Dinosaur That Starts With A

There are over 1000 known dinosaurs. This list includes every dinosaur that starts with A, including synonyms, excluding non-dinosaurs and birds (“Avian Dinosaurs”). Some prehistoric animals are often confused with dinosaurs. Those are not in our dinosaur list, but we added a second list at the bottom of this page for names of dinosaur-like animals that start with A. You’ll find a list of dinosaur-like animal names that starts with A at the bottom of this page.

Dinosaur That Starts With A:

Dinosaur Names

Time Period

Dinosaur Type

Location

Aardonyx

195 Mya

Saurischia

South Africa

Abdallahsaurus (=Giraffatitan)

150–145 Ma

Sauropod

Tanzania

Abditosaurus

70

Sauropod

Spain

Abdarainurus

85–72.1

Sauropod

Asia

Abelisaurus

80

Sauropod

Argentina

Abrictosaurus

199–196

Ornithischia

South Africa

Abrosaurus

168–161

Sauropod

Asia

Abydosaurus

104.5

Sauropod

USA

Acantholipan

83

Ankylosauria

Mexico

Acanthopholis

97

Ankylosauria

England

Achelousaurus

74

Ceratopsia

North America

Acheroraptor

67-66

Dromaeosauridae

USA

Achillesaurus

85

Theropoda

Argentina

Achillobator

96-89

Dromaeosauridae

Russia

Acristavus

79

Hadrosauridae

USA

Acrocanthosaurus

125-100

Theropoda

USA

Acrotholus

84-83

Pachycephalosauria

Canada

Adamantisaurus

75

Sauropod

South America

Adasaurus

70-68

Dromaeosauridae

Asia

Adelolophus

78

Hadrosauridae

North America

Adeopapposaurus

200-183

Massospondylidae

Argentina

Adratiklit

168–164

Stegosauridae

Morocco

Adynomosaurus

70

Hadrosauridae

Spain

Aegyptosaurus

100-96

Sauropod

Africa

Aeolosaurus

83-66

Sauropod

South America

Aepisaurus

100.5

Sauropod

France

Aepyornithomimus

75

Ornithomimidae

Mongolia

Aerosteon

86-84

Megaraptora

Argentina

Aetonyx (= Massospondylus)

200-183

Massospondylidae

South Africa

Afromimus

112

Noasauridae

Niger

Afrovenator

167–157

Megalosauridae

North Africa

Agathaumas (probably =Triceratops)

66

Ceratopsidae

USA

Agilisaurus

168–161

Ornithischia

Asia

Agrosaurus (=Thecodontosaurus)

206–202

Thecodontosauridae

England

Agujaceratops

77

Ceratopsidae

USA

Agustinia

116-108

Sauropod

South America

Ahshislepelta

75.4

Ankylosauria

USA

Airakoraptor (=Kuru)

72-71

Dromaeosauridae

North America

Ajancingenia (=Heyuannia)

70-66

Oviraptoridae

China

Ajkaceratops

85

Ceratopsia

Europe

Ajnabia

68-66

Hadrosauridae

Morocco

Akainacephalus

76

Ankylosauridae

USA

Alamosaurus

70-66

Saltasauridae

America, Asia, Europe

Alaskacephale

80-69

Pachycephalosauria

Alaska

Albalophosaurus

130

Ceratopsia

Japan

Albertaceratops

77.5

Ceratopsidae

North America

Albertadromeus

77-76

Thescelosauridae

Asia And North America

Albertavenator

71

Troodontidae

Canada

Albertonykus

68.5

Alvarezsauridae

Canada

Albertosaurus

71-68

Tyrannosauridae

Canada

Albinykus 

87-85

Alvarezsauridae

Mongolia

Alcovasaurus

150

Stegosauridae

USA

Alectrosaurus

96

Alectrosaurus

Asia

Aletopelta

75.5

Aletopelta

USA

Algoasaurus

140–125

Sauropod

South Africa

Alioramus

70

Tyrannosauridae

Mongolia

Aliwalia (=Eucnemesaurus)

228

Sauropodomorpha

South Africa

Allosaurus

155-145

Allosauridae

North America

Almas

75-71

Troodontidae

Mongolia

Alnashetri

97

Maniraptora

Argentina

Alocodon

162

Ornithischia

Portugal

Altirhinus

125–100.5

Hadrosauroidea

Mongolia

Altispinax

140–133

Carnosauria

England

Alvarezsaurus

86-83

Alvarezsauridae

Argentina

Alwalkeria

228

-

India

Alxasaurus

113-111

Therizinosauria

Asia and North America

Amanzia

157

Sauropod

Switzerland

Amargasaurus

129–122

Sauropod

Argentina

Amargatitanis

129-123

Sauropod

Argentina

Amazonsaurus

125-100

Sauropod

Brazil

Ammosaurus (Anchisaurus)

200-195

Sauropodomorpha

USA

Ampelosaurus

70-66

Sauropod

France

Amphicoelias

150

Sauropod

USA

Amphicoelicaudia (=Huabeisaurus)

95-72

Sauropod

China

Amphisaurus (Now Anchisaurus)

200-195

Sauropodomorpha

USA

Amtocephale

83-84

Pachycephalosauria

North America, Asia

Amtosaurus – (probably a Talarurus)

90

Ornithischia

Mongolia

Amurosaurus

70-66

Hadrosauridae

Amygdalodon

180-172

Sauropod

Argentina

Anabisetia

95-92

Elasmaria

South America

Analong

170-168

Mamenchisauridae

China

Anasazisaurus

75

Hadrosauridae

USA

Anatosaurus (=Edmontosaurus)

68-66

Hadrosauridae

North America

Anatotitan (=Edmontosaurus)

