List of Dinosaurs Beginning with A

As it stands, there are over 700 known species of dinosaur, but the actual number is likely much, much higher. With each new discovery that palaeontologists make (scientists who study fossils and dinosaurs), more is revealed about these amazing creatures.

This posts lists the majority of known dinosaur species beginning with the letter A. Some of the most recognisable dinosaurs in this post include the Allosaurus, Apatosaurus (formerly known as Brontosaurus) and the Alamosaurus.

Read on to learn more about the 66 known dinosaurs that begin with the letter A!

Aardonyx

Aardonyx, meaning Greek for “earth claw”, was pronounced ARD-oh-nix. It was a Herbivore that was found in the Woodlands of southern Africa during the Early Jurassic period, around 195 million years ago. It was 20 feet long and weighed around 1,000 pounds, and it’s notable characteristics were: Long neck and tail; long, low-slung body.

Abelisaurus

Abelisaurus, meaning Greek for “Abel’s lizard”, was pronounced AY-bell-ih-SORE-us. It was a Carnivore that was found in the Woodlands of South America during the Late Cretaceous period, around 85-80 million years ago. It was 30 feet long and weighed around 2 tons, and it’s notable characteristics were: Large head with small teeth; openings in skull above jaws.

Abrictosaurus

Abrictosaurus, meaning Greek for “waking lizard”, was pronounced AH-brick-toe-SORE-us. It was a Herbivore that was found in the Woodlands of southern Africa during the Early Jurassic period, around 200 million years ago. It was four feet long and weighed around 100 pounds, and it’s notable characteristics were: Small size; a combination of beak and teeth.

Abrosaurus

Abrosaurus
An Abrosaurus.

Abrosaurus, meaning Greek for “delicate lizard”, was pronounced AB-roe-SORE-us. It was a Herbivore that was found in the Woodlands of Asia during the Middle Jurassic period, around 165-160 million years ago. It was 30 feet long and weighed around five tons, and it’s notable characteristics were: Moderate size; short, boxy skull.

Abydosaurus

Abydosaurus, meaning Greek for “Abydos lizard”, was pronounced ah-BUY-doe-SORE-us. It was a Herbivore that was found in the Woodlands of North America during the Middle Cretaceous period, around 105 million years ago. It was 50 feet long and weighed around 10-20 tons, and it’s notable characteristics were: Large size; long neck and tail.

Acanthopholis

Acanthopholis, meaning Greek for “spiny scales”, was pronounced ah-can-THOFF-oh-liss. It was a Herbivore that was found in the Woodlands of western Europe during the Middle Cretaceous period, around 110-100 million years ago. It was 13 feet long and weighed around 800 pounds, and it’s notable characteristics were: Thick, oval-shaped armor; pointed beak.

Achelousaurus

Achelousaurus, meaning Greek for “Achelous lizard”, was pronounced AH-kell-oo-SORE-us. It was a Herbivore that was found in the Woodlands of North America during the Late Cretaceous period, around 80-65 million years ago. It was 20 feet long and weighed around one ton, and it’s notable characteristics were: Medium size; large frill; bony knobs above eyes.

Achillobator

Achillobator, meaning combination Greek/Mongolian for “Achilles warrior, was pronounced ah-KILL-oh-bate-ore. It was a Carnivore that was found in the Plains of Central Asia during the Late Cretaceous period, around 95-85 million years ago. It was 20 feet long and weighed around 500 to 1,000 pounds, and it’s notable characteristics were: Large size; huge claws on feet; odd alignment of hips.

Adamantisaurus

Adamantisaurus
Adamantisaurus.

Adamantisaurus, meaning Greek for “Adamantina lizard”, was pronounced ADD-ah-MANT-ih-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Late Cretaceous period, around 75-65 million years ago. It was Up to 100 feet long and weighed around 100 tons, and it’s notable characteristics were: Large size; long neck and tail; probably armor.

