Mosquito
Mosquito Temporal range: Late Cretaceous (Cenomanian) – Recent
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Aedes aegypti, vector of yellow fever | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Diptera |
Superfamily: | Culicoidea |
Family: | Culicidae Meigen, 1818[1] |
Subfamilies | |
Diversity | |
112 genera |
Mosquitoes, the Culicidae, are a
The mosquito life cycle consists of four stages:
The mosquito's
Description and life cycle

Like all flies, mosquitoes go through four stages in their life cycles:
Adult
Mosquitoes have one pair of wings, with distinct scales on the surface. Their wings are long and narrow, while the legs are long and thin. The body, usually grey or black, is slender, and typically 3–6 mm long. When at rest, mosquitoes hold their first pair of legs outwards, whereas the somewhat similar
Mosquitoes can develop from egg to adult in hot weather in as few as five days, but it may take up to a month.
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Anatomy of an adult female mosquito
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Adult yellow fever mosquito Aedes aegypti, typical of subfamily Culicinae. Male (left) has bushy antennae and longer palps than female (right)
Eggs
The eggs of most mosquitoes are laid in stagnant water, which may be a pond, a marsh, a temporary puddle, a water-filled hole in a tree, or the water-trapping leaf axils of a bromeliad. Some lay near the water's edge while others attach their eggs to aquatic plants. A few, like Opifex fuscus, can breed in salt-marshes.[5] Wyeomyia smithii breeds in the pitchers of pitcher plants, its larvae feeding on decaying insects that have drowned there.[18]
Clutches of eggs of most mosquito species hatch simultaneously, but Aedes eggs in diapause hatch irregularly over an extended period.[19]
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Anopheles eggs with side floats
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Electron micrograph of a culicine egg
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Culex egg raft
Larva
The mosquito larva's head has prominent mouth brushes used for feeding, a large
Pupa
The head and thorax of the pupa are merged into a cephalothorax, with the abdomen curving around beneath it. The pupa or "tumbler" can swim actively by flipping its abdomen. Like the larva, the pupa of most species must come to the surface frequently to breathe, which they do through a pair of respiratory trumpets on their cephalothoraxes. They do not feed; they pass much of their time hanging from the surface of the water by their respiratory trumpets. If alarmed, they swim downwards by flipping their abdomens in much the same way as the larvae. If undisturbed, they soon float up again. The adult emerges from the pupa at the surface of the water and flies off.[13]
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Mosquito pupae, shortly before the adults emerged. The head and thorax are fused into the cephalothorax.
Feeding by adults
Diet

Both male and female mosquitoes feed on
Host animals
Blood-sucking mosquitoes favour particular host species, though they are less selective when food is short. Different mosquito species favor
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Feeding on a snake
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Feeding on a frog
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Feeding on a bird
Finding hosts
Most mosquito species are
The multitude of characteristics in a host observed by the mosquito allows it to select a host to feed on. This occurs when a mosquito notes the presence of CO2, as it then activates odour and visual search behaviours that it otherwise would not use. In terms of a mosquito’s olfactory system, chemical analysis has revealed that people who are highly attractive to mosquitoes produce significantly more carboxylic acids.[41] A human's unique body odour indicates that the target is actually a human host rather than some other living warm-blooded animal (as the presence of CO2 shows). Body odour, composed of volatile organic compounds emitted from the skin of humans, is the most important cue used by mosquitoes.[42] Variation in skin odour is caused by body weight, hormones, genetic factors, and metabolic or genetic disorders. Infections such as malaria can influence an individual’s body odour. People infected by malaria produce relatively large amounts of Plasmodium-induced aldehydes in the skin, creating large cues for mosquitoes as it increases the attractiveness of an odour blend, imitating a "healthy" human odour. Infected individuals produce larger amounts of aldehydes heptanal, octanal, and nonanal. These compounds are detected by mosquito antennae. Thus, people infected with malaria are more prone to mosquito biting.[43]
Contributing to a mosquito's ability to activate search behaviours, a mosquito's visual search system includes sensitivity to wavelengths from different colours. Mosquitoes are attracted to longer wavelengths, correlated to the colours of red and orange as seen by humans, and range through the spectrum of human skin tones. In addition, they have a strong attraction to dark, high-contrast objects, because of how longer wavelengths are perceived against a lighter-coloured background.[44]

