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: Carnivore.Size: 7-8 meters long.Time Period: Generally considered to be of the
Hauterivian to Barremian ages of the early Cretaceous. However further
study of the sediments at the Tiouraren formation suggest that they
actually represent the Bathonian to Oxfordian stages of the mid
Jurassic.
Diet: Herbivore.Size: Roughly estimated at up to ten meters long,†‬but
this estimate is far from certain due to lack of overall remains.Time Period: Maastrichtian of the Cretaceous.
Diet: Herbivore.Size: Between 1.2 and 1.7 meters long.Time Period: Bathonian to Callovian of the Jurassic.
Diet: Herbivore.Size: Uncertain due to lack of remains.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Estimated†‬15†‬meters long.Time Period: Aptian to Albian of the Cretaceous.
Diet: Herbivore.Size: Uncertain.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Uncertain due to lack of remains,†‬but
estimated about†‬1†‬meter long.Time Period: Santonian of the Cretaceous.
Diet: Herbivore.Size: Uncertain due to lack of fossils,†‬but
holotype individual very roughly estimated to be about†‬2.6†‬meters
long.Time Period: Maastrichtian of the Cretaceous.
Diet: Herbivore.Size: Holotype roughly about†‬3.75†‬meters long.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Estimated around†‬20â€-24 ‬meters long,â€
‬based
upon comparison between more complete juvenile remains and partial
adult remains. Some isolated remains suggest larger.Time Period: Maastrichtian of the Cretaceous.
Diet: Herbivore.Size: Unknown due to lack of fossil remains,†‬but
comparison to similar pachycephalosaur dinosaurs suggests a rough
estimate of about†‬2.4†‬meters long.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Unknown due to lack of remains.Time Period: Valanginian/Hauterivian of the
Cretaceous.
Diet: Herbivore.Size: Roughly up to 6†‬meters long.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Roughly estimated about†‬1.5-1.6†‬meters
long.Time Period: Campanian of the Cretaceous.
Diet: Carnivore.Size: Uncertain due to lack of†‬remains.Time Period: Maastrichtian of the Cretaceous.
Diet: Carnivore.Size: Most about 8-9 meters long, largest individuals grew to about ‬10†‬meters
long.Time Period: Campanian of the Cretaceous
Diet: Insectivore�Size: Uncertain†‬due to lack of remains,†‬but
estimated to be about†‬1kg in weight.Time Period: Santonian of the Cretaceous.
Diet: Herbivore.Size: Roughly estimated at about†‬5.7†‬meters long.Time Period: Late Jurassic.
Diet: Carnivore.Size: Approximately 5 meters long.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: About†‬6†‬meters long.Time Period: Campanian of the Cretaceous.
Diet: Carnivore.Size: Up to†around 6 meters long.Time Period: Maastrichtian of the Cretaceous.
Diet: Carnivore.â€Size: 8.5†‬meter average body length,†‬with some
individuals approaching†‬9.7†‬meters long.†‬Some fragmentory
specimens have been interpreted as coming from animals†‬12†‬meters
long.Time Period: Kimmeridgian to Tithonian of the
Jurassic.
Diet: Carnivore.Size: Unavailable.Time Period: Campanian of the Cretaceous.
Diet: Carnivore/Insectivore.Size: Uncertain due to lack of remains.Time Period: Cenomanian of the Cretaceous.
Diet: Omnivore.Size: Unknown.Time Period: Mid Jurassic.