Adasaurus

Adasaurus, meaning Greek for “Ada lizard”, was pronounced AY-dah-SORE-us. It was a Carnivore that was found in the Woodlands of central Asia during the Late Cretaceous period, around 75-65 million years ago. It was 5 feet long and weighed around 50-75 pounds, and it’s notable characteristics were: Tall skull; short claws on hind feet; probable feathers.

Adeopapposaurus

Adeopapposaurus, meaning Greek for “far-eating lizard”, was pronounced AD-ee-oh-PAP-oh-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Early Jurassic period, around 200 million years ago. It was 10 feet long and weighed around 150 pounds, and it’s notable characteristics were: Long neck and tail; horny beak.

Aegyptosaurus

Aegyptosaurus, meaning Greek for “Egyptian lizard”, was pronounced ay-JIP-toe-SORE-us. It was a Herbivore that was found in the Woodlands of northern Africa during the Middle Cretaceous period, around 100-95 million years ago. It was 50 feet long and weighed around 12 tons, and it’s notable characteristics were: Long neck and tail; relatively long legs.

Aeolosaurus

Aeolosaurus, meaning Greek for “Aeolus lizard”, was pronounced AY-oh-low-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Late Cretaceous period, around 75-65 million years ago. It was 50 feet long and weighed around 10-15 tons, and it’s notable characteristics were: Large size; forward-pointing spines on tailbones.

Agilisaurus

Agilisaurus, meaning Greek for “agile lizard”, was pronounced AH-jih-lih-SORE-us. It was a Herbivore that was found in the Woodlands of eastern Asia during the Middle Jurassic period, around 170-160 million years ago. It was four feet long and weighed around 75-100 pounds, and it’s notable characteristics were: Small size; lightweight build; stiff tail.

Agujaceratops

Agujaceratops, meaning Greek for “Aguja horned face”, was pronounced ah-GOO-hah-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of southern North America during the Late Cretaceous period, around 77 million years ago. It was 15 feet long and weighed around 2 tons, and it’s notable characteristics were: Large, two-lobed frill; horns over eyes.

Agustinia

Augstinia
Agustinia, named after paleontologist Agustin Martinelli.

Agustinia, meaning after paleontologist Agustin Martinelli, was pronounced ah-gus-TIN-ee-ah. It was a Herbivore that was found in the Woodlands of South America during the Early-Middle Cretaceous period, around 115-100 million years ago. It was 50 feet long and weighed around 10-20 tons, and it’s notable characteristics were: Large size; spines jutting out from vertebrae.

Ajkaceratops

Ajkaceratops, meaning Greek for “Ajka horned face”, was pronounced EYE-kah-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of central Europe during the Late Cretaceous period, around 85 million years ago. It was 3 feet long and weighed around 30-40 pounds, and it’s notable characteristics were: Small size; short frill.

Albalophosaurus

Albalophosaurus, meaning Greek for “white-crested lizard”, was pronounced AL-bah-LOW-foe-SORE-us. It was a Herbivore that was found in the Woodlands of eastern Asia during the Early Cretaceous period, around 140-130 million years ago. It was Undisclosed and weighed around N//A, and it’s notable characteristics were: Small size; bipedal posture; thickened skull.

Albertaceratops

Albertaceratops, meaning Greek for “Alberta horned face”, was pronounced al-BERT-ah-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of North America during the Late Cretaceous period, around 80-75 million years ago. It was 10 feet long and weighed around 2-3 tons, and it’s notable characteristics were: Long brow horns; Centrosaurus-like skull.

Albertadromeus

Albertadromeus, meaning Greek for “Alberta runner”, was pronounced al-BERT-ah-DRO-may-us. It was a Herbivore that was found in the Plains of North America during the Late Cretaceous period, around 80-75 million years ago. It was five feet long and weighed around 25-30 pounds, and it’s notable characteristics were: Small size; long hind legs.

Albertonykus

Albertonykus, meaning Greek for “Alberta claw”, was pronounced al-BERT-oh-NYE-cuss. It was a Insects that was found in the Woodlands of North America during the Late Cretaceous period, around 70 million years ago. It was 2 1/2 feet long and weighed around a few pounds, and it’s notable characteristics were: Small size; claws on hands; probably feathers.

