Calliphoridae

Some flies are shiny and bright.

They can be blue or green. These flies are called blowflies.

They lay small eggs that look like white rice. Soon, tiny maggots hatch from the eggs. The maggots eat things like old meat or dung.

They grow by shedding their skin. The maggots then hide in the dirt. They stay there until they turn into flies. These flies help the world by cleaning up.

Blowflies are a large family of insects. There are almost 1,900 known species. Many adults look very shiny. They often have blue, green, or black bodies.

Female blowflies need protein to make eggs. They lay eggs that look like tiny grains of rice. These eggs are white or yellow. A female can lay about 2,000 eggs in her life.

Soon, small larvae hatch from the eggs. We call these larvae maggots. They are often used as fishing bait. Maggots eat things like dung or dead animals. They use mouth hooks to grind food. They also use special liquids to break down proteins.

As they grow, maggots go through three stages. They must shed their skin to grow. This is called molting. After they grow, they hide in the ground. They stay there until they become adult flies.

Many animals eat blowflies. Spiders, beetles, frogs, and birds all eat them. Some flies even help by visiting flowers for food.

Blowflies belong to a large family of insects called Calliphoridae. There are almost 1,900 known species in this group. Many adults have shiny bodies with metallic colors. You might see blue, green, or black colors on them.

These flies are very important in nature. They help break down things like dung and dead animals. Some people even use their larvae, called maggots, as fishing bait. These tiny creatures are known as gentles by some.

Life begins with tiny eggs that look like rice grains. These eggs are usually white or yellow in color. A single female can lay about 2,000 eggs in her life.

Most females lay about 150 to 200 eggs at one time. After about 8 hours to a day, the eggs hatch. The larvae then go through three stages of growth. They must shed their skin, or molt, to get bigger.

Growing up is a busy process for a maggot. They use dark mouth hooks to grind up their food. They also use special liquids called enzymes to break down proteins. This helps them eat things like livestock or carcasses. The temperature around them changes how fast they grow.

For example, a black blowfly called Phormia regina grows in certain ways. At room temperature, it can change from an egg to a pupa in 150 to 266 hours. This is about six to 11 days.

Scientists have studied these flies for a long time. They look closely at tiny hairs called bristles to tell species apart. They also study how flies interact with tiny microbes. Some flies even have special ways to fight off germs.

In the Chihuahuan desert of Mexico, a fungus can affect bluebottle flies. This fungus grows through the fly and can kill it. Researchers also study how blowflies affect animals and humans. This is called myiasis, which happens when larvae live in a host.

Blowflies are part of a big world of insects. They live in many places, from the Neotropics to Africa. Many species like loose, damp soil to live in.

You might see them near flowers that smell like rotting meat. They use nectar from these flowers for energy to fly. Other animals, like spiders, frogs, and birds, eat them. This shows how every living thing is connected in a food web. Even a small fly has a very big job to do.

Calliphoridae is a large family of insects within the order Diptera. This group contains almost 1,900 known species. They are commonly known by many names, including blowflies, carrion flies, bluebottles, and greenbottles. These insects play vital roles in ecosystems by breaking down organic matter. While some species are considered pests, they are essential parts of the natural world.

Adult blowflies are often easy to recognize by their appearance. They frequently have shiny, metallic bodies with colors like blue, green, or black. Scientists identify specific species by looking at tiny, hair-like bristles. For example, all members of this family have bristles located on the meron. They also have specific patterns of bristles on the thorax and head.

Their antennae are three-segmented and possess a structure called an arista. This arista is plumose, meaning it is feathery along its entire length.

The life cycle of a blowfly begins with eggs. These eggs are usually white or yellowish and look like small grains of rice. A single female is typically iteroparous, meaning she lays multiple batches of eggs throughout her life. While one batch might contain 150 to 200 eggs, a female may lay around 2,000 eggs in total. Most eggs have a 50:50 sex ratio. However, two species in the genus Chrysomya are exceptions. They can be arrhenogenic, producing only males, or thelygenic, producing only females.

Once the eggs hatch, the larvae, or maggots, begin their development. This process involves three distinct stages called instars. Each instar is separated by a molting event where the larva sheds its skin. The larvae are poikilothermic, so their growth rate depends heavily on the surrounding temperature. For instance, the black blowfly *Phormia regina* can develop from egg to pupa in 150 to 266 hours at 20 °C.

To eat, the larvae use dark mouth hooks to grind food. They also release proteolytic enzymes to break down proteins in their food source.

Blowflies interact with complex microbial environments. They often live in substrates like carrion or dung that are full of bacteria. Some species, like *Lucilia sericata*, can actually digest certain bacteria, such as *Escherichia coli*. Research shows that blowflies have specific immune responses to different germs. They use pathways called the IMD and Toll pathways to fight specific pathogens. This helps them manage the microbes they encounter while feeding.

Despite their ecological roles, some blowflies cause economic and health issues. This is often through a condition called myiasis, where larvae live in the tissues of animals or humans. In Australia, the sheep blowfly *Lucilia cuprina* causes losses of about AU$170 million every year. Another notable example is the New World primary screwworm, *Cochliomyia hominivorax*. This species was once a major pest in the southern United States. It was eventually eradicated there through a massive program that released sterilized males.

Blowflies are found in many different habitats across the globe. They are common in temperate and tropical areas with loose, damp soil. There are 120 species located in the Neotropics, with many more in Africa and Southern Europe. While their larvae are scavengers, the adults can act as occasional pollinators. They are attracted to flowers that have strong odors, such as the American pawpaw. These flies use nectar to get the carbohydrates they need for flight. This connects them to the wider world of flowering plants and energy cycles.