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: Estimated between†‬6.5†‬and†‬8†‬meters
long,†‬Skull†‬76†‬centimetres long.Time Period: Aptian to Albian of the Cretaceous.
Diet: Carnivore.Size: Highly uncertain, but roughly estimated to be
about 8 meters long.Time Period: Barremian of the Cretaceous.
Diet: Insectivore�Size: Estimated about†1.‬2†‬meters long.Time Period: Santonian of the Cretaceous.
Diet: Omnivore�Size: Uncertain.Time Period: Carnian to Norian of the Triassic.
Diet: Herbivore�Size: About†‬3.8†‬meters long.Time Period: Albian of the Cretaceous.
Diet: Herbivore.Size: Known individuals roughly estimated to be
about†‬8.5†‬to†‬9†‬meters long.Time Period: Kimmeridgian of the Jurassic.
Diet: Herbivore.Size: Holotype individuals neck length about 2.4
meters long. Total body
length unknown due to most of the tail being missing.Time Period: Barremian to Aptian of the Cretaceous.
Diet: Herbivore.Size: Estimated up to†‬12†‬meters long,†‬but lack
of remains make it impossible to be certain.Time Period: Aptian to Albian of the Cretaceous.
Diet: Omnivore�Size: Body estimated to be about†‬32†‬centimetres
long.†‬Possibly longer in older adults,†‬though probably not by much
if at all.Time Period: Oxfordian of the Jurassic.
Diet: Herbivore/Omnivore�Size: 4†‬meters long.Time Period: Pliensbachian through to the Bajocian
of the Jurassic.
Diet: Herbivore.Size: Estimated around†‬15†‬meters long.Time Period: Late Campanian/Early Maastrichtian of
the Cretaceous.
Diet: Herbivore.Size: Roughly estimated to be about 25 meters long.
Refer to main text for more details.Time Period: Kimmeridgian to Tithonian of the
Jurassic.
Diet: Herbivore.Size: Uncertain due to lack of remains.Time Period: Turonian to Santonian of the Cretaceous.
Diet: Herbivore.Size: At least 6 meters long, maybe more.Time Period: Late Maastrichtian of the Cretaceous.
Diet: Herbivore.Size: About†‬2†‬meters long.Time Period: Cenomanian to Turonian of the
Cretaceous.
Diet: Herbivore.Size: Unknown.Time Period: Mid Jurassic.
Diet: Herbivore.Size: Skull about†‬90†‬centimetres long.†‬Total
size uncertain.Time Period: Campanian of the Cretaceous.
Diet: Carnivore/Insectivore.Size: Early specimens estimated at about†‬34â€
‬centimetres long. Additional specimens possibly up to 40 centimetres
long.Time Period: Oxfordian of the Jurassic.
Diet: Herbivore.Size: Individuals typically range between 2 and 4
meters in length, though some remains suggest even larger.Time Period: Pliensbachian to Toarcian of the
Jurassic.
Diet: Herbivore.Size: About 15 to 18 meters long.Time Period: Cenomanian of the Cretaceous.
Diet: Herbivore.Size: Humerus about 110 centimetres long, ulna about
69 centimetres long. Total size uncertain due to lack of remains.Time Period: Turonian of the Cretaceous.
Diet: Herbivore.Size: Unknown due to lack of fossils.Time Period: Campanian of the Cretaceous.
Diet: Herbivore.Size: Unknown due to lack of fossil remains.Time Period: Mid Jurassic.
Diet: Carnivore.Size: Roughly estimated to be about†‬2†‬and†‬3â€
‬meters long.Time Period: Cenomanian/Turonian of the Cretaceous.
Diet: Herbivore.Size: Skull about†‬25†‬centimetres long.†‬Body
length uncertain due to lack of remains,†‬but comparison to other
nodosaurs suggests up to about†‬3†‬meters for the total body length.Time Period: Albian/Cenomanian of the Cretaceous.
