs are not known to purposefully climb into ear canals, but there has been at least one anecdotal report of earwigs being found in the ear. Earwigs are abundant and can be found throughout the Americas and Eurasia . The common earwig was introduced into North America in 1907 from Europe, but tends to be more common in the southern and southwestern parts of

2015-623: The common European Earwig. Species within Forficulina are free-living, have functional wings and are not parasites. The cerci are unsegmented and modified into large, forceps-like structures. The first epizoic species of earwig was discovered by a London taxidermist on the body of a Malaysian hairless bulldog bat in 1909, then described by Karl Jordan . By the 1950s, the two suborders Arixeniina and Hemimerina had been added to Dermaptera. These were subsequently demoted to family Arixeniidae and superfamily Hemimeroidea (with sole family Hemimeridae ), respectively. They are now grouped together with

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2080-479: The crop. Species of the suborders Arixeniina and Hemimerina are generally considered epizoic, or living on the outside of other animals , mainly mammals. In the Arixeniina , family Arixeniidae , species of the genus Arixenia are normally found deep in the skin folds and gular pouch of Malaysian hairless bulldog bats ( Cheiromeles torquatus ), apparently feeding on bats' body or glandular secretions. On

2145-480: The day, and are active at night, feeding on a wide variety of insects and plants. Damage to foliage, flowers, and various crops is commonly blamed on earwigs, especially the common earwig Forficula auricularia . Earwigs have five molts in the year before they become adults. Many earwig species display maternal care, which is uncommon among insects. Female earwigs may care for their eggs; the ones that do will continue to watch over nymphs until their second molt. As

2210-1043: The daytime. They can usually be seen on household walls and ceilings. Interaction with earwigs at this time results in a defensive free-fall to the ground followed by a scramble to a nearby cleft or crevice. During the summer they can be found around damp areas such as near sinks and in bathrooms. Earwigs tend to gather in shady cracks or openings or anywhere that they can remain concealed during daylight. Picnic tables, compost and waste bins, patios, lawn furniture, window frames, or anything with minute spaces (even artichoke blossoms) can potentially harbour them. Earwigs are regularly preyed upon by birds, and like many other insect species they are prey for insectivorous mammals, amphibians, lizards, centipedes, assassin bugs, and spiders. European naturalists have observed bats preying upon earwigs. Their primary insect predators are parasitic species of Tachinidae , or tachinid flies, whose larvae are endoparasites . One species of tachinid fly, Triarthria setipennis , has been demonstrated to be successful as

2275-445: The earliest diverging members of the group, alongside angel insects ( Zoraptera ), and stoneflies ( Plecoptera ), but the exact relationship among the three groups is uncertain. The scientific name for the order, Dermaptera , is Greek in origin, stemming from the words derma , meaning ' skin ' , and pteron (plural ptera ), meaning ' wing ' . It was coined by Charles De Geer in 1773. The common term, earwig,

2340-426: The earwig is flexible and muscular. It is capable of maneuvering as well as opening and closing the forceps. The forceps are used for a variety of purposes. In some species, the forceps have been observed in use for holding prey , and in copulation . The forceps tend to be more curved in males than in females. The common earwig is an omnivore, eating plants and ripe fruit as well as actively hunting arthropods . To

2405-439: The eggs are replaced; however, when the eggs were continuously replaced after hatching, the mother continued to clean the new eggs for up to three months. Studies have also shown that the mother does not immediately recognize her own eggs. After laying them, she gathers them together, and studies have found mothers to pick up small egg-shaped wax balls or stones by accident. Eventually, the impostor eggs were rejected for not having

2470-452: The few non-social insect species that show maternal care. The mother pays close attention to the needs of her eggs, such as warmth and protection. She faithfully defends the eggs from predators, not leaving them even to eat unless the clutch goes bad. She also continuously cleans the eggs to protect them from fungi . Studies have found that the urge to clean the eggs persists for only a few days after they are removed, and does not return even if

2535-478: The foliage and the insects eating such foliage, such as aphids , though it would take a large population to do considerable damage. The common earwig eats a wide variety of plants, and also a wide variety of foliage, including the leaves and petals. They have been known to cause economic losses in fruit and vegetable crops. Some examples are the flowers, hops , red raspberries , and corn crops in Germany, and in

2600-448: The former Forficulina in the new suborder Neodermaptera . Arixeniidae represents two genera, Arixenia and Xeniaria , with a total of five species in them. As with Hemimeridae, they are blind and wingless, with filiform segmented cerci. Hemimeridae are viviparous ectoparasites , preferring the fur of African rodents in either Cricetomys or Beamys genera. Hemimerina also has two genera, Hemimerus and Araeomerus , with

2665-440: The frontal cuticle medial to the antenna base and forming a thin-walled sac with a valved ostium on its ventral side. They pump blood by elastic connective tissue, rather than muscle. The characteristics which distinguish the order Dermaptera from other insect orders are: The overwhelming majority of earwig species are in the former suborder Forficulina, grouped into nine families of 180 genera, including Forficula auricularia ,

