THE PREHISTORIC A–Z
Explore the letter A
A research index of dinosaur genus names, including names whose status has changed.
1,888 names catalogued from Wikipedia’s genus list on 11 October 2026. Inclusion does not establish that a name is a valid dinosaur genus. Historical or disputed names are marked for review. Names without a field note link go to the source overview.
- Aachenosaurus ↗Historical / disputed: review source
- Aardonyx ↗Source index entry
- Abdarainurus ↗Source index entry
- Abditosaurus ↗Source index entry
- Abelisaurusdinosaur · Cretaceous
- Abrictosaurus ↗Source index entry
- Abrosaurus ↗Source index entry
- Abydosaurus ↗Source index entry
- Acantholipan ↗Source index entry
- Acanthopholis ↗Source index entry
- Achelousaurusdinosaur · Cretaceous
- Acheroraptor ↗Source index entry
- Achillesaurus ↗Source index entry
- Achillobatordinosaur · Cretaceous
- Acristavus ↗Source index entry
- Acrocanthosaurusdinosaur · Cretaceous
- Acrotholus ↗Source index entry
- Actiosaurus ↗Historical / disputed: review source
- Adamantisaurus ↗Source index entry
- Adasaurus ↗Source index entry
- Adelolophus ↗Source index entry
- Adeopapposaurus ↗Source index entry
- Adratiklit ↗Source index entry
- Adynomosaurus ↗Source index entry
- Aegyptosaurus ↗Source index entry
- Aeolosaurus ↗Source index entry
- Aepisaurus ↗Source index entry
- Aepyornithomimus ↗Source index entry
- Aerosteon ↗Source index entry
- Aetonyx ↗Historical / disputed: review source
- Afromimus ↗Source index entry
- Afrovenatordinosaur · Jurassic
- Agathaumas ↗Historical / disputed: review source
- Aggiosaurus ↗Historical / disputed: review source
- Agilisaurus ↗Source index entry
- Agnosphitys ↗Historical / disputed: review source
- Agrosaurus ↗Historical / disputed: review source
- Agujaceratops ↗Source index entry
- Agustinia ↗Source index entry
- Ahshislepelta ↗Source index entry
- Ahshislesaurus ↗Source index entry
- Ahvaytum ↗Source index entry
- Airakoraptor ↗Historical / disputed: review source
- Ajancingenia ↗Historical / disputed: review source
- Ajkaceratops ↗Source index entry
- Ajnabia ↗Source index entry
- Akainacephalus ↗Source index entry
- Alamosaurusdinosaur · Cretaceous
- Alamotyrannus ↗Historical / disputed: review source
- Alashansaurus ↗Historical / disputed: review source
- Alaskacephale ↗Source index entry
- Albalophosaurus ↗Source index entry
- Albertaceratops ↗Source index entry
- Albertadromeus ↗Source index entry
- Albertavenator ↗Source index entry
- Albertonykus ↗Source index entry
- Albertosaurusdinosaur · Cretaceous
- Albinykus ↗Source index entry
- Albisaurus ↗Historical / disputed: review source
- Alcovasaurus ↗Historical / disputed: review source
- Alectrosaurus ↗Source index entry
- Aletopelta ↗Source index entry
- Algoasaurus ↗Source index entry
- Alioramusdinosaur · Cretaceous
- Aliwalia ↗Historical / disputed: review source
- Allosaurusdinosaur · Jurassic
- Almas ↗Source index entry
- Alnashetri ↗Source index entry
- Alocodon ↗Source index entry
- Alpkarakush ↗Source index entry
- Altirhinus ↗Source index entry
- Altispinax ↗Source index entry
- Alvarezsaurusdinosaur · Cretaceous
- Alwalkeria ↗Historical / disputed: review source
- Alxasaurus ↗Source index entry
- Amanasaurus ↗Historical / disputed: review source
- Amanzia ↗Source index entry
- Amargasaurusdinosaur · Cretaceous
- Amargastegos ↗Historical / disputed: review source
- Amargatitanis ↗Source index entry
- Amazonsaurus ↗Source index entry
- Ambopteryx ↗Source index entry
- Ammosaurus ↗Historical / disputed: review source
- Ampelognathus ↗Source index entry
- Ampelosaurus ↗Source index entry
- Amphicoelias ↗Source index entry
- Amphicoelicaudia ↗Historical / disputed: review source
- Amphisaurus ↗Historical / disputed: review source
- Amtocephale ↗Source index entry
- Amtosaurus ↗Historical / disputed: review source
- Amurosaurus ↗Source index entry
- Amygdalodon ↗Source index entry
- Anabisetia ↗Source index entry
- Analong ↗Source index entry
- Anasazisaurus ↗Source index entry
