Dinosaurs That Start With A
Discover a complete list of over 130 dinosaurs that start with the letter A.
Each dinosaur listed has a dedicated page with information on classification, diet, size, fossil evidence, geographic distribution, and maps of known fossil locations, where available. Pages may also include size comparison charts, fossil representations, and in-depth descriptions based on current scientific research.
The amount of information varies by species, depending on the completeness of fossil discoveries.
Diet: Herbivore.Size: 6†‬meters long.Time Period: Hattangian to Sinemurian of the
Jurassic.
Diet: Herbivore.Size: Unknown due to lack of remains.Time Period: Late Cretaceous.
Diet: Herbivore.Size: Holotype roughly estimated to have been
around†‬17.5meters long.Time Period: Maastrichtian of the Cretaceous.
Diet: Carnivore.Size: Body estimated between†‬7†‬and†‬9†‬meters long.†‬Skull is measured at over†‬85†‬centimetres long.Time Period: Early Campanian of the Cretaceous.
Diet: Herbivore/Omnivore�Size: 1.2†‬meters long.Time Period: Hettangian to Sinemurian of the
Jurassic.
Diet: Herbivore.Size: Estimated around†‬9†‬meters long.Time Period: Bathonian/Callovian of the Jurassic.
Diet: Herbivore.Size: Uncertain due to lack of remains,†‬see main
text for more detail.Time Period: Albian of the Cretaceous.
Diet: Herbivore.Size: Unavailable.Time Period: Santonian of the Cretaceous.
Diet: Herbivore.Size: Skull up to 1.6 meter long.Time Period: Campanian of the Cretaceous.
Diet: Carnivore.Size: Uncertain due to lack of fossil remains,†‬but
scaling of known elements to related genera suggest a length of aboutâ€
‬2†‬meters.Time Period: Late Maastrichtian of the Cretaceous.
Diet: Insectivore.Size: Unavailable.Time Period: Santonian of the Cretaceous.
Diet: Carnivore.Size: Estimated†‬6†‬meters long.Time Period: Turonian to Campanian of the
Cretaceous,†‬although further study of the formation that Achillobator
came from suggests it may actually date between the Santonian and
Cenomanian of the Cretaceous.
Diet: Herbivore.Size: Uncertain, but probably similar to
contemporary hadrosaurids of the time.Time Period: Campanian of the Cretaceous.
Diet: Carnivore.â€Size: Up to†‬11.5†‬meters long.Time Period: Aptian to Albian of the Cretaceous.
Diet: Herbivore.Size: Unknown due to lack of remains.Time Period: Turonian to Maastricthian of the
Cretaceous.
Diet: Carnivore.Size: Holotype originally estimated to be around
2-2.4 meters in length, A second referred specimen suggests that this
dinosaur may have atrually approached 3.5 meters in lengthTime Period: Late†(‬late Campanian to early
Maastrichtianâ€) Cretaceous.
Diet: Herbivore.Size: Unknown due to lack of fossil remains.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: About†‬3†‬meters long.Time Period: Early Jurassic.
Diet: Herbivore.Size: Uncertain due to lack of overall remains.â€
‬Humerus†‬61†‬centimetres long.Time Period: Bathonian of the Jurassic.
Diet: Herbivore.Size: Unavailable.Time Period: Maastrichtian of the Cretaceous.
Diet: Herbivore.Size: Roughly estimated about ‬15†‬meters long.Time Period: Albian to Cenomanian of the Cretaceous.
Diet: Herbivore.Size: Estimated at†‬14†‬meters long,†‬quite
possibly larger.Time Period: Campanian of the Cretaceous.
Diet: Uncertain.Size: Unknown due to lack of remains.Time Period: Campanian of the Cretaceous.
Diet: Carnivore.Size: Estimated between 7.5 and 9 meters long.Time Period: Santonian of the Cretaceous.
Diet: Carnivore�Size: Tibia†‬40†‬centimetres long.†‬Full body
size unknown.Time Period: Aptian/Albian of the Cretaceous.
