List of dinosaur genera

s are a diverse group of reptiles that first appeared during the Triassic period, between 243 and 233.23 million years ago. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 million years ago, and their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record demonstrates that birds are modern feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic. Birds were therefore the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event approximately 66 million years ago, and constitute the only known living dinosaurs.
This list of dinosaurs is a comprehensive listing of all genera that have ever been considered to be non-avialan dinosaurs, but also includes some dinosaurs of disputed status as non-avian, as well as purely vernacular terms.
The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful, or were not formally published, as well as junior synonyms and genera that are no longer considered dinosaurs. Many listed names have been reclassified as everything from true birds to crocodilians to petrified wood. The list contains 1,863 names, of which approximately 1,424 are considered either valid dinosaur genera or nomina dubia.

Scope and terminology

There is no official, canonical list of all non-avian dinosaur genera. The closest is the Dinosaur Genera List, compiled by biological nomenclature expert George Olshevsky, which was first published online in 1995 and was regularly updated until June 2021. The most authoritative general source in the field is the second edition of The Dinosauria. The vast majority of names listed below are sourced to Olshevsky's list, and all subjective determinations are based on The Dinosauria, except where they conflict with primary literature. These exceptions are noted.
Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include:

Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assigned to the same genus, the first to be published is the senior synonym, and all other instances are junior synonyms. Senior synonyms are generally used, except by special decision of the ICZN, but junior synonyms cannot be used again for a different genus, even if deprecated. Junior synonymy is often subjective, unless the genera described were both based on the same type specimen.
Nomen nudum : A name that has appeared in print but has not yet been formally published by the standards of the ICZN. Nomina nuda are invalid, and are therefore not italicized as a proper generic name would be. If the name is later formally published, that name is no longer a nomen nudum and will be italicized on this list. Often, the formally published name will differ from any nomina nuda that describe the same specimen.
Nomen oblitum : A name that has not been used in the scientific community for more than fifty years after its original proposal.
Nomen manuscriptum : A name that appears in manuscript of a formal publication that has no scientific backing.
Preoccupied name: A name that is formally published, but which has already been used for another taxon. This second use is invalid and the name must be replaced. Preoccupied names are not valid generic names.
Nomen dubium : A name describing a fossil with no unique diagnostic features. As this can be an extremely subjective and controversial designation, no genera should be marked as such on this list.
A
Aachenosaurus – subsequently found to be a piece of petrified wood
Aardonyx
Abdarainurus
Abditosaurus
Abelisaurus
Abrictosaurus
Abrosaurus
Abydosaurus
Acantholipan
Acanthopholis
Achelousaurus
Acheroraptor
Achillesaurus
Achillobator
Acristavus
Acrocanthosaurus
Acrotholus
Actiosaurus – subsequently found to be a choristoderan
Adamantisaurus
Adasaurus
Adelolophus
Adeopapposaurus
Adratiklit
Adynomosaurus
Aegyptosaurus
Aeolosaurus
Aepisaurus
Aepyornithomimus
Aerosteon
Aetonyx – possible junior synonym of Massospondylus
Afromimus
Afrovenator
Agathaumas – possible synonym of Triceratops
Aggiosaurus – subsequently found to be a metriorhynchid crocodilian
Agilisaurus
Agnosphitys – possibly non-dinosaurian
Agrosaurus – probably a junior synonym of Thecodontosaurus
Agujaceratops
Agustinia
Ahshislepelta
Ahshislesaurus
Ahvaytum
"Airakoraptor" – nomen nudum; Kuru
Ajancingenia – synonym of Heyuannia
Ajkaceratops
Ajnabia
Akainacephalus
Alamosaurus
"Alamotyrannus" – nomen nudum
"Alashansaurus" – nomen nudum; Shaochilong
Alaskacephale
Albalophosaurus
Albertaceratops
Albertadromeus
Albertavenator
Albertonykus
Albertosaurus
Albinykus
Albisaurus – subsequently found to be a non-dinosaurian reptile
Alcovasaurus – possible junior synonym of Miragaia
Alectrosaurus
Aletopelta