Different species of mosquitoes have evolved different methods of identifying target hosts. Study of a domestic form and an animal-biting form of the mosquito Aedes aegypti showed that the evolution of preference for human odour is linked to increases in the expression of the olfactory receptor AaegOr4. This recognises a compound present at high levels in human odour called sulcatone. However, the malaria mosquito Anopheles gambiae also has OR4 genes strongly activated by sulcatone, yet none of them are closely related to AaegOr4, suggesting that the two species have evolved to specialise in biting humans independently.[44]
Mouthparts
Female mosquito mouthparts are highly adapted to piercing skin and sucking blood. Males only drink sugary fluids, and have less specialized mouthparts.[45]
Externally, the most obvious feeding structure of the mosquito is the proboscis, composed of the
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Evolution of mosquito mouthparts, with grasshopper mouthparts (shown both in situ and separately) representing a more primitive condition. All the mouthparts except the labium are stylets, formed into a fascicle or bundle.
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Mouthparts of a female mosquito while feeding on blood, showing the flexiblelabiumsheath supporting the piercing and sucking tube which penetrates the host's skin
Saliva
Mosquito saliva contains
For a mosquito to obtain a blood meal, it must circumvent its
Egg development and blood digestion

Females of many blood-feeding species need a blood meal to begin the process of egg development. A sufficiently large blood meal triggers a hormonal cascade that leads to egg development.[62] Upon completion of feeding, the mosquito withdraws her proboscis, and as the gut fills up, the stomach lining secretes a peritrophic membrane that surrounds the blood. This keeps the blood separate from anything else in the stomach. Like many Hemiptera that survive on dilute liquid diets, many adult mosquitoes excrete surplus liquid even when feeding. This permits females to accumulate a full meal of nutrient solids. The blood meal is digested over a period of several days.[63] Once blood is in the stomach, the midgut synthesizes protease enzymes, primarily trypsin assisted by aminopeptidase, that hydrolyze the blood proteins into free amino acids. These are used in the synthesis of vitellogenin, which in turn is made into egg yolk protein.[64]
Distribution
Cosmopolitan
Mosquitoes have a
Eggs of
Effect of climate change
For a mosquito to transmit disease, there must be favorable seasonal conditions,
Ecology
Predators and parasites
Mosquito larvae are among the commonest animals in ponds, and they form an important food source for freshwater
Emerging adults are consumed at the pond surface by predatory flies including Empididae and Dolichopodidae, and by spiders. Flying adults are captured by dragonflies and damselflies, by birds such as swifts and swallows, and by vertebrates including bats.[80]
Mosquitoes are parasitised by hydrachnid mites, ciliates such as Glaucoma, microsporidians such as Thelania, and fungi including species of Saprolegniaceae and Entomophthoraceae.[80]
Pollination
Several flowers including members of the
Parasitism
Ecologically, blood-feeding mosquitoes are
Evolution
Fossil record

A 2023 study suggested that
Taxonomy
Over 3,600 species of mosquitoes in 112
The name Culicidae was introduced by the German entomologist
Phylogeny
External
Mosquitoes are members of a family of the true flies (order Diptera): the Culicidae (from the Latin culex, genitive culicis, meaning "midge" or "gnat").[95] They are members of the infraorder Culicomorpha and superfamily Culicoidea. The phylogenetic tree is based on the FLYTREE project.[96][97]
Diptera
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(true flies) |
Internal
The two subfamilies of mosquitoes are
Interactions with humans

Vectors of disease
Mosquitoes are
Control

Many measures have been tried for
Repellents

Insect repellents are applied on skin and give short-term protection against mosquito bites. The chemical
Bites
Mosquito bites lead to a variety of skin reactions and more seriously to
In human culture
Greek mythology
Origin myths
The peoples of
Lafcadio Hearn tells that in Japan, mosquitoes are seen as reincarnations of the dead, condemned by the errors of their former lives to the condition of Jiki-ketsu-gaki, or "blood-drinking pretas".[132]
Modern era
Winsor McCay's 1912 film How a Mosquito Operates was one of the earliest works of animation. It has been described as far ahead of its time in technical quality.[133] It depicts a giant mosquito tormenting a sleeping man.[134]
Twelve ships of the Royal Navy have borne the name HMS Mosquito or the archaic form of the name, HMS Musquito.[135]
The de Havilland Mosquito was a high-speed aircraft manufactured between 1940 and 1950, and used in many roles.[136]
The Russian city of Berezniki annually celebrates its mosquitoes from the 17th of July to the 20th in a "most delicious girl" competition. In the competition, the girls stand for 20 minutes in their shorts and vests, and the one who receives the most bites wins.[137]
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Further reading
- Winegard, Timothy Charles (2019). The mosquito: a human history of our deadliest predator. Penguin Random House. OCLC 1111638283.
External links
Quotations related to Mosquitoes at Wikiquote
- Mosquito at IFAS
- A film clip describing The Life Cycle of the Mosquito is available for viewing at the Internet Archive
- Parasitic Insects, Mites and Ticks: Genera of Medical and Veterinary Importance Wikibooks