Chelisoches morio | |
---|---|
A black earwig (Chelisoches morio) on a sign in Hawaii Botanical Garden | |
Scientific classification | |
Kingdom: | |
Phylum: | |
Class: | |
Order: | |
Family: | |
Genus: | |
Species: | C. morio |
Binomial name | |
Chelisoches morio | |
Synonyms [2] | |
Forficula morioFabricius, 1775 |
Chelisoches morio, also known as the black earwig, are part of the family Chelisochidae. It is an omnivore that can be found worldwide, however it is most prominent in tropical areas, Pacific islands, the Pacific Northwest, [3] and damp environments. The adults are jet black and can range in size from 18 to 25mm in size, though some have grown to be 36mm. The males cerci are widely separated and serrated compared to the female. The forceps are used for prey capture, defense, fighting and courtship. [4]
C. morio are most active at night, though normal behavior also occurs during the day. In addition to consuming prey such as aphids, leaf beetles, hoppers, mites, mealybugs and termites, C. morio also consume fruits such as bananas and dragon fruits.
C. morio have four instar stages before molting into adults. Females average about 140 eggs within one batch. [5] The incubation period lasts about 5–7 days. Adult males live for about 60 days and adult females live for about 94 days. Once the eggs hatch into the first instar, the nymphs congregate by the mother. The female then takes one day to feed the newly hatched nymphs. Afterwards, the nymphs molt into their second instar, growing and becoming independent of the female. The third and fourth instars show an increase in activity and predatory behavior, with the fourth instar being capable of killing adult prey. [6]
Female C. morio lay eggs in clusters, known as egg masses. The eggs are laid via an ovipositor in an irregularly shaped nest. The nests are about body length in size and are lined with soil and coir particles. The female digs out and builds the nest in moist substrates. After the eggs are laid, the females remains beside the egg cluster and protects, whisks, rearranges and maintains moisture of the eggs with her mouthparts until they hatch. [4] By guarding the cluster, the female ensures the viability of the eggs. If the female is separated from the eggs immediately after laying, they become void and will not hatch. [6]
Once the eggs hatch into the first instar, the nymphs aggregate next to their mother. For the next day, the mother feeds the nymphs and tends to them with her mouthparts. Before molting into their second instar, the nymphs stop feeding. The mother continues to protect them throughout the molting process (10–20 minutes). After the nymphs have finished molting to the second instar, they disperse and maternal care is concluded. [6]
Courtship is initiated by the male. He begins by tapping his antennae back and forth until he reaches the female. A receptive female then begins tapping her antennae back and forth before touching the male's antennae. [6] If the female is not receptive, the male will pursue until the female is receptive, or the female will use her own cerci to repel the male.
The touching of a female's antennae to the male's is the receptive signal that cues the male to move to the side of the female and curve his abdomen. In this position, the male pushes his cerci beneath the subgenital plate of the female, and their genitalia come into contact. A pair of C. morio can mate 2-8 times and copulation can last from minutes to an hour. Additionally, a male can mate with up to 6 females, each of which will produce fertilized eggs.
Mating occurs several times throughout an adults lifetime, and can occur at any time of day. Multiple matings is beneficial to the female as it leads to higher brood counts and increases the proportion of viable eggs. [6]
C. morio is a polyphagous group, meaning it has a wide range of prey. This feature makes C. morio a promising candidate for biological control, as it hunts and kills many agricultural pests. C. morio has shown a huge amount of predation on pests during all larval stages. [7] These pests include Tirathaba rufivena, Pseudococcidae, Aphididae, Chrysomelidae and many others. [5] The high prey consumption rates have made C. morio a focus of many different studies, ranging from the volume of pest intake, [5] to their life cycle, [6] and even testing different rearing techniques [4] to most effectively protect agricultural land.
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 forcep-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.
Forficula auricularia, the common earwig or European earwig, is an omnivorous insect in the family Forficulidae. The European earwig survives in a variety of environments and is a common household insect in North America. The name earwig comes from the appearance of the hindwings, which are unique and distinctive among insects, and resemble a human ear when unfolded; the species name of the common earwig, auricularia, is a specific reference to this feature. They are considered a household pest because of their tendency to invade crevices in homes and consume pantry foods, and may act either as a pest or as a beneficial species depending on the circumstances.
Dryocampa rubicunda, the rosy maple moth, is a small North American moth in the family Saturniidae, also known as the great silk moths. It was first described by Johan Christian Fabricius in 1793. The species is known for its wooly body and pink and yellow coloration, which varies from cream or white to bright pink or yellow. Males have bushier antennae than females, which allow them to sense female pheromones for mating.
Spodoptera litura, otherwise known as the tobacco cutworm or cotton leafworm, is a nocturnal moth in the family Noctuidae. S. litura is a serious polyphagous pest in Asia, Oceania, and the Indian subcontinent that was first described by Johan Christian Fabricius in 1775. Its common names reference two of the most frequent host plants of the moth. In total, 87 species of host plants that are infested by S. litura are of economic importance. The species parasitize the plants through the larvae vigorous eating patterns, oftentimes leaving the leaves completely destroyed. The moth's effects are quite disastrous, destroying economically important agricultural crops and decreasing yield in some plants completely. Their potential impact on the many different cultivated crops, and subsequently the local agricultural economy, has led to serious efforts to control the pests.