Aletopelta

Aletopelta, meaning Greek for “wandering shield”, was pronounced ah-LEE-toe-PELL-ta. It was a Herbivore that was found in the Woodlands of southern North America during the Late Cretaceous period, around 80-70 million years ago. It was 20 feet long and weighed around one ton, and it’s notable characteristics were: Low-slung body; spikes on shoulders; clubbed tail.

Alioramus

Alioramus, meaning Greek for “different branch”, was pronounced AH-lee-oh-RAY-muss. It was a Carnivore that was found in the Woodlands of Asia during the Late Cretaceous period, around 70-65 million years ago. It was 20 feet long and weighed around 500-1,000 pounds, and it’s notable characteristics were: Moderate size; numerous teeth; bony crests on snout.

Altirhinus

Altirhinus, meaning Greek for “high nose”, was pronounced AL-tih-RYE-nuss. It was a Herbivore that was found in the Woodlands of Central Asia during the Middle Cretaceous period, around 125-100 million years ago. It was 26 feet long and weighed around 2-3 tons, and it’s notable characteristics were: Long, stiff tail; strange crest on the snout.

Alvarezsaurus

Alvarezsaurus
Alvarezsaurus, via Wikipedia.

Alvarezsaurus, meaning Greek for “Alvarez’s lizard”, was pronounced al-vah-rez-SORE-us. It was a Probably insects that was found in the Woodlands of South America during the Late Cretaceous period, around 85 million years ago. It was 6 feet long and weighed around 30-40 pounds, and it’s notable characteristics were: Long legs and tail; probably feathers.

Alwalkeria

Alwalkeria, meaning after the paleontologist Alick Walker, was pronounced AL-walk-EAR-ee-ah. It was a Uncertain; possibly omnivorous that was found in the Woodlands of southern Asia during the Late Triassic period, around 220 million years ago. It was Undisclosed and weighed around N//A, and it’s notable characteristics were: Bipedal posture; small size.

Alxasaurus

Alxasaurus, meaning Greek for “Alxa desert lizard”, was pronounced ALK-sah-SORE-us. It was a Herbivore that was found in the Woodlands of Central Asia during the Middle Cretaceous period, around 110-100 million years ago. It was 12 feet long and weighed around a few hundred pounds, and it’s notable characteristics were: Big gut; narrow head and neck; large claws on front hands.

Amargasaurus

Amargasaurus, meaning Greek for “La Amarga lizard:, was pronounced ah-MAR-gah-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Early Cretaceous period, around 130 million years ago. It was 30 feet long and weighed around three tons, and it’s notable characteristics were: Relatively small size; prominent spines lining neck and back.

Amazonsaurus

Amazonsaurus, meaning Greek for “Amazon lizard”, was pronounced AM-ah-zon-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Early Cretaceous period, around 125-100 million years ago. It was 40 feet long and weighed around five tons, and it’s notable characteristics were: Moderate size; long neck and tail.

Ampelosaurus

Ampelosaurus, meaning Greek for “vineyard lizard”, was pronounced AMP-ell-oh-SORE-us. It was a Herbivore that was found in the Woodlands of Europe during the Late Cretaceous period, around 70-65 million years ago. It was 50 feet long and weighed around 15-20 tons, and it’s notable characteristics were: Spiky armor on back, neck, and tail.

Amphicoelias

Amphicoelias, meaning Greek for “double hollow”, was pronounced AM-fih-SEAL-ee-us. It was a Herbivore that was found in the Woodlands of North America during the Late Jurassic period, around 150 million years ago. It was Up to 200 feet long and weighed around 125 tons, but more likely 80 feet long and 50 tons, and it’s notable characteristics were: Enormous size; quadrupedal posture; long neck and tail.

Amurosaurus

Amurosaurus
Amurosaurus.

