Psychodidae

Some flies live in wet drains.

They look like tiny, furry moths. Their wings have many hairs.

These flies start as small worms.

The worms live in sink sludge. They eat tiny bits of waste. This helps clean the drain.

The worms must breathe air. They use a small tube to do this. They go to the surface to breathe.

Soon, the worms change into flies. The new flies are very small. They fly at night. They like bright lights.

Most of these flies live in warm lands. There are many kinds of these flies. They are very interesting to see.

Psychodidae is a big family of flies. Many people call them drain flies or moth flies. This is because their wings are hairy. They look a bit like tiny moths. There are more than 2,600 kinds of these flies. Most of them live in warm, wet places.

These flies have a busy life cycle. They start as larvae, which are small, worm-like creatures. These larvae live in wet sludge or sinks. They eat bacteria found in the waste. This can actually help clean drains by eating hair and sludge.

Larvae cannot breathe underwater. They use a small tube called a spiracle to breathe air. They must reach the surface to get oxygen. After 9 to 15 days, they become pupae. A pupa is a stage where the insect changes.

Soon, the adult fly bursts out. The adults are active at night. They like to fly near lights and smells. They live for about 20 days. During this time, females lay eggs in moist drains. The cycle starts all over again.

Psychodidae is a very large family of true flies. You might know them by other names like drain flies, sink flies, or moth flies. Some people call them sewer flies or sewer gnats. They get the name moth flies because their bodies and wings are short and hairy. This makes them look a bit like tiny moths. There are more than 2,600 different species in this family. Most of these living things live in warm, humid places around the world.

The life of a drain fly happens in several steps. It starts when a female lays between 30 and 100 eggs. She lays them just above the water line in moist drains. In about 48 hours, these eggs hatch into larvae. These larvae look like long, thin, worm-like cylinders. They are nearly transparent and have a black head. They live in wet sludge or bathroom sinks. They eat bacteria found in the waste.

These tiny larvae have a special way of breathing. They cannot take oxygen from the water. Instead, they use a small dark tube called a spiracle. This tube is located on their back end. The larvae must reach the water surface to breathe air. This stage lasts between 9 and 15 days. After that, they enter the pupal stage. This stage lasts from 20 to 40 hours. During this time, they stay near the surface and change into adults.

Scientists have studied these flies for a long time. We can find evidence of them in ancient history. Some species are preserved in amber from places like Myanmar. For example, Datzia bispina is found in Burmese amber. Other fossils come from the Eocene period in Baltic amber. We also find them in Lebanese amber from the Barremian age. These fossils show that these flies have been around for a very long time.

Adult flies behave in interesting ways. They are mostly nocturnal, which means they are active at night. They often fly near lights or strong smells. They are erratic fliers, so they move in a shaky way. They can also run very quickly on surfaces. Most adults live for about 20 days. They often breed only once in their short lives. While most are harmless, some types called Phlebotominae feed on blood. This can sometimes spread diseases to animals or people.

Psychodidae is a diverse family of true flies found throughout the world. They are known by many common names, including drain flies, sink flies, and sewer gnats. Some people call them moth flies because of their short, hairy bodies and wings. This fuzzy appearance makes them look similar to tiny moths. There are more than 2,600 described species in this family. Most of these species live in humid, tropical environments.

The life cycle of these flies involves several distinct stages. It begins when a female lays between 30 and 100 eggs. She typically places these eggs just above the water line in moist drains. Within 48 hours, the eggs hatch into larvae, which are often called drain worms. The larval stage lasts between 9 and 15 days, depending on the species and the temperature. These larvae are nearly transparent, shaped like thin cylinders, and possess a non-retractable black head. They live in aquatic or sludge-based habitats, such as bathroom sinks or sewage systems.

Because they live in wet environments, the larvae have specialized breathing mechanisms. They cannot absorb oxygen directly from the water like some other aquatic insects. Instead, they breathe through a small, dark tube called a spiracle located on their posterior end. This means they must regularly reach the water surface to obtain oxygen. Some species use attachment disks on their ventral side to secure themselves to surfaces. The larval body is divided into segments called annuli, which are rings around the body. While many find them annoying, the larvae can be beneficial by eating bacteria and sludge. Their strong jaws can even help cut through hair and waste that might cause clogs.

After the larval stage, the insect enters the pupal stage. This stage lasts between 20 and 40 hours. During this time, the insect does not eat. It remains submerged near the water surface, still breathing through its spiracle. Eventually, the insect undergoes metamorphosis to become an adult. The adult fly emerges by bursting through a seam in its pupal casing. Once on the surface, the adult fly is much broader than the larva. It holds its hairy wings in a shape that looks like a pitched roof. These wings have very simple venation, consisting mostly of parallel veins without crossveins.

Adult Psychodidae are typically nocturnal, meaning they are most active at night. They are erratic fliers, moving in shaky or unpredictable patterns. They are often attracted to lights and certain odors. Some adults can also be seen running rapidly across surfaces during the day. An adult fly typically lives for about 20 days. Most adults will breed only once in their lifetime. This breeding often occurs within just a few hours of emerging from the pupal stage.

While many drain flies are harmless, some members of the family are more significant to human health. The subfamily Phlebotominae is hematophagous, which means they feed on blood. In some countries, these are called sand flies. While the term sand fly is also used for other insects like horse flies, these specific Psychodidae can transmit diseases. For example, the species Sycorax silacea can transmit microfilaria. Other species, like Clogmia albipunctata, are not known to carry human diseases, though they can be a nuisance. In some cases, inhaling insect fragments may cause asthma.

Scientists have discovered that this family has a very long history on Earth. We know this through fossils preserved in various types of amber. For instance, species like Datzia bispina are found in Burmese amber from the Late Cretaceous period. Other fossils, such as those in Baltic amber, date back to the Eocene epoch. We also find specimens in Lebanese amber from the Barremian age of the Early Cretaceous. These ancient remains show that the diverse lineages of Psychodidae have existed for millions of years.