Dinosaurs receive their scientific names through a formal process governed by international rules that have been in place, in some form, since the mid-1800s. Every new dinosaur species must be described in a peer-reviewed publication, anchored to a physical specimen, and given a two-part Latin or Latinized name following the same system used for all animals. The process sounds tidy on paper, but in practice it involves creative wordplay, bitter rivalries, political disputes over fossil ownership, and occasional reversals that can erase or resurrect a famous name decades after it was first coined.
Where the Names Actually Come From
A dinosaur’s name is always a binomial, meaning it has two parts: a genus name (like Tyrannosaurus) and a species name (like rex). Both parts are usually built from Greek or Latin roots, though the rules allow borrowing from any language as long as the result is Latinized. Richard Owen established the word “dinosaur” itself in 1841 by combining the Greek words deinos (terrible) and sauros (lizard), and that spirit of descriptive combination has guided naming ever since.
Most dinosaur names fall into a few broad categories based on what inspired them. Descriptive names highlight a physical trait: Triceratops means “three-horned face,” and Pachycephalosaurus means “thick-headed lizard.” Geographic names reference where the fossil was found, such as Coloradisaurus, named after the Los Colorados Formation in Argentina. Others honor people, which is a category with its own complications discussed further below. And a handful are playful or culturally referential, like Dracorex hogwartsia, a nod to the Harry Potter universe.
The naming scientist has real creative freedom here. There is no rule requiring the name to be descriptive or geographic. As long as the word can be Latinized and does not duplicate an existing animal name, it can be almost anything. That freedom has produced names drawn from Indigenous languages, mythologies, pop culture, and occasionally from the discoverer’s own sense of humor.
The Rulebook Behind Every Name
Creative as the naming process can be, every dinosaur name must satisfy the International Code of Zoological Nomenclature, commonly shortened to the ICZN. This code is the rulebook for naming all animals, from beetles to blue whales to long-extinct sauropods. It does not judge whether a name is good or bad, clever or dull. It only determines whether a name is available, which in nomenclature terms means formally valid and eligible to be used in science.
To be available, a new name must appear in a work that qualifies as “published” under the code’s strict definition. For most of the code’s history, that meant print. But a 2012 amendment expanded the rules to recognize electronic publications, with conditions: the work must be registered in ZooBank (the official online registry for zoological nomenclature) before publication, must state its own publication date, and must include evidence of that registration.1The Bulletin of Zoological Nomenclature. Amendment of Articles 8, 9, 10, 21 and 78 of the International Code of Zoological Nomenclature to expand and refine methods of publication The amendment also specified that only the final, immutable version of an electronic work counts; preprints and early online versions posted before the final form do not establish priority.2The Bulletin of Zoological Nomenclature. Electronic publications need registration in ZooBank to be available
ZooBank’s launch as the official ICZN registry marked a significant shift for the field.3Zootaxa. A new era in zoological nomenclature and taxonomy: ICZN accepts e-publication and launches ZooBank Before it existed, tracking which names had been published and when depended on physical library records and personal correspondence. Now, new names can be looked up in a centralized database, which reduces (though does not eliminate) the problem of accidental duplication.
The Specimen That Anchors the Name
A name alone is not enough. Every new species must be tied to a physical specimen, called a holotype, that serves as the permanent reference point for what that species is. If future scientists disagree about whether a newly found fossil belongs to the same species, they compare it against the holotype. The holotype does not have to be a complete skeleton. It can be a single bone, a tooth, or a partial skull, as long as the describing scientist argues it has features distinctive enough to define the species.
This requirement creates real-world complications, because the holotype has to be preserved somewhere accessible. It must be housed in a recognized institution, usually a museum or university collection, where other researchers can examine it. The specimen cannot live in a private collection or a commercial warehouse and still serve as a valid holotype. This is one of the places where fossil ownership and scientific naming intersect in ways that get contentious.
Countries with rich fossil beds have developed legal frameworks to keep important specimens within their borders. Brazil, for instance, has legislation specifying that holotypes, name-bearing specimens making up a set percentage of any collected group, and other fossils deemed to be of national interest cannot be exported.4Royal Society Open Science. Digging deeper into colonial palaeontological practices in modern day Mexico and Brazil These laws exist partly as a response to a long history of fossils being removed from countries in the Global South by researchers from wealthier nations, a practice that has left many holotypes sitting in European and North American museums, far from where they were found.
When Names Get Revoked, Merged, or Resurrected
A dinosaur name is not permanent in the way most people assume. Names can be sunk (declared invalid because they turn out to be the same species as something named earlier), split (when what was thought to be one species is shown to contain two or more), or declared a nomen dubium, meaning “doubtful name,” when the holotype is too fragmentary to be diagnostic.