Amurosaurus, meaning Greek for “Amur River lizard”, was pronounced AM-ore-oh-SORE-us. It was a Herbivore that was found in the Woodlands of Asia during the Late Cretaceous period, around 75-65 million years ago. It was 25 feet long and weighed around 2 tons, and it’s notable characteristics were: Large size; narrow snout; small crest on head.

Anabisetia

Anabisetia, meaning after the archaeologist Ana Biset, was pronounced AH-an-biss-ET-ee-ah. It was a Herbivore that was found in the Woodlands of South America during the Late Cretaceous period, around 95 million years ago. It was 6-7 feet long and weighed around 40-50 pounds, and it’s notable characteristics were: Small size; bipedal posture.

Anatotitan

Anatotitan, meaning Greek for “giant duck”, was pronounced ah-NAH-toe-TIE-tan. It was a Herbivore that was found in the Woodlands of North America during the Late Cretaceous period, around 65 to 70 million years ago. It was 40 feet long and weighed around 5 tons, and it’s notable characteristics were: Large size; broad, flat bill.

Anchiceratops

Anchiceratops, meaning Greek for “near the horned face”, was pronounced ANN-chi-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of North America during the Late Cretaceous period, around 70 million years ago. It was 12 feet long and weighed around 1-2 tons, and it’s notable characteristics were: Moderate size; paired brow horns; notched frill.

Anchiornis

Anchiornis, meaning Greek for “almost bird”, was pronounced ANN-kee-OR-niss. It was a Probably insects that was found in the Woodlands of Asia during the Late Jurassic period, around 155 million years ago. It was one foot long and weighed around a few ounces, and it’s notable characteristics were: Small size; feathers on front and back limbs.

Anchisaurus

Anchisaurus, meaning Greek for “near lizard”, was pronounced ANN-kih-SORE-us. It was a Herbivore that was found in the Woodlands of eastern North America during the Early Jurassic period, around 190 million years ago. It was six feet long and weighed around 75 pounds, and it’s notable characteristics were: Long, slim body; ridged teeth for shredding leaves.

Andesaurus

Andesaurus
Andesaurus.

Andesaurus, meaning Greek for “Andes lizard”, was pronounced AHN-day-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Middle Cretaceous period, around 100-95 million years ago. It was 130 feet long and weighed around unknown, and it’s notable characteristics were: Long neck and tail; relatively long legs.

Angolatitan

Angolatitan, meaning Greek for “Angola giant”, was pronounced ang-OH-la-tie-tan. It was a Herbivore that was found in the Deserts of Africa during the Late Cretaceous period, around 90 million years ago. It was Unknown and weighed around N//A, and it’s notable characteristics were: Long neck and tail; probably light armor.

Angulomastacator

Angulomastacator, meaning Greek for “bent chewer”, was pronounced ANG-you-low-MASS-tah-kay-tore. It was a Herbivore that was found in the Woodlands of North America during the Late Cretaceous period, around 80-70 million years ago. It was 25-30 feet long and weighed around 1-2 tons, and it’s notable characteristics were: Narrow snout; oddly shaped upper jaw.

Animantarx

Animantarx, meaning Greek for “living fortress”, was pronounced AN-ih-MAN-tarks. It was a Herbivore that was found in the Woodlands of North America during the Middle-Late Cretaceous period, around 100-90 million years ago. It was 10 feet long and weighed around 1,000 pounds, and it’s notable characteristics were: Low-slung posture; horns and spikes along back.

Anodontosaurus

Anodontosaurus, meaning Greek for “toothless lizard”, was pronounced ANN-oh-DON-toe-SORE-us. It was a Herbivore that was found in the Woodlands of North America during the Late Jurassic period, around 75-65 million years ago. It was 20 feet long and weighed around two tons, and it’s notable characteristics were: Squat torso; heavy armor; large tail club.

Antarctopelta

Antarctopelta, meaning Greek for “Antarctic shield”, was pronounced ant-ARK-toe-PELL-tah. It was a Herbivore that was found in the Woodlands of Antarctica during the Middle Cretaceous period, around 100-95 million years ago. It was 13 feet long and weighed around unknown, and it’s notable characteristics were: Squat, armored body; large teeth.

