Dinosaurs A to Z

Dinosaurs beginning with the letter A

On the following pages we have assembled an ever growing library of dinosaurs for your reference.  (Current article count is: 367)

If you encounter any errors or typos or if you would like to request that a specific type of Dinosaur be added to the list, please take a moment to EMAIL US and let us know.

Name Era Description
Aachenosaurus Non-Existent Not a dinosaur; Upon examination determined to simply be an unusual piece of petrified wood
Abdallahsaurus nomen nudum, most likely Brachiosaurus or Giraffatitan
Abelisaurus
Abrictosaurus
Abrosaurus
Acanthopholis
Achelosaurus Common misspelling of Achelousaurus
Achelousaurus
Achillesaurus
Achillobator
Acracanthus Original invalid name of Acrocanthosaurus
Acrocanthosaurus
Actiosaurus Most likely a misinterpreted ichthyosaur
Adamantisaurus
Adasaurus
Aegyptosaurus
Aeolosaurus
Aepisaurus
Aetonyx Probably a junior synonym of Massospondylus
Afrovenator
Agathaumas
Aggiosaurus Actually a metriorhynchid crocodilian
Agilisaurus
Agnosphitys
Agrosaurus Probably a junior synonym of Thecodontosaurus
Agujaceratops
Agustinia
Airakoraptor nomen nudum
Alamosaurus
Alashansaurus nomen nudum
Alaskacephale
Albertaceratops
Albertosaurus
Albisaurus Not a dinosaur; Believed instead to be a non-dinosaurian reptile
Alectrosaurus
Aletopelta
Algoasaurus
Alioramus
Aliwalia Junior synonym of Eucnemesaurus
Allosaurus
Alocodon
Altirhinus
Altispinax
Alvarezsaurus Probably not a dinosaur; Common belief is that it was some actually some sort of bird
Alwalkeria
Alxasaurus
Amargasaurus
Amargatitanis
Amazonsaurus
Ammosaurus
Ampelosaurus
Amphicoelias
Amphicoelicaudia nomen nudum, possibly Huabeisaurus
Amphisaurus Preoccupied name for what is now known as Anchisaurus
Amtosaurus Possibly Talarurus
Amurosaurus
Amygdalodon
Anabisetia
Anasazisaurus
Anatosaurus Junior synonym of Edmontosaurus
Anatotitan
Anchiceratops
Anchisaurus
Andesaurus
Angaturama Probable junior synonym of Irritator
Angloposeidon nomen nudum
Aniksosaurus
Animantarx
Ankistrodon Actually a proterosuchid archisauriform
Ankylosaurus
Anodontosaurus Junior synonym of Euoplocephalus or Dyoplosaurus
Anoplosaurus
Anserimimus
Antarctopelta
Antarctosaurus
Antetonitrus
Anthodon Actually a pareiasaur
Antrodemus Possibly a junior synonym of Allosaurus
Apatodon Possibly a junior synonym of Allosaurus
Apatosaurus More commonly known as Brontosaurus
Appalachiosaurus
Aragosaurus
Aralosaurus
Araucanoraptor The nomen nudum of Neuquenraptor
Archaeoceratops
Archaeodontosaurus
Archaeopteryx Actually a bird (by definition)
Archaeoraptor Now known as the bird Yanornis and the dromaeosaur Microraptor
Archaeornis Junior synonym of the bird Archaeopteryx
Archaeornithoides
Archaeornithomimus
Archaeovolans Junior synonym of the bird Yanornis
Arctosaurus Not a dinosaur; Believed instead to be some sort of non-dinosaurian reptile
Argentinosaurus
Argyrosaurus
Aristosaurus Junior synonym of Massospondylus
Aristosuchus
Arizonasaurus Actually a rauisuchian
Arkanosaurus Common misspelling of Arkansaurus
Arkansaurus nomen nudum
Arrhinoceratops
Arstanosaurus
Asiaceratops
Asiamericana
Asiatosaurus
Astrodon
Astrodonius Junior synonym of Astrodon
Astrodontaurus Junior synonym of Astrodon
Atlantosaurus Possible junior synonym of Apatosaurus or Camarasaurus
Atlasaurus
Atlascopcosaurus
Atrociraptor
Aublysodon
Aucasaurus
Augustia Preoccupied name for what is now known as Agustinia
Auroraceratops
Australodocus
Austrosaurus
Avaceratops
Avalonia Preoccupied name for what is now known as Avalonianus
Avalonianus Not a dinosaur; Believed instead to be a non-dinosaurian archosaur
Aviatyrannis
Avimimus
Avipes Not a dinosaur; Believed instead to be a non-dinosaurian dinosauromorph
Avisaurus Not a dinosaur; Actually an enantiornithine bird
Azendohsaurus Not a dinosaur; Believed instead to be a non-dinosaurian reptile


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