Scolopendridae

Some big bugs are called centipedes.

Most have 21 pairs of legs. Some have even more legs. Some types have no eyes at all. They are blind.

Three types can live in water and on land. This is very neat. Some have different venom. This is the liquid they use to hunt.

Very old bugs like these lived long ago. They lived in a place called Brazil. These bugs are very special.

Scolopendridae is a family of large centipedes. The name comes from Greek words. One word means thorn. The other word means earthworm.

Most of these centipedes have 21 pairs of legs. Some have more. One type has 39 or 43 pairs of legs. Most also have simple eyes called ocelli. They have four ocelli on each side of the head. But some types are eyeless. These centipedes are blind.

Some of these bugs are very special. Three types from Asia can live in water. They can also live on land. This is called amphibious behavior. Other types have different venom. Venom is the liquid they use to hunt. In two types, the venom is different for males and females.

These bugs have been around for a long time. Scientists found a fossil of an extinct type. It lived in Brazil. This was during the Early Cretaceous period. It was called Cratoraricrus.

Scolopendridae is a family of large centipedes. The name comes from Ancient Greek words. One word means thorn. The other word means earthworm. These creatures are part of the class Chilopoda. They are interesting to study because they vary so much. Some species look very different from others. This makes them a very diverse group of animals.

Most members of this family have a specific body plan. They usually have 21 pairs of legs. However, some exceptions exist in nature. The species Scolopendropsis bahiensis has 21 or 23 pairs. Another species, Scolopendropsis duplicata, has 39 or 43 pairs. Most also have four ocelli on each side of their head. Ocelli are simple eyes. Some species like Cormocephalus sagmus are eyeless and blind.

Some of these centipedes have very special ways of living. Three Asian species show amphibious behavior. These are Scolopendra cataracta, Scolopendra paradoxa, and Scolopendra alcyona. This means they can live in water and on land. Other species have unique venom. Venom is the liquid used to hunt. In Scolopendra hardwickei and Hemiscolopendra marginata, the venom is different for males and females. This is called sexual dimorphism.

We can find traces of these animals in the deep past. The earliest record is from an extinct genus. It is named †Cratoraricrus. This animal lived in the Crato Formation of Brazil. It lived during the Early Cretaceous period. This shows that these centipedes have existed for a very long time. Scientists use fossils to learn about these ancient lives.

Many different groups live within this family. These groups are called genera. Some include Scolopendra and Rhysida. Others include Otostigmus and Ethmostigmus. There are also subfamilies like Otostigminae and Scolopendrinae. Each group has its own special history. Learning about them helps us see how many ways life can grow. They are a big part of the natural world.

Scolopendridae is a large family of centipedes. These animals belong to the class Chilopoda. The name for this family comes from two Ancient Greek words. One word, skólops, means "thorn." The other word, énteron, means "earthworm." This name describes these large, striking creatures. They are important for scientists to study because they show many different body types. They also show how animals adapt to different environments.

Most centipedes in this family share a similar body plan. They typically have 21 pairs of legs. They also usually have four ocelli on each side of their head. Ocelli are simple eyes that help them sense light. However, nature provides several interesting exceptions to these rules. The species Scolopendropsis bahiensis has either 21 or 23 pairs of legs. The species Scolopendropsis duplicata is even more unusual. It can have 39 or 43 pairs of legs.

Some members of the Scolopendridae family have adapted to live without sight. Several species are completely eyeless and blind. These include Cormocephalus sagmus, Cormocephalus pyropygus, and Cormocephalus delta. Other species have developed unique ways to interact with their surroundings. Three Asian species show amphibious behavior. These are Scolopendra cataracta, Scolopendra paradoxa, and Scolopendra alcyona. Being amphibious means they can live both on land and in water.

Scientists also study how venom works in these animals. Venom is the toxic liquid used for hunting. In some species, the venom changes based on the sex of the centipede. This is known as sexual dimorphism. This term describes physical differences between males and females of the same species. Two species show this trait: Scolopendra hardwickei and Hemiscolopendra marginata. Research published in 2019 studied these dramatic differences in their venom systems.

We can trace the history of this family back millions of years. The earliest record of Scolopendridae is an extinct genus called †Cratoraricrus. This ancient animal lived during the Early Cretaceous period. Scientists found its remains in the Crato Formation of Brazil. This fossil evidence proves that this family has existed for a very long time. It shows how centipedes have survived through different eras of Earth's history.

This family is organized into many different groups called genera. One large group is the subfamily Otostigminae. This group includes tribes like Otostigmini and Sterropristini. Many genera live here, such as Alipes, Alluropus, and Otostigmus. Another major group is the subfamily Scolopendrinae. This group contains the well-known genus Scolopendra. It also includes genera like Asanada and Psiloscolopendra.

Understanding these groups helps scientists map out the diversity of life. The family is split into many specific branches. For example, the tribe Otostigmini includes genera like Digitipes and Ethmostigmus. The subfamily Scolopendrinae includes the genus Scolopendropsis. Each of these names represents a specific way the centipede body has evolved. By studying these many parts, we learn how life becomes so varied.