Antarctosaurus

Antarctosaurus, meaning Greek for “southern lizard”, was pronounced ann-TARK-toe-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Late Cretaceous period, around 80-65 million years ago. It was 60 feet to 100 feet long and weighed around 50 to 100 tons, and it’s notable characteristics were: Square, blunt head with peg-shaped teeth.

Antetonitrus

Antetonitrus, meaning Greek for “before the thunder”, was pronounced AN-tay-tone-EYE-truss. It was a Herbivore that was found in the Woodlands of Africa during the Late Triassic period, around 215-205 million years ago. It was 30 feet long and weighed around two tons, and it’s notable characteristics were: Long neck; thick trunk; grasping toes on feet.

Anzu

Anzu, via DK Find Out

Anzu, meaning after a demon in Mesopotamian mythology, was pronounced AHN-zoo. It was a Probably omnivorous that was found in the Plains of North America during the Late Cretaceous period, around 70-65 million years ago. It was 11 feet long and weighed around 500 pounds, and it’s notable characteristics were: Bipedal posture; feathers; crest on head.

Aorun

Aorun, meaning after a Chinese deity, was pronounced AY-oh-run. It was a Small lizards and mammals that was found in the Woodlands of Asia during the Late Jurassic period, around 160 million years ago. It was two feet long and weighed around a few pounds, and it’s notable characteristics were: Small size; slender build.

Aquilops

Aquilops, meaning Greek for “eagle face”, was pronounced ACK-will-ops. It was a Herbivore that was found in the Woodlands of North America during the Middle Cretaceous period, around 110-105 million years ago. It was two feet long and weighed around 3-5 pounds, and it’s notable characteristics were: Small size; beaked snout.

Aragosaurus

Aragosaurus, meaning Greek for “Aragon lizard”, was pronounced AH-rah-go-SORE-us. It was a Herbivore that was found in the Woodlands of western Europe during the Early Cretaceous period, around 140-120 million years ago. It was 60 feet long and weighed around 20-25 tons, and it’s notable characteristics were: Short head; longer hind than front limbs.

Aralosaurus

Aralosaurus, meaning Greek for “Aral Sea lizard”, was pronounced AH-rah-lo-SORE-us. It was a Herbivore that was found in the Woodlands of Central Asia during the Late Cretaceous period, around 95-85 million years ago. It was 25 feet long and weighed around 3-4 tons, and it’s notable characteristics were: Large size; prominent hump on the snout.

Archaeoceratops

Archaeoceratops, meaning Greek for “ancient horned face”, was pronounced AR-kay-oh-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of Asia during the Early Cretaceous period, around 125-115 million years ago. It was 2-3 feet long and weighed around 5-10 pounds, and it’s notable characteristics were: Small size; relatively large head with small frill.

Arcusaurus

Arcusaurus, meaning Greek for “rainbow lizard”, was pronounced ARE-koo-SORE-us. It was a Herbivore that was found in the Woodlands of southern Africa during the Early Jurassic period, around 200-190 million years ago. It was Undisclosed and weighed around N//A, and it’s notable characteristics were: Long neck; occasional bipedal posture.

Argyrosaurus

Argyrosaurus
Argyrosaurus

Argyrosaurus, meaning Greek for “silver lizard”, was pronounced ARE-guy-roe-SORE-us. It was a Herbivore that was found in the Woodlands of South America during the Late Cretaceous period, around 80 million years ago. It was 50-60 feet long and weighed around 10-15 tons, and it’s notable characteristics were: Large size; long neck and tail.

Aristosuchus

Aristosuchus, meaning Greek for “noble crocodile”, was pronounced AH-riss-toe-SOO-kuss. It was a Carnivore that was found in the Woodlands of western Europe during the Early Cretaceous period, around 125 million years ago. It was six feet long and weighed around 50 pounds, and it’s notable characteristics were: Small size; bipedal posture.

