Dinosaurs That Start With A

Dinosaurs are prehistoric creatures that roamed the Earth millions of years ago. They are classified as reptiles and lived from about 245 million years ago until around 66 million years ago when they went extinct. Dinosaurs are known for their long necks, sharp teeth, and massive sizes. These creatures were some of the largest to ever walk the Earth and captivate the imagination of people today.

Compiling this list of prehistorical wonders has been an exciting journey for me. From scouring through scientific journals to browsing dinosaur books, my efforts have been exhaustive, but fruitful. The result is a comprehensive list that highlights the diversity and enormity of these majestic beasts.

So, let’s begin exploring this list of dinosaurs starting with A!

143 Dinosaurs That Start With A

And here’s the list of dinosaurs that begin with A letter.

Aachenosaurus

This herbivorous dinosaur was around 6.5 meters long and weighed around a ton. It had a long neck with 13 vertebrae and is believed to have eaten leaves and flowers.

Aardonyx

Known for its long neck and slender legs, Aardonyx was an early plant-eating dinosaur. It is believed to have fed on plants near rivers and lakes, and its powerful legs helped it move quickly through the water.

Abdarainurus

This dinosaur was a bipedal herbivore that lived in the Late Cretaceous Period. Little is known about this dinosaur, but it is believed to have been around 6 meters long and had powerful jaws to grind up tough plants.

Abditosaurus

This dinosaur was a small herbivore that lived in the Early Cretaceous Period. It had long legs, a sharp beak and flat teeth to grind up vegetation. It is believed to have been around 2 meters long and weighed around 80 kilograms.

Abelisaurus

Abelisaurus was a large carnivorous dinosaur that lived around 80 million years ago. It had powerful jaws and sharp teeth that were used to tear apart prey. It is believed to have been around 8-9 meters long and weighed around 3 tons.

Abrictosaurus

This small, bipedal dinosaur was around 2 meters long and weighed around 75 kilograms. It had a long neck, powerful legs, and sharp teeth that were used to eat plants. It lived in the Late Jurassic Period.

Abrosaurus

This herbivorous dinosaur was around 10-12 meters long and weighed around 5 tons. It had long necks, and powerful, muscular legs that were used to support its massive weight. It lived in the Late Jurassic Period.

Abydosaurus

This dinosaur was around 27 feet long and weighed around 3-4 tons. It had a long neck and a small head, with flat teeth that were used to chew tough plants. It is believed to have lived in the Late Cretaceous Period.

Acantholipan

This large, plant-eating dinosaur is known for its unique spike-like projection on its hips. It was around 6 meters long and weighed around 2-3 tons. It lived in the Late Cretaceous Period.

Achelousaurus

Achelousaurus was a horned dinosaur that lived in the Late Cretaceous Period. It had a bony frill on its neck with horns protruding from it. It is believed to have been around 6-7 meters long and weighed around 2 tons.

Acheroraptor

This small, feathered dinosaur was around 3 feet tall and weighed around 15 kilograms. It had a long, slender snout and sharp teeth that were used to tear apart prey. It lived in the Late Cretaceous Period.

Achillesaurus

This small, fast-running, carnivorous dinosaur is believed to have lived in the Late Jurassic Period. It had long, slender legs and sharp teeth that were used to tear apart prey. It is believed to have been around 2 meters long.

Achillobator

This large, feathered dinosaur was around 6 meters long and weighed around 500 kilograms. It had sharp teeth and claws that were used to hunt prey. It lived in the Late Cretaceous Period.

Acristavus

This dinosaur was a small plant-eater that lived in the Late Cretaceous Period. It had a long neck and was around 2-3 meters long. Its name means “uncrowned ancestor,” because it lacks the signature head ornamentation of other ceratopsians.

Acrocanthosaurus

This large carnivorous dinosaur had long spines on its back that gave it its name. It was around 10-12 meters long and weighed around 5-6 tons. It lived in the Early Cretaceous Period.

Acrotholus

This small, bipedal dinosaur was around 1.5 meters long and weighed around 30-40 kilograms. It is believed to have been an early member of the ceratopsian family, but it had no horns or frills.

Actiosaurus

This dinosaur is known from a single vertebra and is believed to have been a small theropod. Not much is known about this dinosaur, but it is believed to have lived in the Late Jurassic Period.

Adamantisaurus

This dinosaur was around 20-25 meters long and weighed around 40-50 tons, making it one of the largest dinosaurs to have ever lived. It was a herbivore that fed on tough, fibrous plants. It lived in the Late Cretaceous Period.

Adasaurus

This small, bird-like dinosaur was around 2 meters long and weighed around 25 kilograms. It had long, sharp teeth and claws that were used to hunt small prey. It lived in the Late Cretaceous Period.

