Drain flies, sink flies, moth flies, or sewer gnats (Psychodidae) are small true flies (Diptera) with short, hairy bodies and wings giving them a "furry" moth-like appearance, hence one of their common names, moth flies. There are more than 4,700 known species worldwide, most of them native to the humid tropics. Moth flies sometimes inhabit human drains and sewage systems where they are a harmless but persistent annoyance.
The larvae of the subfamilies Psychodinae, Sycoracinae and Horaiellinae live in aquatic to semi-terrestrial or sludge-based habitats, including bathroom sinks, where they feed on bacteria and can become problematic. The larvae of the most commonly encountered species are nearly transparent with a non-retractable black head and can sometimes be seen moving along the moist edges of crevices in shower stalls or bathtubs or submerged in toilet water. The larval form of the moth flies is usually between 4 mm and 5 mm long, and is shaped like a long, thin, somewhat flattened cylinder. The body lacks prolegs, but the body segments are divided into a series of rings called annuli (singluar annulus). Some of these rings will have characteristic plates on the dorsal side. The larval thorax is not significantly larger than its abdomen, giving it a more "worm-like" appearance than that of most aquatic insect larvae. In some species, the larvae are able to secure themselves to surfaces of their environment using "attachment disks" on their ventral side. Like mosquito larvae, they are unable to absorb oxygen through water and instead breathe via a small dark tube (a spiracle) located on their posterior end— they must regularly reach the surface to obtain oxygen. The larval stage lasts for between 9 and 15 days, depending on species and on temperature/ environment. There are four instars.
In small numbers, the larvae are sometimes considered beneficial as their strong jaws are capable of cutting through the hair and sludge waste in drains which might otherwise form clogs. However, unless this sludge layer is removed entirely, the adult flies will continue to find it and lay more eggs.
While the biting midges also have larvae that have no prolegs and which also have attachment disks, the larvae of the netwinged midges can be distinguished from those of the moth fly by the multiple deep lateral constrictions of the latter.
The pupal stage lasts only for between 20 and 40 hours. During this stage, the insect will not feed but will remain submerged near the water surface, still breathing through a spiracle and soon metamorphosing into an adult fly which will burst through a seam in the pupal casing and emerge onto the water's surface.
The adults are only half the length of the larvae, but are much broader in appearance, with a pair of hairy wings held pitched-roof-like over the body. The wings have the most elementary venation of any of the Diptera, having little more than a series of parallel veins without crossveins. The adults are typically nocturnal, though they orient themselves around lights and may appear to be attracted to light. They are not known to carry any human diseases, and are not parasitic on any other animal.
The adults live for about 20 days, during which they will breed only once, often within hours of emerging from their pupal casings. Females will lay their eggs (between 30 and 100) just above the water line inside moist drains. Within 48 hours these eggs hatch into drain worms.
The subfamily Phlebotominae includes many blood-feeding species; they are inhabitants of more arid regions and are often called sand flies outside the United States where sand flies are distantly related Nematocera of the Ceratopogonidae. This subfamily is sometimes treated as a separate family Phlebotomidae; the type genus is Phlebotomus. Phlebotominae are a very important group medically, transmitting various tropical diseases, but most importantly kala azar leishmaniasis. Phlebotomus species are also vectors for bartonellosis, verruga peruana, pappataci fever, an arbovirus caused by sandfly fever viruses such as Naples and Sicilian strains, which are members of the genus Phlebovirus (family Bunyaviridae), which also includes the closely related Toscana virus.
In the Americas, the genus is implicated in the transmission of leishmaniasis is Lutzomyia. L. chagasi is responsible for the visceral form, while others like L. gomezi and L. longipalpis may be responsible for transmitting the cutaneous and mucocutaneous forms of this tropical disease.
Because of the extremely fine water-repellent hairs covering their bodies, adult drain flies are difficult to drown, and are not affected by contact with most water-borne toxins such as bleach. Boiling water has little or no effect on the adults for the same reason, and even the eggs are highly resistant to both chemical or thermal assault. Eggs can also withstand periods of dehydration. Extermination of this household pest depends on the maintenance of clean household drains for a period of at least three weeks.
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