Cecidomyiidae

These flies are very tiny.

They have long feelers on their heads. Their wings have tiny hairs on them. Many of them are orange or yellow.

Some of these flies live in plants. The babies eat the plant parts. This makes the plant grow strange bumps.

Some babies are even helpful. They eat other tiny bugs that hurt crops. This helps the plants stay healthy.

There are many kinds of these flies in the world.

Gall midges are a very large family of flies.

Most are tiny. Many are less than 1 millimeter long. They have long antennae, which are feelers on their heads. Their wings are often hairy. Many of these flies are orange or yellow. This color comes from something called carotenoids. They can make these colors themselves.

Many gall midges live inside plants. The larvae, or baby flies, eat the plant tissue. This makes the plant grow strange bumps called galls.

Some species can be pests. For example, the Hessian fly hurts wheat. Other types can damage rice, coffee, or fruit.

But some gall midges are helpful. Their larvae are predators. This means they eat other small bugs. They often eat aphids and spider mites. These other bugs can hurt crops. By eating them, the midges help plants stay healthy.

Scientists think there are many more species than we know. One study in Canada found over 16,000 species. There may be over 1 million species in the world.

Gall midges are a huge family of tiny flies.

Most of these insects are very small. Many are less than 1 millimeter long. Some can grow up to 8 millimeters. They are known for having long antennae. These antennae often have many segments. Their wings are usually clear and have tiny hairs.

Many species look orange or yellow. This color comes from carotenoids. These are the same things that make carrots orange. These flies are special because they can make these colors themselves. Scientists think they might have gotten the genes for this from fungi.

Most gall midges have a very interesting way of life. The larvae, or baby flies, live inside plant tissue. As they eat, they cause the plant to grow strange bumps. These bumps are called galls.

Some species show a strange thing called paedogenesis. This is when the larvae reproduce before they even grow up. In some cases, the baby larvae actually eat the mother. In other species, they reproduce later as an egg or a pupa. This shows how complex their life cycles can be.

Scientists have been studying these flies for a long time. Many different researchers have worked to name them. For example, R. J. Gagné wrote a major manual about them in 1981. Another researcher named B. M. Mamaev wrote about them in 1988. These experts help us understand how many different types exist. They use many tools to sort the different groups. This helps us see how the family is organized.

There are more gall midges than we might think. Scientists have described over 6,650 species so far. However, this is likely a very small number.

A 2016 study in Canada found over 16,000 species. This suggests there might be over 1 million species in the whole world. A 2023 study found they are one of the most diverse groups of insects. They make up about 20% of all insects caught in certain traps. They are a dominant part of the insect world.

Gall midges can be both pests and helpers. Some species, like the Hessian fly, damage wheat crops.

Others can hurt rice, coffee, or fruit. But many are actually very helpful to farmers. Some larvae are predators that eat tiny pests like aphids.

One type, Aphidoletes aphidimyza, is even sold in the United States. It helps protect crops in greenhouses by eating harmful bugs.

Cecidomyiidae is a massive family of flies commonly known as gall midges or gall gnats. These insects are famous for how their larvae interact with plants. As the larvae feed on plant tissue, they trigger the plant to grow abnormal structures called galls.

These galls provide shelter and food for the developing insects. While they are often very small, they play a massive role in the world's ecosystems. They are among the most diverse groups of animals on Earth.

Physically, gall midges are delicate and tiny. Most adults measure between 0.5 and 3.0 mm in length. Some larger species can reach up to 8 mm, with wings spanning 15 mm.

They are characterized by long antennae that often have many segments. These antennae feature specialized sensory hairs or loop-shaped filaments. Their wings are usually clear and covered in tiny hairs called microtrichia. Interestingly, many species appear orange or yellow. This color comes from carotenoids, which are organic pigments. While many animals get these pigments from food, Cecidomyiidae may be able to synthesize them themselves. Scientists believe they might have acquired the genes for this through horizontal gene transfer from fungi.

The life cycles of these flies can be quite unusual. Most follow a standard path from egg to larva to pupa. However, some species exhibit a phenomenon called paedogenesis. This is a process where the larval stage reproduces before reaching maturity. In certain species, the daughter larvae actually consume the mother. In other cases, reproduction occurs during the egg or pupal stages.

This demonstrates the extreme biological variety found within this single family.

Scientists have worked for decades to classify this enormous group. Researchers like R. J. Gagné provided important manuals on the subject in 1981. B. M. Mamaev also contributed significant work in 1988. Because there are so many species, scientists use advanced tools like DNA metabarcoding to study them. This technology allows researchers to identify species from environmental samples. These studies have completely changed our understanding of how many gall midges actually exist.

The scale of their diversity is staggering. Currently, humans have described more than 6,650 species. However, this is likely just a tiny fraction of the truth. A 2016 study in Canada estimated there are over 16,000 species in that country alone. This suggests there could be over 1 million species worldwide.

A 2023 study found that Cecidomyiidae are a dominant part of insect diversity. In some global collections, they make up about 20% of all insect species caught.

Gall midges have a significant impact on agriculture. Some species are considered serious pests because they damage essential food crops. The Hessian fly is a well-known pest of wheat. Other species attack rice, coffee, soybeans, and various fruits like pears and raspberries.

For example, the Asian rice gall midge can harm rice production. These insects can cause economic losses by damaging the parts of the plant that humans use for food.

However, not all gall midges are harmful to humans. Many species act as natural helpers in the environment. Some larvae are predatory, meaning they hunt and eat other small insects. They often target pests like aphids and spider mites.

Because of this, they are used in biological control programs. In the United States, the species Aphidoletes aphidimyza is sold to help protect greenhouse crops. By eating harmful pests, these midges help maintain a healthy balance in many ecosystems.