Theridiidae

Many spiders live in our homes.

These spiders make messy webs. They use sticky silk to catch bugs. Some webs hang from the ground. This helps them trap ants.

Some spiders have a special comb. This comb is on their leg. It helps them work with silk.

One spider looks like a smiley face. It has a yellow body. It has a funny pattern.

These spiders are found all over the world.

Many spiders live in our homes. These are called Theridiidae spiders.

They are also known as tangle-web spiders. This family is very large. It has around 3,000 different species. They live all over the world.

These spiders have a special tool. They have a comb of tiny bristles on their fourth leg. They use this to work with silk. Unlike some spiders, they spin sticky silk to catch prey.

Some spiders build webs that hang from the ground. These webs use sticky silk to trap ants.

Some spiders in this group are very famous. The black widow is a well-known member.

Scientists study them to learn about venom. Other spiders, like the Anelosimus, help us study how spiders live in groups.

Some spiders have funny patterns. The Hawaiian happyface spider has a yellow body. It has a pattern that looks like a grin.

This spider helps us learn about how colors change in a species.

Theridiidae spiders are a huge family of living things. People often call them tangle-web spiders or comb-footed spiders.

This group is very diverse and lives all over the world. They are the most common spiders you might find inside human homes. There are around 3,000 different species in this family. These species are split into 128 different groups called genera. Scientists first described this large family in 1833. A man named Carl Jakob Sundevall was the one who named them.

These spiders have a very special way of working with silk. They are ecribellate, which means they spin sticky silk to catch prey. This is different from spiders that spin woolly silk.

To help them, they have a comb of tiny bristles on their fourth leg. These bristles are called setae. They use this comb to manage their silk. Many of them build gumfoot-webs to catch food. These webs use frame lines to anchor to things nearby. They also use support threads that have sticky, viscid silk on them.

Researchers use these spiders to learn many things about science. Some are model organisms, which means they are used for important studies. The widow spiders are very important for studying venom. Scientists look at how this venom affects the body. Other spiders, like the Anelosimus, help us study sociality. This is the study of how living things live in groups. Some Anelosimus species live alone, but others live in permanent social groups. Because these social groups are highly inbred, they are also good for studying inbreeding. Scientists also study the Hawaiian happyface spider to learn about color.

There are many different kinds of webs in this family. Some spiders build tangle webs that look like messy knots. Others build webs that hang near the ground to trap ants.

These spiders use elastic, sticky silk lines that lead to the soil. These webs stay in one place for a long time. Spiders will expand and repair them instead of making new ones. Some tiny spiders called Argyrodinae live in the webs of bigger spiders. They are called kleptoparasites because they steal food from the host. They might eat the host's prey or even the host itself.

This family has many large groups of species. The largest genus is called Theridion, which has over 600 species. Another large group is Parasteatoda, which includes the common house spider in North America.

You can see how different they are by looking at their patterns. For example, the happyface spider has a yellow body with a grin. This grin looks like a smiley face or a clown face.

These spiders are part of a much bigger world of insects and arachnids. They show us how different shapes and lives can exist in one family.

Theridiidae is a massive family of araneomorph spiders. They are known by several common names. People often call them tangle-web spiders, cobweb spiders, or comb-footed spiders.

This family is incredibly diverse and lives all over the globe. It is the most common group of arthropods found in human homes worldwide. Scientists first described this family in 1833. A researcher named Carl Jakob Sundevall provided the first formal description. Today, we know the family includes around 3,000 different species. These species are organized into 128 different genera.

These spiders have unique biological traits that set them apart. They are classified as entelegyne spiders. This means the females possess a specific genital plate. They are also ecribellate spiders. This term describes how they spin sticky capture silk instead of woolly silk.

To manage this silk, they use a specialized tool. They have a comb of serrated bristles called setae. These bristles are located on the tarsus, which is the end of the fourth leg. This physical structure is a key feature of the family.

Web building is a central part of their survival. Many species build tangle space webs. These webs can be very diverse in form. Some spiders build gumfoot-webs to catch prey. These webs use frame lines to anchor to the surroundings. They also use support threads that contain viscid silk.

Some webs have a central retreat, known as the Achaearanea-type. Others have a peripheral retreat, known as the Latrodectus-type. Some webs contain viscid silk, while others are sheet-like. The Coleosoma-type web is an example of a sheet-like web without viscid silk.

Some members of this family have even more complex lifestyles. The Argyrodinae are a group of kleptoparasitic spiders. This includes the genera Argyrodes, Faiditus, and Neospintharus. These spiders live inside the webs of much larger spiders. They act as thieves by stealing small prey caught in the host's web.

They may also consume the silk from the host's web. In some cases, they even attack and eat the host spider itself.

Because of their unique traits, many theridiids are model organisms. Model organisms are species used by scientists to study specific biological processes. The widow spiders are medically important for research. Scientists study their venom and how it manifests clinically in the body.

Other species are used to study spider silk and sexual biology. This includes the study of sexual cannibalism. The genus Anelosimus is used to study sociality. Some Anelosimus species are solitary, while others are permanently social. Because social species are highly inbred, they also help study inbreeding.

Genetic diversity is also studied within this family. The Hawaiian spider, Theridion grallator, is a famous example. It is often called the "happyface" spider. This is because certain color morphs have patterns on their yellow bodies. These patterns look like a smiley face or a grinning clown face.

Scientists use this spider to understand the genetic basis of color polymorphism. Polymorphism refers to when a single species has many different physical forms.

Taxonomy, the science of naming and classifying life, shows the family's scale. The largest genus is Theridion, which contains over 600 species. However, this genus is not monophyletic, meaning it does not share a single common ancestor. Another large genus is Parasteatoda. This genus includes the North American common house spider. The family's vast number of genera, such as Latrodectus and Argyrodes, highlights its complexity. These spiders represent a vital part of global ecosystems and scientific research.