Adelolophus

This herbivorous dinosaur was around 5-6 meters long and weighed around 2-3 tons. It had a unique ridge on top of its skull, with flat teeth that were used to grind up vegetation. It lived in the Late Cretaceous Period.

Adratiklit

A small, bipedal dinosaur that lived during the Late Jurassic period over 156 million years ago.

Adynomosaurus

A genus of extinct sauropod dinosaur that lived during the Early Cretaceous period, about 125 million years ago.

Aegyptosaurus

A large plant-eating dinosaur that lived during the Late Cretaceous period in what is now Egypt.

Aepisaurus

A long-necked sauropod dinosaur that lived during the Late Jurassic period in what is now Argentina.

Aepyornithomimus

A small theropod dinosaur from the Late Cretaceous period of what is now Mongolia.

Aerosteon

A carnivorous dinosaur from the Late Cretaceous period of what is now Argentina.

Afromimus

A small ornithomimid dinosaur from the Late Cretaceous period of what is now Niger.

Afrovenator

A large predatory dinosaur from the Early Cretaceous period of what is now Niger.

Agathaumas

A large Cretaceous period herbivorous dinosaur that lived in what is now Wyoming.

Aggiosaurus

A genus of dinosaur that lived during the Middle Jurassic period in what is now Argentina.

Agilisaurus

A small herbivorous dinosaur from the Late Jurassic period of what is now China.

Agnosphitys

A small, herbivorous dinosaur known from Late Triassic fossils found in Scotland.

Agujaceratops

A small ceratopsian dinosaur from the Late Cretaceous period of what is now Texas.

Agustinia

A large, long-necked sauropod dinosaur from the Early Cretaceous period of what is now Argentina.

Ajancingenia

A genus of dinosaur from the Late Cretaceous period of what is now Argentina.

Ajkaceratops

A small ceratopsian dinosaur from the Late Cretaceous period of what is now Uzbekistan.

Ajnabia

A small theropod dinosaur from the Late Jurassic period of what is now Morocco.

Akainacephalus

A genus of ankylosaurid dinosaur from the Late Cretaceous period of what is now Utah.

Alamosaurus

A giant sauropod dinosaur from the Late Cretaceous period of what is now North America.

Alaskacephale

A small pachycephalosaurid dinosaur from the Late Cretaceous period of what is now Alaska.

Albalophosaurus

A small, bipedal theropod dinosaur from the Late Jurassic period of what is now China.

Albertadromeus

A small ornithischian dinosaur from the Late Cretaceous period of what is now Alberta, Canada.

Albertavenator

A genus of theropod dinosaur from the Late Cretaceous period of what is now Canada.

Albertonykus

A small theropod dinosaur from the Late Cretaceous period of what is now Alberta, Canada.

Albertosaurus

A large tyrannosaurid dinosaur from the Late Cretaceous period of what is now Alberta, Canada.

Albinykus

A small theropod dinosaur from the Late Cretaceous period of what is now Mongolia.

Albisaurus

A genus of primitive theropod dinosaur from the Late Triassic period of what is now Argentina.

Alcovasaurus

A small, herbivorous dinosaur from the Early Jurassic period of what is now Wyoming.

Alectrosaurus

A genus of tyrannosaurid dinosaur that lived during the Late Cretaceous period in what is now Mongolia.

Aletopelta

A genus of ankylosaurid dinosaur that lived during the Late Cretaceous period in what is now California, United States.

Algoasaurus

Long-necked dinosaur that lived during the early Cretaceous period.

Aliwalia

This dinosaur is known only from a single fossil discovered in Mongolia.

Allosaurus

One of the most well-known carnivorous dinosaurs of the Late Jurassic.

Almas

A theropod dinosaur that lived about 115 million years ago.

Alnashetri

A genus of herbivorous dinosaur from the Late Cretaceous period.

Alocodon

A dinosaur from the Early Cretaceous period that lived in what is now China.

Altirhinus

A herbivorous dinosaur that lived during the Early Cretaceous period.

Altispinax

A theropod dinosaur that lived during the Late Jurassic period.

Alvarezsaurus

A small, bipedal dinosaur with very short arms.

Alxasaurus

A genus of small theropod dinosaur that lived in what is now China during the Early Cretaceous period.

Amanasaurus

A dinosaur that lived during the middle Jurassic period in what is now Tanzania.

Amargasaurus

This dinosaur is known for its distinctive rows of spines along its back.

Amazonsaurus

A large sauropod dinosaur that roamed what is now Brazil during the Early Cretaceous.

Ambopteryx

A small, feathered dinosaur that lived during the Jurassic period.

Ammosaurus

A relatively small herbivorous dinosaur from the Late Jurassic period.

Ampelosaurus

A herbivorous dinosaur that lived during the Late Cretaceous period.

