Scientific names come from a system called binomial nomenclature, where every known species gets a unique two-part name built from Latin or Latinized words. The first part identifies the genus (a group of closely related species), and the second part, called the specific epithet, distinguishes that particular species within the genus. Humans, for example, are Homo sapiens, red maple is Acer rubrum, and white oak is Quercus alba.
Why Latin, and Who Started This?
The system traces back to the Swedish naturalist Carl Linnaeus, who published Systema Naturae in 1735 and Species Plantarum in 1753. These two works launched a revolution in how scientists organized and talked about living things. By the tenth edition of Systema Naturae in 1758, Linnaeus had developed an elaborate classification scheme that became the foundation for naming animals. The 1753 date marks the starting point for plant names, and 1758 for animals.
Latin was the common language of European scholarship at the time, so Linnaeus built his system around it. Even today, every scientific name must be Latinized, meaning it has to be structured and pronounced as if it were Latin, regardless of where the word actually originates. A name can draw from Greek, Arabic, a person’s surname, or even be a completely invented string of letters, as long as it takes a Latin form.
What the Two Parts Actually Mean
The genus name is a noun. Acer means “maple.” Quercus means “oak.” The specific epithet that follows typically plays one of three grammatical roles: it can be an adjective describing the organism, a possessive noun honoring a person, or a noun placed beside the genus name. So Quercus alba literally translates to “white oak,” Pinus palustris means “swamp pine,” and Pinus elliottii means “pine of Stephen Elliott.”
The genus name is always capitalized, the specific epithet is always lowercase, and the whole name is italicized. You’ll sometimes see a letter or abbreviation after the name, like Quercus alba L. That “L.” stands for Linnaeus, crediting him as the person who first described the species. A multiplication sign before a name signals a hybrid: the commercial strawberry, Fragaria × ananassa, is a cross between two species.
Where the Words Come From
Most scientific names are rooted in Latin or ancient Greek, and they tend to describe something observable about the organism. Color is common: rubrum means red, alba means white, nigra means black. Habitat shows up frequently too, as in palustris for swampy environments or maritima for coastal ones. Shape, size, behavior, and geographic origin all serve as inspiration.
Many species are named after people. Microbiologists have a long tradition of honoring whoever discovered or characterized an organism. Salmonella is named after Daniel Salmon, the veterinary surgeon listed as first author on the original publication, even though his employee Theobald Smith actually did the lab work. Listeria monocytogenes honors the pioneering surgeon Joseph Lister, though he had nothing to do with its discovery. These naming credits don’t always land where you’d expect.
How Each Name Fits Into a Bigger System
The two-part name is just the most specific level of a much larger hierarchy. Every species belongs to a genus, every genus to a family, every family to an order, and so on up through class, division (or phylum), and kingdom. Red maple illustrates this neatly: Acer rubrum sits within the genus Acer (about 152 maple species), inside the family Sapindaceae (about 5,700 species of woody plants with lobed or compound leaves), which itself falls within progressively broader groupings all the way up to the plant kingdom, encompassing roughly 326,000 species. The binomial name pins down exactly which single species you’re talking about.
Who Makes the Rules
There is no single authority for all of life. Animals fall under the International Code of Zoological Nomenclature, maintained by the ICZN. Plants, algae, and fungi follow the International Code of Nomenclature for algae, fungi, and plants, most recently updated as the Madrid Code in 2024. Bacteria, viruses, and cultivated plants each have their own separate codes.
These codes are not law. No one gets fined for breaking them. Instead, they function through voluntary consensus: the global scientific community agrees to follow the rules so that names published in compliance can achieve international acceptance. Breaking the rules simply means your proposed name won’t be recognized by other researchers.
What It Takes to Name a New Species
Naming a species isn’t as simple as picking a word you like. A researcher must publish a formal description in a scientific work that meets specific criteria. The description needs to include the new binomial name, a statement of what taxonomic rank it belongs to, a diagnosis explaining how it differs from related species, and a general description of its characteristics.
Critically, the researcher must designate a holotype: a single preserved physical specimen that permanently anchors the name. This specimen has to be deposited in a museum, herbarium, or other public institution where other scientists can access it indefinitely. A holotype serves as the ultimate reference point. If a researcher in the future catches a bird and wants to confirm its species, they can compare it directly against the holotype. The large-billed reed warbler, for instance, was rediscovered after 139 years by checking wild-caught birds against its original holotype specimen. For animals, the publication must also be registered in ZooBank, the official registry of zoological nomenclature.
Under the botanical code, a type can be a preserved specimen on a herbarium sheet, a culture of an alga or fungus frozen in a metabolically inactive state, or in limited cases an illustration. A type cannot currently be a DNA sequence, though that discussion is ongoing.
What Happens When Two Names Collide
Because scientists working in different countries or eras sometimes independently describe the same species, naming conflicts are inevitable. The codes resolve this with the Principle of Priority: the valid name of a species is the oldest available name applied to it. If a name currently in use turns out to be younger than an earlier name for the same species, the older name takes precedence. The newer name becomes a “synonym,” essentially retired from active use. There are exceptions, particularly when the ICZN or its botanical counterpart rules that an older name would cause more confusion than stability, but priority is the default.
The Debate Over Offensive Names
A growing conversation in taxonomy concerns species names that honor controversial historical figures or contain language now considered offensive. A 2024 paper in the Proceedings of the National Academy of Sciences called on international nomenclature bodies to establish committees for assessing ethical concerns and revising names where necessary. The authors pointed out that the codes already require name changes for grammatical errors like incorrect gender endings, making the argument that refusing to change offensive names on grounds of “stability” is inconsistent.
The pushback is significant. A paper in BioScience signed by more than 1,500 scientists argued that bulk name changes could disrupt databases, confuse scientific communication, and distract from more urgent priorities like conservation. They also raised the concern that what counts as acceptable shifts over time, potentially creating a cycle of endless revision. The debate remains unresolved, with no formal mechanism yet in place under either major code to mandate ethical review of existing names.