The nomen dubium designation is surprisingly common in paleontology, because many early dinosaur species were described from scrappy material. Camposaurus arizonensis, a Late Triassic theropod, was long considered a doubtful name because its holotype consisted of fragmentary leg bones. A reassessment identified two features of those bones that were unique to the species, which was enough to rescue it from nomen dubium status and confirm it as a valid taxon.5Palaeontology. Taxonomic and phylogenetic reassessment of the early neotheropod dinosaur Camposaurus arizonensis from the Late Triassic of North America Not every species gets that second chance. Dozens of dinosaur names described in the 19th and early 20th centuries remain in taxonomic limbo because the original material simply is not good enough to tell them apart from their relatives.
The most famous naming reversal involves Brontosaurus. Named by O.C. Marsh in 1879, it was sunk into Apatosaurus in the early 1900s because scientists decided the two were not different enough to warrant separate genera. For over a century, paleontologists insisted that Brontosaurus was not a real name, even as the public kept using it. Then a 2015 study applied quantitative methods to re-evaluate the relationships among long-necked diplodocid dinosaurs and concluded that some species previously lumped under Apatosaurus were distinct enough to justify a separate genus, effectively resurrecting Brontosaurus as a valid name.6PubMed Central. A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda) Not all paleontologists accept this conclusion, but the study illustrated how naming decisions can swing back and forth as analytical methods improve.
The Bone Wars and the Problem of Naming in Haste
The messiest chapter in dinosaur naming history unfolded during the late 1800s, in the period often called the Bone Wars. Rival American paleontologists Edward Drinker Cope and Othniel Charles Marsh raced to name as many new species as possible, sometimes describing the same animal multiple times under different names because they were working too quickly to check. Their rivalry was personal and vicious, with each publicly accusing the other of fraud and ethical violations. Between them, Cope and Marsh contributed to the discovery of over 140 new dinosaur species, but many of those names were later sunk as duplicates or declared invalid.
The Bone Wars era left a lasting scar on dinosaur taxonomy. A significant fraction of the names coined during that period are now considered synonyms or nomina dubia, and sorting through the mess has occupied generations of paleontologists. The experience also helped motivate clearer rules about publication standards and type specimens. Before the Bone Wars, naming a species could be as simple as publishing a short description in a newsletter. Afterward, the community gradually demanded more rigorous evidence and more formal publication venues.
Who Gets Honored in a Dinosaur Name
Naming a dinosaur after a person is one of the most visible ways to honor someone in science. Lambeosaurus honors Canadian paleontologist Lawrence Lambe. Leaellynasaura was named after the daughter of its discoverers. These honorific names, called eponyms, have grown more common over time and often attract popular attention precisely because they attach a human story to an ancient animal.
But the pattern of who gets honored is strikingly uneven. An analysis of eponymous species names across many groups of organisms found that the vast majority honor white men from wealthier countries. Among plants in the genus Aloe, only about 13% of eponyms honored women, and nearly half of those women were identified as partners or relatives of the namers rather than as independent scientists. Similar skews have been documented across birds, fishes, and parasitic worms, with female eponyms ranging from roughly 6% to 19% depending on the group.7PubMed Central. Naming the menagerie: creativity, culture and consequences in the formation of scientific names Dinosaur names are not exempt from this pattern. The scientists who have historically done the most naming were predominantly men working at well-funded institutions in Europe and North America, and they tended to name species after people in their own professional networks.
This has prompted growing debate within paleontology. Some researchers have argued for a more conscious effort to honor Indigenous communities, local collectors, and underrepresented scientists when coining new names. Others have pushed further, questioning whether eponymous naming should be curtailed altogether, since it effectively turns species names into monuments to individuals who may later prove controversial. The ICZN itself is neutral on this question; it does not evaluate whether a name is culturally appropriate, only whether it meets the technical requirements for availability.
Fossil Access and the Politics of Who Gets to Name
The question of who names a dinosaur is inseparable from the question of who has access to the fossil. In countries where fossils are considered national patrimony, like Brazil, Argentina, Mongolia, and China, laws restrict or prohibit the export of scientifically important specimens. These laws exist for good reason: the history of paleontology includes extensive removal of fossils from colonized or economically weaker countries, sometimes under agreements that were exploitative or outright illegal.4Royal Society Open Science. Digging deeper into colonial palaeontological practices in modern day Mexico and Brazil
When a holotype sits in a foreign museum, researchers in the country of origin face practical barriers to studying it. They may need travel funding, institutional affiliations that grant access, and visas, all of which can be difficult to arrange. This creates an asymmetry where the scientists most likely to name and describe fossils from a given region are not always from that region. Efforts to address this include repatriation of fossils, collaborative agreements that ensure local scientists are included as co-authors, and stricter enforcement of export laws.
