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: Based upon comparison to skull size of other
ankylosaurs, the largest known remains of a 64 centimetres long skull
credits Ankylosaurus with being at least 6.25 meters in length. Lack of
overall fossils however makes more exact details uncertain.Time Period: Maastrichtian of the Cretaceous.
Diet: Herbivore.Size: Unavailable.Time Period: Campanian/Maastrichtian of the
Cretaceous.
Diet: Unknown.Size: Uncertain.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Uncertain.Time Period: Albian of the Cretaceous.
Diet: Uncertain but possible omnivore.Size: Estimated at†‬3†‬meters long.Time Period: Early Maastrichtian of the Cretaceous.
Diet: Herbivore.Size: Up to†‬4†‬meters long.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Uncertain due to incomplete and uncertainty of
attributable remains.†‬Lower estimates however have suggested a size
of around†‬18†‬meters long for the type species,†‬while other
material indicates an upper size of up to†‬30†‬meters long if the
classification is correct.†‬Refer to main text for details.Time Period: Coniacian to†‬Campanian of the
Cretaceous.
Diet: Herbivore.Size: Estimated about†‬8†‬-†‬10†‬meters long.â€
‬Possibly larger given that the holotype remains are probably those of
a juvenile/subadult.Time Period: Late Triassic.
Diet: Possible omnivore,†‬but uncertain.Size: Up to†‬1.5†‬meters high at the hips.Time Period: Late Maastrichtian of the Cretaceous.
Diet: Carnivore.Size: About†‬1†‬meter long for the holotype
specimen,†‬but this is of a juvenile,†‬adults would have been larger.Time Period: Late Jurassic.
Diet: Uncertain.Size: Unavailable.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Individuals roughly between 20-‬23†‬meters
long.Time Period: Kimmeridgian to early Tithonian of the
Jurassic.
Diet: Carnivore.Size: Juvenile specimen about 6.5 to 7 meters long. Fully grown adults likely larger.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Unknown.Time Period: Late†(‬Lower Campanian�) ‬Cretaceous.
Diet: Herbivore.Size: Skull†‬8.42†‬centimetres long.†‬Body length
estimated at about†‬60†‬centimetres long.Time Period: Mid Albian of the Cretaceous.
Diet: Herbivore.Size: Holotype estimated at†‬6.3†‬meters long,â€
‬though this is a juvenile.†‬Fully grown adults would have been larger.Time Period: Campanian/Maastrichtian of the
Cretaceous.
Diet: Herbivore.Size: Estimated about†‬18†‬meters long.Time Period: Late Hauterivian of the Cretaceous.
Diet: Uncertain due to lack of fossil material.Size: Roughly†‬8†‬meters long.Time Period: Campanian of the Cretaceous.
Diet: Carnivore.Size: Holotype individual roughly estimated to have
been about†‬3†‬meters long,†‬but this wa a juvenile.†‬Fully grown
adults likely larger.Time Period: Albian of the Cretaceous.
Diet: Herbivore.Size: Up to about 90†‬centimetres long.Time Period: Aptian of the Cretaceous.
Diet: HerbivorousSize: About 3.3 feet in lengthTime Period: late Sinemurian-Pliensbachian stages, Early Jurassic period
Diet: Herbivore.Size: Uncertain.Time Period: Bathonian of the Jurassic.
Diet: Carnivore.Size: Total size unknown due to lack of remains.â€
‬Skull roughly estimated to be about†‬5†‬centimetres long.Time Period: Campanian of the Cretaceous.
Diet: Uncertain,†‬but presumed omnivore.Size: Around†‬3.3†‬meters long.Time Period: Late Campanian of the Cretaceous.
Diet: Carnivore.Size: Estimated about†‬5†‬to†‬6†‬meters long.Time Period: Late Campanian of the Cretaceous.