Labidura riparia is a species of earwig in the family Labiduridae characterized by their modified cerci as forceps, and light tan color. They are commonly known as the shore earwig, tawny earwig, riparian earwig, or the striped earwig due to two dark longitudinal stripes down the length of the pronotum. They are sometimes wrongly referred to as Labidura japonica, although said species is actually a subspecies, Labidura riparia japonica, found only in Japan. L. riparia are a cosmopolitan species primarily in tropical to subtropical regions. Body size varies greatly, ranging from 16 mm to 30 mm, with 10 abdominal segments. Males and females differ in forcep size, with males having much larger and stronger curve, while females have smaller, straighter forceps with a slight curve at the end. Earwigs use these forceps to assist in predation, defense, sexual selection, courting and mating, and wing folding.
Arixenia esau is a species of earwig in the genus Arixenia. It is in the family Arixeniidae, a group composed solely of ectoparasitic earwigs. Like most other species in Arixeniidae, A. esau is found in the tropics of Indonesia and Malaysia and has only been collected on the island of Borneo. The species is heavily associated with its host the hairless bat and is most commonly collected from the fur of these bats and from caves inhabited by them. Arixenia esau is a rare species and has only been observed infrequently in its natural habitat.
The ringlegged earwig is a species of earwig in the family Anisolabididae.
Euborellia plebeja is a species of earwig in the family Anisolabididae. Like other members of the Anisolabididae family, this species has an elongated virga, a sclerotized tube that is part of the male genitalia.
Schizodactylus monstrosus or the maize cricket, is a species of large, robust cricket found in Asia, belonging to the family Schizodactylidae. It is found mainly in sandy habitats along rivers, and has large flattened tarsal extensions and wings that are curled at the tip, right above the cerci. They are nocturnal and show a high degree of variation in activity during the day and night. They hide in burrows that they dig on their own during the day.
Chloroperlidae are a family of stoneflies, commonly known as green stoneflies, with more than 200 species and 22 genera. They appear green to yellow in colour, and are popularly used among fisherman as bait for trout fishing. Green stoneflies live in the benthic zone of the cold streams and rivers of five continents and four zoogeographical regions, emerging from the water to live in the riparian zone as adults. They are sensitive to pollutants, making them an indicator species for determining the quality of water bodies. Chloroperlidae are hemimetabolous, having no pupal stage, but instead hatch from eggs as nymphs and mature directly into adults. They are omnivorous, feeding on small organisms and plant particles, and become more carnivorous as they mature. The classification of Chloroperlidae is contested, with some believing that they should be considered as members of different orders, as opposed to the order Plecoptera that they currently belong to.
Hapljapyx is a genus of diplurans in the family Japygidae.
Zelus renardii, commonly known as the leaf hopper assassin bug, is a predacious insect contained within tribe Harpactorini. Diurnal and found on both wild and crop plants, Z. renardii has spread from its native habitats in western North and Central America into three other biogeographic regions across the globe.
Trichopoda pennipes is a species of feather-legged fly in the dipteran family Tachinidae.
Poecilocapsus lineatus, commonly known as the fourlined plant bug, is a species of true bug (Hemiptera) in the family Miridae. This species is native to the United States and Canada.
Toxolabis is an extinct genus of earwig in the dermapteran family Anisolabididae known from a Cretaceous fossil found in Burma. The genus contains a single described species, Toxolabis zigrasi.
Enchenopa binotata is a complex of multiple species found mostly in Eastern North America, but have also been reported in Central America. They are commonly referred to as treehoppers and are sap-feeding insects. The species in the complex look similar to each other in morphology, but are identified as different species by the host plant they occupy.
Dysdercus koenigii is a species of true bug in the family Pyrrhocoridae, commonly known as the red cotton stainer. It is a serious pest of cotton crops, the adults and older nymphs feeding on the emerging bolls and the cotton seeds as they mature, transmitting cotton staining fungi as they do so.
Euthyrhynchus floridanus, the Florida predatory stink bug, is a species of carnivorous shield bug in the family Pentatomidae, the only species in the genus Euthyrhynchus. It is native to the hottest parts of the southeastern United States and is considered beneficial because it feeds on many species of pest insects. They also feed on things such as grasshoppers and other small insects. This species also hunts in a pack, with up to twelve.
Aspidiotus destructor, the coconut scale, is a species of armoured scale insect in the family Diaspididae, found in many tropical and subtropical parts of the world. It is a serious pest of coconut and banana, and attacks a range of other fruiting trees and ornamental plants.
Planococcus ficus, commonly known as the vine mealybug, is a species of mealybug, belonging to the family Pseudococcidae, native to tropical and subtropical regions. The vine mealybug is found in Europe, Northern Africa, Southern Africa, the Americas, and the Middle East. The vine mealybug is invasive to weedy plants in many different regions of the world.