Amtocephale

A pachycephalosaur dinosaur that lived during the Late Cretaceous period.

Amurosaurus

A large, herbivorous dinosaur with a long tail and a bony crest on its skull.

Analong

A genus of ornithopod dinosaur that lived in what is now China during the Late Jurassic period.

Anasazisaurus

A herbivorous dinosaur that lived during the Late Cretaceous period.

Anatosaurus

A type of hadrosaurid dinosaur that lived during the Late Cretaceous period.

Anatotitan

A species of hadrosaurid dinosaur that lived during the Late Cretaceous period in what is now North America.

Anchisaurus

A small herbivorous dinosaur that lived during the Late Triassic period.

Andesaurus

A large, herbivorous dinosaur that lived during the Early Cretaceous period.

Angaturama

A theropod dinosaur that lived during the Early Cretaceous period.

Angolatitan

A large, long-necked dinosaur that lived during the Late Cretaceous period.

Angulomastacator

A theropod dinosaur that lived during the Late Jurassic period.

Anhuilong

A genus of small, feathered theropod dinosaur that lived during the Early Cretaceous period.

Aniksosaurus

A small, bipedal dinosaur that lived during the Late Cretaceous period.

Animantarx

A genus of ankylosaurid dinosaur that lived during the Late Cretaceous period in what is now North America.

Ankylosaurus

With a heavily armored body and a club-like tail, Ankylosaurus was a formidable herbivore of the late Cretaceous period.

Anoplosaurus

Anoplosaurus, a relatively small armored dinosaur, was a close relative of the more well-known Ankylosaurus.

Anserimimus

Anserimimus, a bird-like dinosaur from the late Cretaceous period, is named after the word for goose due to its long neck.

Antarctosaurus

Despite its name, Antarctosaurus was not found in Antarctica but in what is now South America during the Late Cretaceous.

Antetonitrus

As one of the earliest known sauropod dinosaurs, Antetonitrus provides important insight into the evolution of these massive herbivores.

Antrodemus

Formerly known as Allosaurus, Antrodemus was a large carnivorous dinosaur that lived during the late Jurassic period.

Anzu

With its strange, bird-like appearance, Anzu is often referred to as the “chicken from hell” by paleontologists.

Aoniraptor

Aoniraptor was a small, agile predator with sharp, serrated teeth for tearing into its prey.

Aorun

This small carnivorous dinosaur from the late Jurassic is notable for its unusual skull shape.

Apatoraptor

With a name that means “deceptive thief,” the Apatoraptor was a small but fierce carnivore.

Apatosaurus

Originally known as Brontosaurus, Apatosaurus is named for its massive size and long neck.

Appalachiosaurus

A large, carnivorous dinosaur from the early Cretaceous period, Appalachiosaurus is one of the few known predators from this time and place.

Aquilops

Aquilops, a small herbivorous dinosaur from the early Cretaceous, is known for its distinctive parrot-like beak.

Aragosaurus

Aragosaurus is a sauropod dinosaur from the Early Cretaceous, known for its unusually long neck.

Aralosaurus

With its unusual spike-like horns, Aralosaurus was a unique member of the hadrosaur family.

Archaeoceratops

Archaeoceratops was a small horned dinosaur, known for its distinct bony frill.

Archaeodontosaurus

Named for its distinctive teeth, Archaeodontosaurus was a small, bipedal dinosaur with sharp claws.

Archaeopteryx

Often referred to as the “first bird,” Archaeopteryx is a transitional fossil between dinosaurs and modern birds.

Archaeoraptor

Although once thought to be a missing link between dinosaurs and birds, Archaeoraptor is now known to be a fossil forgery.

Archaeornis

With its beaked face and sharp claws, the Archaeornis was a fierce predator of the late Cretaceous.

Archaeornithomimus

As a close relative of the more well-known Ornithomimus, Archaeornithomimus was a speedy, bird-like dinosaur.

Arcovenator

With its sharp teeth and powerful jaws, Arcovenator was one of the top predators of its ecosystem.

Arcusaurus

As a close relative of the more well-known Dilophosaurus, Arcusaurus was a two-legged predator with distinctive crests on its head.

Arenysaurus

This Spanish dinosaur was related to the more famous Iguanodon, but had a shorter, thicker snout.

Argentinosaurus

As one of the largest land animals to ever exist, this massive dinosaur would have weighed as much as 10 elephants.

Argyrosaurus

The remains of this long-necked herbivore were only discovered in 1993, making it a relatively new addition to the dinosaur family tree.

Aristosaurus

This dinosaur was named after the Greek word for “excellent lizard,” and while not much is known about it, it’s believed to have been a small, carnivorous theropod.

