Order (biology)

Scientists group living things together.

They put related families in one group. This group is called an order.

An order sits between a class and a family. Some people add a group above it. They also add groups below it.

Different experts may not always agree. They might group things in different ways. There are no hard rules to follow.

Names for these groups often end in certain ways. For example, plant groups have special endings. This helps us know how they are grouped. It is a smart way to study life.

Scientists use a system to group all living things. One important group is called an order.

An order sits between a class and a family. You can think of it as a way to group related families together. Some experts add extra levels. They might add a superorder above the order. They might add a suborder below it.

Taxonomists are people who study and name these groups. They decide what belongs in an order. Sometimes, these experts do not agree. There are no hard rules for them to follow. Some groups are used by almost everyone. Other groups are used only a little bit.

Names for orders often follow a pattern. Order names usually start with a capital letter. Orders of plants and fungi use certain endings. For example, Dictyotales is a plant order. Orders of birds and fish use a different ending. Insect orders often use a name that means 'wing.'

Carl Linnaeus was a famous scientist. He was the first to use orders for all types of nature. He did this in his book from 1735. Some of his names are still used today. For example, Lepidoptera is the order for moths and butterflies.

Scientists use a special system to group all living things. One important level in this system is called an order.

An order sits between a class and a family. You can think of it as a way to group related families together. Some experts add extra levels to this ladder. They might add a superorder above the order. They might also add a suborder directly beneath it. This helps scientists organize the huge variety of life on Earth.

How an order works depends on the person studying it. These experts are called taxonomists. They decide which living things belong in a specific order. There are no hard rules for them to follow. Because of this, taxonomists do not always agree. Some groups are accepted by almost everyone in science. Other groups are only recognized by a few people.

Naming these groups often follows a specific pattern. Most order names start with a capital letter. The endings of the names change based on the type of life. For example, plant and fungi orders use the suffix -ales. Birds and fish use a Latin ending that means "having the form of." Many insect orders use a name that means "wing."

Mammals and reptiles do not have such consistent naming patterns.

We can look back to see how this system grew. A German botanist named Augustus Quirinus Rivinus first used the term. He used it for plants in the 1690s. Later, Carl Linnaeus applied it to all of nature. He did this in his book, Systema Naturae, in 1735.

Some of his names are still used today. The order Lepidoptera includes moths and butterflies. The order Diptera includes flies and mosquitoes.

Different sciences use these ranks in different ways. In botany, scientists often use the rank of superorder. In zoology, some people use even more levels. For instance, McKenna and Bell used grandorder and mirorder in 1997. Michael Novacek used them in 1986. Michael Benton placed them in a different spot in 2005. Even viruses have orders, which end in -virales.

In 2018, the group that studies viruses added even higher ranks.

In the study of life, scientists use a hierarchical system to organize organisms. One essential level in this system is called an order. An order is a taxonomic rank used to classify living things. In the Linnaean taxonomy system, it sits between the rank of class and the rank of family. You can think of an order as a way to group several related families together. This helps scientists manage the massive variety of life on Earth.

How an order is defined depends on the work of a taxonomist. A taxonomist is a scientist who specializes in naming and classifying organisms. These experts decide which living things belong in a specific order. They also decide if a particular order should be recognized at all. There are no hard rules that a taxonomist must follow when describing an order. Because of this, there is often no exact agreement among experts. Some orders are accepted almost universally by the scientific community. Other orders are recognized only rarely by most researchers.

Naming these groups often follows specific linguistic patterns. Most order names are written starting with a capital letter. The suffixes, or word endings, change depending on the type of organism. For example, orders of plants, fungi, and algae use the suffix "-ales," such as Dictyotales. Birds and fishes use a Latin suffix that means "having the form of," such as Passeriformes. Many insect orders use a suffix that means "wing." However, naming is less consistent for other groups. Mammals, reptiles, amphibians, and invertebrates use various endings like Primates or Anura.

In zoology, some scientists use even more levels to organize the hierarchy. While the order is a standard rank, extra levels can be inserted. A superorder is sometimes placed directly above the order. A suborder is placed directly beneath it. Some researchers have proposed even more specific ranks. In 1986, Michael Novacek inserted the ranks of grandorder and mirorder. In 1997, McKenna and Bell used these same two levels between superorder and order. Michael Benton suggested a different position for them in 2005. He placed them between the superorder and the magnorder.

The history of this system began centuries ago. The German botanist Augustus Quirinus Rivinus first introduced the order as a distinct rank. He used it to classify plants in his treatises during the 1690s. Later, Carl Linnaeus applied the concept consistently to all of nature. He included minerals, plants, and animals in his 1735 work, Systema Naturae.

For plants, Linnaeus used orders to subdivide larger classes into smaller, more comprehensible groups. Some plant families today still use these old Linnaean names, which are called descriptive family names. Examples include the names Palmae or Labiatae.

In the field of botany, the use of ranks has evolved over time. The ranks of subclass and suborder are used as secondary ranks. Subclass is defined as being above the order, while suborder is below it. The superorder rank is also commonly used in plant science. This specific naming style was initiated by the publications of Armen Takhtajan starting in 1966. In the 19th century, the meaning of these words shifted. Works by scientists like Augustin Pyramus de Candolle used the term for groups we now call families. By the 1905 International Botanical Congress, the word order was reserved for a higher rank.

Zoology and virology also utilize the rank of order in unique ways. In zoology, Linnaean orders often refer to natural groups. Some of these names have remained in use for a very long time. For instance, the order Lepidoptera includes moths and butterflies. The order Diptera includes flies, mosquitoes, midges, and gnats. Viruses also have an ordinal level in their classification. From 1991 to 2017, order was the highest rank used for viruses. These virus orders use the suffix "-virales." In 2018, the International Committee on Taxonomy of Viruses added even higher ranks, such as the realm.