Opiliones

These bugs have very long legs.

They look like spiders. But they are not spiders. They do not make webs. They are safe for you.

Their bodies look like one oval shape. Spiders have two body parts. These bugs have only one. They also have one pair of eyes.

Some bugs have very short legs. Most have very long legs. They use their long legs to feel things. This helps them find their way.

They eat many things. They eat small bugs. They also eat plants and fungi. Some even eat dead things.

They can be brown. Some have bright colors. They live all over the world. They live on every land except Antarctica.

Many people call these creatures harvestmen. You might also know them as daddy long legs.

They look like spiders, but they are different. Spiders have two body parts. Harvestmen have a single oval body.

Spiders have many eyes. Most harvestmen have just one pair of eyes. They use their long legs to feel things. These legs act like antennae, which are feelers used to explore.

Harvestmen are not dangerous to people. They do not have venom. They also do not make silk or webs.

These animals eat many different things. They eat small insects and plants. Some even eat fungi or dead things. This is unusual for arachnids. Most other arachnids only hunt live prey.

Some harvestmen live in groups. They can gather in large crowds. This helps them stay safe from predators.

Fossils show they have been around for a long time. Some fossils are 400 million years old. They look almost the same today. This means their body shape has not changed much.

You might know these creatures as daddy long legs or harvestmen. They are part of a group called Opiliones. People often mistake them for spiders, but they are actually a very different kind of arachnid.

While spiders have two separate body parts, harvestmen have a single oval body. This happens because their cephalothorax and abdomen are fused together. They also have only one pair of eyes in the middle of their head. Most spiders have three or four pairs of eyes around the edges of their head.

Harvestmen have a very interesting way of moving through the world. Because their eyes cannot form clear images, they rely on their legs. Their second pair of legs is much longer than the others. These long legs act like antennae, which are feelers used to explore.

They use these legs to sense what is around them. Most harvestmen are omnivores, meaning they eat many different things. They eat small insects, plants, and even fungi. Some are scavengers that eat dead things or bird dung.

Scientists have found that these animals have been around for a very long time. Fossils have been discovered in Scotland that are 400 million years old. There are also fossils found in France that are 305 million years old.

These ancient fossils look surprisingly modern. This shows that their basic body shape has changed very little over millions of years. It is amazing to think they have looked this way for so long. Scientists use these fossils to study how they are related to other arachnids.

There are over 6,650 known species of harvestmen living all over the world. Some scientists believe there might actually be more than 10,000 species.

They live on every continent except for Antarctica. In 2014, scientists named five different suborders to help group them. These groups are Cyphophthalmi, Eupnoi, Dyspnoi, Laniatores, and Tetrophthalmi. Some harvestmen are tiny, measuring less than 1 mm long. However, the largest species, Trogulus torosus, can grow as long as 1 cm.

Living together can be a smart way to stay safe. Many harvestmen are gregarious, which means they like to live in large groups. Some groups can have more than 70,000 individuals!

Staying in a crowd helps protect them from predators. If a predator attacks, the harvestmen can use scent glands to release a smelly fluid. This fluid can be quite unpleasant to animals that try to eat them. They also use camouflage to hide among leaves and dirt. This helps them blend into the ground so they are not seen.

The Opiliones are a diverse order of arachnids. They are commonly known by names like harvestmen, daddy long legs, or granddaddy long legs.

While they look like spiders, they belong to a distinct group. There are over 6,650 discovered species worldwide. Some scientists believe the total number of living species may exceed 10,000. They are found on every continent except Antarctica.

To understand a harvestman, you must look at its body structure. Unlike spiders, which have a narrow waist, harvestmen have fused body regions. Their body consists of two tagmata, or main parts. These are the anterior cephalothorax, also called the prosoma, and the posterior abdomen, or opisthosoma. Because these parts are joined broadly, the body looks like a single oval.

This is one of the easiest ways to tell them apart from spiders. Most harvestmen also have a single pair of eyes located in the middle of the cephalothorax. Spiders usually have three or four pairs of eyes around the edges of their heads.

Harvestmen have unique ways of interacting with their environment. Their eyes cannot form clear images, so they rely on touch. The second pair of legs is often much longer than the others. These legs function like antennae or feelers to explore the world.

Their feeding apparatus is called the stomotheca. It is formed by extensions of the first pair of legs and the pedipalps. Most arachnids only eat liquids, but the stomotheca allows harvestmen to swallow chunks of solid food. This allows them to be omnivores. They eat insects, plants, fungi, and even dead organisms or bird dung.

Scientists have organized the Opiliones into five distinct suborders. These groups were named in 2014: Cyphophthalmi, Eupnoi, Dyspnoi, Laniatores, and Tetrophthalmi.

Each suborder has different traits. For example, Cyphophthalmi are often small and live in soil. Many species in other groups, like the Laniatores, can grow quite large. Some species are very tiny, measuring less than 1 mm. However, the largest known species, Trogulus torosus, can reach 1 cm in length. Their leg spans can be much larger than their bodies, sometimes exceeding 10 cm in Southeast Asia.

We know that harvestmen have existed for a very long time. Fossils have been found in the Rhynie cherts of Scotland, which are 400 million years old. Other fossils were found in 305-million-year-old rocks in France.

These fossils look surprisingly modern. This tells us their basic body shape developed very early in history. Their exact place in the arachnid family tree is still being studied. They may be most closely related to camel spiders, known as Solifugae. Or, they might belong to a larger group that includes horseshoe crabs and scorpions.

Harvestmen use several methods to protect themselves from predators. Some use crypsis, which is a form of camouflage. They use patterns or colors to blend into leaves or dirt. Others use aposematism, which means using bright colors to warn predators. Some species also have defensive scent glands called ozopores. When disturbed, these glands secrete a smelly fluid. In some species, this fluid contains noxious quinones that taste bad to predators. Some harvestmen even live in massive groups, called aggregations, to stay safe. These groups can contain more than 70,000 individuals!

Reproduction in Opiliones is also quite interesting. Most species reproduce sexually through direct copulation. Unlike most other arachnids, males have a penis.

In some species, males provide a "nuptial gift" from their chelicerae to the female. Some males even show paternal care. This means the father stays to guard the eggs and clean them. This behavior has evolved independently at least three different times in different groups. This shows how complex and varied the lives of these ancient creatures can be.