68-66

Hadrosauridae

North America

Anchiceratops

72-71

Ceratopsidae

Canada

Anchisaurus

200-195

Sauropodomorpha

USA

Andesaurus

99.6-97

Sauropod

South America

Angaturama – (probably = Irritator)

110

Spinosauridae

Brazil

Angolatitan

91-89

Sauropod

South Africa

Angulomastacator

76.9

Hadrosauridae

USA

Anhuilong

174-162

Sauropod

China

Aniksosaurus

96-91

Compsognathidae

Argentina

Animantarx

104–98

Nodosauridae

North America

Ankylosaurus

68–66

Ankylosauridae

North America

Anodontosaurus

72.8-67

Ankylosauridae

Canada

Anomalipes

70

Caenagnathidae

China

Anoplosaurus

100

Nodosauridae

England

Anserimimus

70

Ornithomimidae

Mongolia

Antarctopelta

74-70

Ankylosauria

Antarctica

Antetonitrus

228-208.5

Sauropod

South Africa

Antrodemus ( probably =Allosaurus)

150

Allosauridae

USA

Anzu

67.2–66

Caenagnathidae

USA

Aoniraptor

96-91

Megaraptora

South America

Aorun

161

Alvarezsauroidea

China

Apatodon – (probably a Allosaurus)

156–145

Theropoda

USA

Apatoraptor

74

Caenagnathidae

Canada

Apatosaurus

152–151

Sauropod

North America

Appalachiosaurus

77

Eutyrannosauria

North America

Aquilarhinus

75

Hadrosauridae

USA

Aquilops

107

Ceratopsia

North America

Arackar

83-66

Sauropod

Chile

Aragosaurus

133-129

Sauropod

Spain

Aralosaurus

83

Hadrosauridae

Kazakhstan

Aratasaurus

111-108

Coelurosauria

Brazil

Araucanoraptor (=Neuquenraptor)

90

Dromaeosauridae

South America

Archaeoceratops

125

Ceratopsia

China

Archaeodontosaurus

186-165

Sauropod

Madagascar

Archaeornithoides

75

Troodontidae

Mongolia

Archaeornithomimus

96

Ornithomimidae

Asia

Arcovenator

74

Abelisauridae

France

Arcusaurus

196

Sauropodomorpha

South Africa

Argentinosaurus

96-92

Sauropod

Argentina

Argyrosaurus

70

Sauropod

Argentina

Aristosaurus (=Massospondylus)

200-183

Massospondylidae

South Africa

Aristosuchus

130-123

Compsognathidae

England

Arkansaurus

113

Ornithomimosauria

USA

Arkharavia

66

Sauropod

Russia

Arrhinoceratops

70

Ceratopsidae

Canada

Arrudatitan

72-68

Sauropod

Brazil

Arstanosaurus

85-84

Hadrosauroidea

Kazakhstan

Asfaltovenator

179-178

Allosauroidea

Argentina

Asiaceratops

125-99

Leptoceratopsidae

Uzbekistan

Asiatosaurus

122-112

Sauropod

Mongolia, China

Astrodon

112

Sauropod

USA

Astrodonius (= Astrodon)

112

Sauropod

USA

Astrodontaurus (=Astrodon)

112

Sauropod

USA

Astrophocaudia

112

Sauropod

USA

Asylosaurus

Late Triassic

Sauropodomorpha

England

Atacamatitan

105-66

Sauropod

South America

Atlantosaurus

150

Sauropod

USA

Atlasaurus

167-164

Sauropod

North Africa

Atlascopcosaurus

114

Ornithopoda

Australian

Atrociraptor

68.5

Dromaeosauridae

Canada

Atsinganosaurus

72-70

Sauropod

France

Aublysodon

75

Tyrannosauridae

USA

Aucasaurus

85-80

Abelisauridae

Madagascar

Augustia (=Agustinia)

116-108

Sauropod

Argentina

Augustynolophus

70-66

Hadrosauridae

USA

Auroraceratops

126-113

Ceratopsia

China

Australodocus

150-145

Sauropod

Tanzania

Australotitan

100-90

Sauropod

Australian

Australovenator

95

Megaraptora

Australia

Austrocheirus

76-70

Theropoda

Argentina

Austroposeidon

83-66

Sauropod

Brazil

Austroraptor

78-66

Dromaeosauridae

Canada

Austrosaurus

112-105

Sauropod

Australia

Avaceratops

77

Centrosaurinae

North America

Aviatyrannis

160-145

Tyrannosauroidea

Portugal

Avimimus

85-70

Oviraptorosauria

Mongolia

Animals Often Confused For Dinosaurs That Start With A

Aachenosaurus –  (petrified wood, confused for a fossil)

Archaeopteryx (probably closer to birds than dinosaurs)

Archaeornis – junior synonym of Archaeopteryx

Archaeoraptor (not a real dinosaur, but a fake fossil)

Archaeornis (=Archaeopteryx)

Archaeoraptor (Not a real dinosaur, but a fake fossil)

Actiosaurus – (=choristoderan)

Aggiosaurus – subsequently found to be a metriorhynchid crocodilian

Albisaurus – not a dinosaur but a reptile

Ambopteryx – bird

Anchiornis – a bird

Ankistrodonproterosuchid archosauriform and in fact older than the dinosaurs!

Anthodon – a pareiasaur

Arctosaurus – a reptile, but not a dinosaur

Arizonasaurus – a rauisuchian (and older than the dinosaurs)

Avalonianus (aka Avalonia)– is an archosaur

Avipes – probably a dinosauromorph, but not a dinosaur

Avisaurus – a bird

Azendohsaurus – A archosauromorph, related to crocodiles, but not a dinosaur

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