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2730-608: The insects among the Hexapoda , six-legged animals with segmented bodies; their closest relatives are the Diplura (bristletails). Collembola (springtails) [REDACTED] Protura (coneheads) [REDACTED] Diplura (two-pronged bristletails) [REDACTED] Insecta (=Ectognatha) [REDACTED] The internal phylogeny is based on the works of Wipfler et al. 2019 for the Polyneoptera , Johnson et al. 2018 for

2795-467: The junction of the mid- and hind gut. The reproductive system of females consist of paired ovaries , lateral oviducts , spermatheca , and a genital chamber . The lateral ducts are where the eggs leave the body, while the spermatheca is where sperm is stored. Unlike other insects, the gonopore , or genital opening is behind the seventh abdominal segment. The ovaries are primitive in that they are polytrophic (the nurse cells and oocytes alternate along

2860-411: The length of the ovariole ). In some species these long ovarioles branch off the lateral duct, while in others, short ovarioles appear around the duct. Earwigs are hemimetabolous , meaning they undergo incomplete metamorphosis, developing through a series of four to six molts . The developmental stages between molts are called instars . Earwigs live for about a year from hatching. They start mating in

2925-474: The most frequently suggested order of insects to be the closest relatives of Dermaptera is Notoptera , theorized by Giles in 1963. However, other arguments have been made by other authors linking them to Phasmatodea , Embioptera , Plecoptera , and Dictyoptera . A 2012 mitochondrial DNA study suggested that this order is the sister to stoneflies of the order Plecoptera . A 2018 phylogenetic analysis found that their closest living relatives were angel insects of

2990-418: The mother dies before the nymphs are ready to leave, the nymphs may eat her. After five to six instars , the nymphs will molt into adults. The male's forceps will become curved, while the females' forceps remain straight. They will also develop their natural color, which can be anything from a light brown (as in the tawny earwig ) to a dark black (as in the ringlegged earwig ). In species of winged earwigs,

3055-402: The name "bugs" for a narrow category of " true bugs ", insects of the order Hemiptera , such as cicadas and shield bugs . Other terrestrial arthropods, such as centipedes , millipedes , woodlice , spiders , mites and scorpions , are sometimes confused with insects, since they have a jointed exoskeleton. Adult insects are the only arthropods that ever have wings, with up to two pairs on

3120-571: The nymphs molt, sexual dimorphism such as differences in pincer shapes begins to show. Extant Dermaptera belong to the suborder Neodermaptera , which first appeared during the Cretaceous . Some earwig specimen fossils are placed with extinct suborders Archidermaptera or Eodermaptera , the former dating to the Late Triassic and the latter to the Middle Jurassic. Dermaptera belongs to the major grouping Polyneoptera , and are amongst

3185-554: The only invertebrates that can achieve sustained powered flight; insect flight evolved just once. Many insects are at least partly aquatic , and have larvae with gills; in some species, the adults too are aquatic. Some species, such as water striders , can walk on the surface of water. Insects are mostly solitary, but some, such as bees , ants and termites , are social and live in large, well-organized colonies . Others, such as earwigs , provide maternal care, guarding their eggs and young. Insects can communicate with each other in

3250-655: The order Laboulbeniales have been found on earwigs. The eggs and nymphs are also cannibalized by other earwigs. A species of tyroglyphoid mite, Histiostoma polypori ( Histiostomatidae , Astigmata ), are observed on common earwigs, sometimes in great densities; however, this mite feeds on earwig cadavers and not its live earwig transportation. Hippolyte Lucas observed scarlet acarine mites on European earwigs. Phasmatodea Embioptera Orthoptera Notoptera † Dermapteridae † Protodiplatyidae † Bellodermatidae † Semenoviolidae † Turanodermatidae Hemimerina Arixeniina Forficulina The fossil record of

3315-690: The order Zoraptera , with very high support. Archidermaptera is believed to be sister to the remaining earwig groups, the extinct Eodermaptera and the living suborder Neodermaptera (= former suborders Forficulina, Hemimerina, and Arixeniina). The extinct suborders have tarsi with five segments (unlike the three found in Neodermaptera) as well as unsegmented cerci. No fossil Hemimeridae and Arixeniidae are known. Species in Hemimeridae were at one time in their own order, Diploglassata, Dermodermaptera, or Hemimerina . Like most other epizoic species, there

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3380-462: The other hand, species in the genus Xeniaria (still of the suborder Arixeniina) are believed to feed on the guano and possibly the guanophilous arthropods in the bat's roost, where it has been found. Hemimerina includes Araeomerus found in the nest of long-tailed pouch rats ( Beamys ), and Hemimerus which are found on giant Cricetomys rats. Earwigs are generally nocturnal , and typically hide in small, dark, and often moist areas in

3445-611: The pincers would not have been curled or used as they are now. The theorized stem group of the Dermaptera are the Protelytroptera , which are similar to modern Blattodea (cockroaches) with shell-like forewings and the large, unequal anal fan, are known from the Permian of North America, Europe and Australia. No fossils from the Triassic — during which Dermaptera would have evolved from Protelytroptera — have been found. Amongst