Aristosuchus

A close relative to the dinosaurs, this prehistoric creature roamed Madagascar with its distinctively long jaws filled with sharp teeth.

Arizonasaurus

This lightly built, bipedal dinosaur lived during the late Triassic period and is known for its elongated neck.

Arkansaurus

This one-ton, duck-billed dinosaur once called Arkansas home and likely roamed its swamps and riverbanks in search of food.

Arkharavia

Discovered in Russia, this carnivorous dinosaur is unique for its unusually long and slender hindlimbs.

Arrhinoceratops

This small, horned dinosaur gets its name from its unusual lack of a nasal horn.

Arstanosaurus

With a name that means “thunder lizard,” this massive dinosaur was among the largest animals to ever walk the earth.

Asfaltovenator

This carnivorous dinosaur lived in what is now Argentina during the early Jurassic period and is known for its sharp teeth and powerful jaws.

Asiaceratops

This small, frilled dinosaur would have used its distinctive headgear to protect itself from predators.

Asiamericana

Like its name suggests, this dinosaur lived on the supercontinent of Pangaea during the late Jurassic period.

Asiatosaurus

This heavily built herbivore had a small head and four broad legs, making it perfectly adapted for life on the ground.

Asilisaurus

Dating back to the early Jurassic period, this small, bipedal dinosaur is notable for its long fingers and toes.

Astrodon

This massive, long-necked dinosaur once roamed the eastern coast of what is now North America.

Astrodontaurus

This carnivorous dinosaur was known for its sharp teeth and powerful jaws, which it would have used to snap at its prey.

Astrophocaudia

Named for its unusual vertebrae, this dinosaur lived in what is now Australia during the early Cretaceous period.

Asylosaurus

This small, armored dinosaur would have used its tough exterior to protect itself from predators.

Atacamatitan

Discovered in Chile, this titanosaur was one of the largest land animals to ever exist.

Atlantosaurus

This large dinosaur lived during the late Jurassic period and is known for its massive tail and stout legs.

Atlasaurus

Named after its discovery in the Atlas Mountains of Morocco, this long-necked dinosaur would have weighed over 15 tons.

Atlascopcosaurus

This small, herbivorous dinosaur lived in what is now Australia during the early Cretaceous period.

Atrociraptor

This small, carnivorous dinosaur gets its name from the Latin word for “savage thief.”

Atsinganosaurus

Discovered in Mongolia, this small, bipedal dinosaur would have been a quick and agile runner.

Aublysodon

This small, carnivorous dinosaur had long, curved teeth that it would have used to tear flesh from its prey.

Aucasaurus

This medium-sized dinosaur was notable for its unusually long arms and three-fingered hands.

Augustynolophus

Named for the paleontologist who discovered it, this duck-billed dinosaur would have roamed the earth during the late Cretaceous period.

Auroraceratops

This small, horned dinosaur had a distinctive head crest and would have used it to attract mates.

Aurornis

This feathered dinosaur was one of the earliest known ancestors of modern birds.

Australodocus

A gentle giant herbivore from the land down under with its elongated neck and tail.

Australotitan

A massive, long-necked sauropod that once roamed across southern Australia.

Australovenator

One of Australia’s largest carnivorous dinosaurs with its deadly claws and sharp teeth.

Austroposeidon

A giant sauropod, possibly one of the largest dinosaurs to walk the earth.

Austrosaurus

A long-necked plant-eater found in South America during the Late Cretaceous period.

Avaceratops

A small, horned dinosaur with a beak-like mouth found in North America.

Avimimus

A bird-like dinosaur from Mongolia that likely used its long arms and sharp claws to catch prey.

Avipes

An extinct bird with long legs and feet adapted for perching on trees.

Avisaurus

A small bird-like creature from the Late Cretaceous period with razor-sharp teeth.

Azendohsaurus

An early reptile that lived during the Middle Triassic period and has been found in Madagascar.

Wrapping Up

And that’s our list of A dinosaurs.

I never thought putting together a list of dinosaurs would be so difficult. With hundreds of names to choose from, it was not an easy task. However, I was up for the challenge, and my research skills came in handy. Now, I have a list that covers the most well-known dinosaurs, and a few hidden gems that are lesser-known.

In conclusion, dinosaurs have undoubtedly left an indelible mark on our planet’s history. Their colossal size, unique physical characteristics, and diverse habitats are a testament to their impressive evolution over millions of years. Although they have been extinct for over 65 million years, their legacy lives on through fossils, scientific discoveries, and popular culture. As we continue to explore and learn more about these prehistoric creatures, we gain a deeper understanding of our evolutionary past and the complex ecosystems that existed millions of years ago. We must continue to preserve and protect these incredible fossils and the knowledge they provide for future generations to come.

Hope this post on dinosaur names beginning with A alphabet has been useful to you!