- Anatosaurus ↗Historical / disputed: review source
- Anatotitan ↗Historical / disputed: review source
- Anchiceratops ↗Source index entry
- Anchiornisdinosaur · Jurassic
- Anchisaurusdinosaur · Jurassic
- Andesaurus ↗Source index entry
- Andhrasaurus ↗Historical / disputed: review source
- Angaturama ↗Historical / disputed: review source
- Angloposeidon ↗Historical / disputed: review source
- Angolatitan ↗Source index entry
- Angulomastacator ↗Source index entry
- Angustungui ↗Historical / disputed: review source
- Anhuilong ↗Source index entry
- Aniksosaurus ↗Source index entry
- Animantarx ↗Source index entry
- Ankistrodon ↗Historical / disputed: review source
- Ankylosaurusdinosaur · Cretaceous
- Anodontosaurus ↗Source index entry
- Anomalipes ↗Source index entry
- Anoplosaurus ↗Source index entry
- Anserimimus ↗Source index entry
- Antarctopelta ↗Source index entry
- Antarctosaurus ↗Source index entry
- Anteavis ↗Source index entry
- Antetonitrusdinosaur · Jurassic
- Anthodon ↗Historical / disputed: review source
- Antrodemus ↗Historical / disputed: review source
- Anzudinosaur · Cretaceous
- Aoniraptor ↗Source index entry
- Aorun ↗Source index entry
- Apatodon ↗Historical / disputed: review source
- Apatoraptor ↗Source index entry
- Apatosaurusdinosaur · Jurassic
- Appalachiosaurusdinosaur · Cretaceous
- Aquilarhinus ↗Source index entry
- Aquilops ↗Source index entry
- Arackar ↗Source index entry
- Aragosaurus ↗Source index entry
- Aralosaurus ↗Source index entry
- Aratasaurus ↗Source index entry
- Araucanoraptor ↗Historical / disputed: review source
- Archaeoceratops ↗Source index entry
- Archaeocursor ↗Source index entry
- Archaeodontosaurus ↗Source index entry
- Archaeopteryxdinosaur · Jurassic
- Archaeoraptor ↗Source index entry
- Archaeornis ↗Historical / disputed: review source
- Archaeornithoides ↗Source index entry
- Archaeornithomimusdinosaur · Cretaceous
- Arcovenator ↗Source index entry
- Arctosaurus ↗Historical / disputed: review source
- Arcusaurus ↗Source index entry
- Ardetosaurus ↗Source index entry
- Arenysaurus ↗Source index entry
- Argentinosaurusdinosaur · Cretaceous
- Argyrosaurus ↗Source index entry
- Aristosaurus ↗Historical / disputed: review source
- Aristosuchus ↗Source index entry
- Arizonasaurus ↗Historical / disputed: review source
- Arkansaurus ↗Source index entry
- Arkharavia ↗Source index entry
- Arrhinoceratops ↗Source index entry
- Arrudatitan ↗Source index entry
- Arstanosaurus ↗Source index entry
- Asfaltovenator ↗Source index entry
- Asiaceratops ↗Source index entry
- Asiamericana ↗Source index entry
- Asiatosaurus ↗Source index entry
- Asiatyrannus ↗Source index entry
- Asilisaurus ↗Historical / disputed: review source
- Astigmasaura ↗Source index entry
- Astrodon ↗Source index entry
- Astrodonius ↗Historical / disputed: review source
- Astrodontaurus ↗Historical / disputed: review source
- Astrophocaudia ↗Source index entry
- Asylosaurus ↗Source index entry
- Atacamatitan ↗Source index entry
- Athenar ↗Source index entry
- Atlantosaurus ↗Source index entry
- Atlasaurus ↗Source index entry
- Atlascopcosaurus ↗Source index entry
- Atrociraptor ↗Source index entry
- Atsinganosaurus ↗Source index entry
- Aublysodon ↗Source index entry
- Aucasaurusdinosaur · Cretaceous
- Augustia ↗Historical / disputed: review source
- Augustynolophus ↗Source index entry
- Auroraceratops ↗Source index entry
- Aurornis ↗Source index entry
- Australodocus ↗Source index entry
- Australotitan ↗Source index entry
- Australovenatordinosaur · Cretaceous
- Austrocheirus ↗Source index entry
- Austroposeidon ↗Source index entry
- Austroraptordinosaur · Cretaceous
- Austrosaurus ↗Source index entry
- Avaceratopsdinosaur · see sources
- Avalonia ↗Historical / disputed: review source
- Avalonianus ↗Historical / disputed: review source
- Aviatyrannis ↗Source index entry
- Avimimusdinosaur · Cretaceous
- Avipes ↗Historical / disputed: review source
- Avisaurus ↗Historical / disputed: review source
- Azendohsaurus ↗Historical / disputed: review source