3510-503: The population structure than paleontology does. When the scientific community accepted the synthetic theory of evolution , taxonomies became phylogenetic . As a result, information gaps arose within the fossil record of species, especially in Homo sapiens . The anthropologists who accepted the synthetic theory reject the idea of an "ape-man" because the concept had mistaken paleontology with neontology. An ape-man, in actuality, would be

3575-424: The proper scent. The eggs hatch in about seven days. The mother may assist the nymphs in hatching. When the nymphs hatch, they eat the egg casing and continue to live with the mother. The nymphs look similar to their parents, only smaller, and will nest under their mother and she will continue to protect them until their second molt. The nymphs feed on food regurgitated by the mother, and on their own molts. If

3640-535: The reproduction of many flowering plants and so to their ecosystems. Many insects are ecologically beneficial as predators of pest insects, while a few provide direct economic benefit. Two species in particular are economically important and were domesticated many centuries ago: silkworms for silk and honey bees for honey . Insects are consumed as food in 80% of the world's nations, by people in roughly 3000 ethnic groups. Human activities are having serious effects on insect biodiversity . The word insect comes from

3705-690: The short tegmina . The antennae are thread-like with at least 10 segments. Males in the six families Karschiellidae, Pygidicranidae, Diplatyidae, Apachyidae, Anisolabisidae and Labiduridae have paired penises, while the males in the remaining groups have a single penis. Both penises are symmetrical in Pygidicranidae and Diplatyidae, but in Karschiellidae the left one is strongly reduced. Apachyidae, Anisolabisidae, and Labiduridae have an asymmetrical pair, with left and right one pointing on opposite directions when not in use. The females have just

3770-413: The south of France, earwigs have been observed feeding on peaches and apricots . The earwigs attacked mature plants and made cup-shaped bite marks 3–11 mm ( 1 ⁄ 8 – 7 ⁄ 16  in) in diameter. Insect Insects (from Latin insectum ) are hexapod invertebrates of the class Insecta . They are the largest group within the arthropod phylum . Insects have

3835-400: The suborder Neodermaptera). The hindwing is a very thin membrane that expands like a fan, radiating from one point folded under the forewing. Even though most earwigs have wings and are capable of flight, they are rarely seen in flight. These wings are unique in venation and in the pattern of folding that requires the use of the cerci. The neuroendocrine system is typical of insects. There is

3900-406: The suborders Arixeniina and Hemimerina , are viviparous (give birth to live young); they would be fed by a sort of placenta . When first laid, the eggs are white or cream-colored and oval-shaped, but right before hatching they become kidney-shaped and brown. Each egg is approximately 1 mm ( 1 ⁄ 32  in) tall and 0.8 mm ( 1 ⁄ 32  in) wide. Earwigs are among

3965-527: The thorax. Whether winged or not, adult insects can be distinguished by their three-part body plan, with head, thorax, and abdomen; they have three pairs of legs on the thorax. Estimates of the total number of insect species vary considerably, suggesting that there are perhaps some 5.5 million insect species in existence, of which about one million have been described and named. These constitute around half of all eukaryote species, including animals , plants , and fungi . The most diverse insect orders are

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4030-525: The total of around 22,500 species is probably within 5% of the actual number there; they comment that Canada's list of 30,000 described species is surely over half of the actual total. They add that the 3000 species of the American Arctic must be broadly accurate. In contrast, a large majority of the insect species of the tropics and the southern hemisphere are probably undescribed. Some 30–40,000 species inhabit freshwater ; very few insects, perhaps

4095-725: The unbalanced and parochial nature of this dichotomous division. Neontological evolutionary biology has a temporal perspective between 100 and 1000 years. Neontology's fundamental basis relies on models of natural selection as well as speciation . Neontology's methods, when compared to evolutionary paleontology , have a greater emphasis on experiments. There are more frequent discontinuities present in paleontology than in neontology, because paleontology involves extinct taxa. Neontology has organisms actually present and available to sample and perform research on. Neontology's research method uses cladistics to examine morphologies and genetics . Neontology data has more emphasis on genetic data and

4160-514: The wings will start to develop at this time. The forewings of an earwig are sclerotized to serve as protection for the membranous hindwings. Most earwigs are nocturnal and inhabit small crevices, living in small amounts of debris, in various forms such as bark and fallen logs. Species have been found to be blind and living in caves, or cavernicolous, reported to be found on the island of Hawaii and in South Africa. Food typically consists of

4225-461: The world. There is no evidence that they transmit diseases to humans or other animals. Their pincers are commonly believed to be dangerous, but in reality, even the curved pincers of males cause little or no harm to humans. Earwigs have been rarely known to crawl into the ears of humans, and they do not lay eggs inside the human body or human brain as is often claimed. There is a debate whether earwigs are harmful or beneficial to crops, as they eat both

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