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Algoasaurus
Alioramus
Aliwalia – junior synonym of Eucnemesaurus
Allosaurus
Almas
Alnashetri
Alocodon
Alpkarakush
Altirhinus
Altispinax
Alvarezsaurus
Alwalkeria
Alxasaurus
Amanasaurus – possibly non-dinosaurian
Amanzia
Amargasaurus
"Amargastegos" – nomen nudum
Amargatitanis
Amazonsaurus
Ambopteryx
Ammosaurus – junior synonym of Anchisaurus
Ampelognathus
Ampelosaurus
Amphicoelias
"Amphicoelicaudia" – nomen nudum; synonym of Huabeisaurus
"Amphisaurus" – preoccupied name, now known as Anchisaurus
Amtocephale
Amtosaurus – possible junior synonym of Talarurus
Amurosaurus
Amygdalodon
Anabisetia
Analong
Anasazisaurus
Anatosaurus – junior synonym of Edmontosaurus
Anatotitan – junior synonym of Edmontosaurus
Anchiceratops
Anchiornis
Anchisaurus
Andesaurus
"Andhrasaurus" – nomen nudum
Angaturama – possible junior synonym of Irritator
"Angloposeidon" – nomen nudum
Angolatitan
Angulomastacator
"Angustungui" – nomen nudum
Anhuilong
Aniksosaurus
Animantarx
Ankistrodon – subsequently found to be a proterosuchid archosauriform
Ankylosaurus
Anodontosaurus
Anomalipes
Anoplosaurus
Anserimimus
Antarctopelta
Antarctosaurus
Anteavis
Antetonitrus
Anthodon – subsequently found to be a pareiasaur
Antrodemus – possible synonym of Allosaurus
Anzu
Aoniraptor
Aorun
Apatodon – possible junior synonym of Allosaurus
Apatoraptor
Apatosaurus
Appalachiosaurus
Aquilarhinus
Aquilops
Arackar
Aragosaurus
Aralosaurus
Aratasaurus
"Araucanoraptor" – nomen nudum; Neuquenraptor
Archaeoceratops
Archaeocursor
Archaeodontosaurus
Archaeopteryx – possibly a bird
Archaeoraptor – a chimaera of the bird Yanornis and the dromaeosaur Microraptor
Archaeornis – junior synonym of Archaeopteryx
Archaeornithoides
Archaeornithomimus
Arcovenator
Arctosaurus – subsequently found to be a non-dinosaurian reptile
Arcusaurus
Ardetosaurus
Arenysaurus
Argentinosaurus
Argyrosaurus
Aristosaurus – possible junior synonym of Massospondylus
Aristosuchus
Arizonasaurus – subsequently found to be a rauisuchian
Arkansaurus
Arkharavia
Arrhinoceratops
Arrudatitan
Arstanosaurus
Asfaltovenator
Asiaceratops
Asiamericana – a fish
Asiatosaurus
Asiatyrannus
Asilisaurus – possibly non-dinosaurian
Astigmasaura
Astrodon
Astrodonius – junior synonym of Astrodon
Astrodontaurus – junior synonym of Astrodon
Astrophocaudia
Asylosaurus
Atacamatitan
Athenar
Atlantosaurus
Atlasaurus
Atlascopcosaurus
Atrociraptor
Atsinganosaurus
Aublysodon
Aucasaurus
"Augustia" – preoccupied name, now known as Agustinia
Augustynolophus
Auroraceratops
Aurornis
Australodocus
Australotitan
Australovenator
Austrocheirus
Austroposeidon
Austroraptor
Austrosaurus
Avaceratops
"Avalonia" – preoccupied name, now known as Avalonianus
Avalonianus – subsequently found to be a non-dinosaurian archosaur
Aviatyrannis
Avimimus
Avipes – probably a non-dinosaurian dinosauromorph
Avisaurus – subsequently found to be an enantiornithine bird
Azendohsaurus – subsequently found to be a non-dinosaurian archosauromorph