In the United States, a different kind of access problem exists. Fossils found on private land belong to the landowner, and the commercial fossil market has expanded significantly since the 1980s, with the number of companies trading in fossils estimated to have doubled in that period.8History and Philosophy of the Life Sciences. Assumptions of authority: the story of Sue the T-rex and controversy over access to fossils When important specimens end up in private hands rather than museum collections, they become scientifically inaccessible. A dinosaur that cannot be examined by other researchers cannot serve as a valid holotype, and a species described from a privately held specimen risks having its name challenged on those grounds.
Naming Footprints and Other Traces
Not all dinosaur names refer to body fossils. Trace fossils, particularly footprints, have their own naming system. A dinosaur trackway can be given an ichnospecies name (from the Greek ichnos, meaning “trace”) that is entirely separate from the name of the animal thought to have made it. This is because you often cannot prove which species left a particular footprint. A three-toed track in Jurassic sandstone might have been made by any of several theropod species that lived in the same area.
The study of dinosaur tracks, called ichnology, faces its own set of challenges around naming. Tracks vary depending on the animal’s speed, the softness of the ground, and how much the print eroded before being preserved. Two very different-looking footprints might have been made by the same species under different conditions, and two similar-looking footprints might belong to unrelated animals with convergent foot shapes. Researchers use a mix of qualitative comparison and increasingly sophisticated quantitative methods, including statistical modeling and even artificial intelligence, to sort tracks into ichnotaxa and attempt to link them to trackmakers.
Why So Many Dinosaur Names Change
If you grew up learning one set of dinosaur names and now find half of them outdated, you are not imagining things. Dinosaur taxonomy is genuinely unstable compared to, say, mammal taxonomy, for a straightforward reason: the fossil record is incomplete. Most dinosaur species are known from only one or a few specimens, and those specimens are often missing key parts. When a new, more complete fossil turns up, it can reveal that two supposedly separate species were actually juveniles and adults of the same animal, or that a species placed in one genus actually belongs in another.
New analytical tools have accelerated this churn. CT scanning lets researchers examine internal bone structures without cutting into irreplaceable specimens. Computational phylogenetics allows quantitative comparison of hundreds of anatomical features at once, producing family trees that sometimes rearrange longstanding relationships. The Brontosaurus resurrection, for example, hinged on numerical approaches to measuring how different two genera needed to be before splitting them.6PubMed Central. A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda) These tools are powerful, but different research teams using different datasets or different analytical assumptions can reach different conclusions about the same group of animals, which is why some name changes remain contested for years.
The ICZN operates on a principle of priority: the oldest available name for a species is the valid one. If a species named in 1877 is later shown to be the same animal as one named in 1856, the 1856 name wins, regardless of which name is more popular. This is what killed Brontosaurus the first time around and what keeps paleontologists poring over dusty 19th-century descriptions. Priority protects stability in the long run, but it can make the naming landscape feel chaotic in the short term, especially for anyone trying to keep a museum exhibit label up to date.
Naming a Dinosaur From Start to Finish
In practical terms, the path from fossil discovery to official name goes roughly like this. A specimen is found in the field, either through systematic excavation or accidental discovery. It is collected, prepared (meaning the surrounding rock is carefully removed), and studied, a process that can take months to years. The describing scientist compares it against known species, identifies features they believe are unique, and writes up a formal description that includes the new binomial name, a diagnosis listing the distinguishing features, photographs or illustrations, and a designation of the holotype specimen along with the institution where it is housed.
The manuscript goes through peer review at a scientific journal. Reviewers may challenge the diagnosis, question whether the features cited are truly unique, or argue that the specimen belongs to an existing species. If the paper is accepted and published in a code-compliant venue, the name becomes available. For electronic publications, the ZooBank registration must be completed before the paper goes live.2The Bulletin of Zoological Nomenclature. Electronic publications need registration in ZooBank to be available At that point, the name enters the scientific literature and other researchers can use it, challenge it, or build on it.
The whole process, from digging a fossil out of the ground to seeing its name in print, frequently takes five to ten years and sometimes much longer. Backlogs of undescribed specimens sit in museum drawers around the world, waiting for someone with the time and expertise to study them. Some of those specimens will eventually receive names. Others will be identified as members of already-known species. And a few will turn out to be too fragmentary to name at all, joining the ranks of the unnamed and the unnameable that make up a surprising share of the dinosaur fossil record.