Arrhinoceratops

Arrhinoceratops, meaning Greek for “no-nose horned face”, was pronounced AY-rye-no-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of North America during the Late Cretaceous period, around 70-65 million years ago. It was 20 feet long and weighed around 2-3 tons, and it’s notable characteristics were: Large frill; two long horns over eyes.

Astrodon

Astrodon, meaning Greek for “star tooth”, was pronounced AS-tro-don. It was a Herbivore that was found in the Woodlands of eastern North America during the Early-Middle Cretaceous period, around 120-110 million years ago. It was 50 feet long and weighed around 20 tons, and it’s notable characteristics were: Large size; similarity to Brachiosaurus.

Asylosaurus

Asylosaurus, meaning Greek for “unharmed lizard”, was pronounced ah-SIE-low-SORE-us. It was a Unknown; possibly omnivorous that was found in the Woodlands of western Europe during the Late Triassic period, around 210-200 million years ago. It was Undisclosed and weighed around N//A, and it’s notable characteristics were: Slender build; bipedal posture.

Atlasaurus

Atlasaurus, via Wikipedia

Atlasaurus, meaning Greek for “Atlas lizard”, was pronounced AT-lah-SORE-us. It was a Herbivore that was found in the Woodlands of Africa during the Middle Jurassic period, around 165 million years ago. It was 50 feet long and weighed around 10-15 tons, and it’s notable characteristics were: Large size; relatively long legs.

Atlascopcosaurus

Atlascopcosaurus, meaning Greek for “Atlas Copco lizard”, was pronounced AT-lass-COP-coe-SORE-us. It was a Herbivore that was found in the Woodlands of Australia during the Early-Middle Cretaceous period, around 120-100 million years ago. It was 10 feet long and weighed around 300 pounds, and it’s notable characteristics were: Small size; long, stiff tail.

Atrociraptor

Atrociraptor, meaning Greek for “cruel thief”, was pronounced ah-TROSS-ih-rap-tore. It was a Carnivore that was found in the Woodlands of North America during the Late Cretaceous period, around 70 million years ago. It was three feet long and weighed around 20 pounds, and it’s notable characteristics were: Small size; short snout with backward-curving teeth.

Auroraceratops

Auroraceratops, meaning Greek for “dawn horned face”, was pronounced ore-ORE-ah-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of Asia during the Early Cretaceous period, around 125-115 million years ago. It was 20 feet long and weighed around 1,000-2,000 pounds, and it’s notable characteristics were: Short, wrinkled head; flat snout.

Australodocus

Australodocus, meaning Greek for “southern beam”, was pronounced AW-stra-la-DOE-kuss. It was a Herbivore that was found in the Woodlands of Africa during the Late Jurassic period, around 150 million years ago. It was 50 feet long and weighed around 10 tons, and it’s notable characteristics were: Large size; extremely long neck and tail.

Austroraptor

Austroraptor, meaning Greek for “southern thief”, was pronounced AW-stroh-rap-tore. It was a Carnivore that was found in the Woodlands of South America during the Late Cretaceous period, around 70 million years ago. It was 16 feet long and weighed around 500 pounds, and it’s notable characteristics were: Large size; narrow snout; short arms.

Austrosaurus

Austrosaurus, meaning Greek for “southern lizard”, was pronounced AW-stro-SORE-us. It was a Herbivore that was found in the Woodlands of Australia during the Early Cretaceous period, around 110-100 million years ago. It was 50-60 feet long and weighed around 15-20 tons, and it’s notable characteristics were: Large size; long neck and tail.

Avaceratops

Avaceratops, meaning Greek for “Ava’s horned face”, was pronounced AY-vah-SEH-rah-tops. It was a Herbivore that was found in the Woodlands of North America during the Late Cretaceous period, around 80-70 million years ago. It was 13 feet long and weighed around one ton, and it’s notable characteristics were: Short, thick frill; large head with powerful jaws.

Avimimus

Avimimus, meaning Greek for “bird mimic”, was pronounced AV-ih-MIME-us. It was a Carnivore and insects that was found in the Plains of central Asia during the Late Cretaceous period, around 75-70 million years ago. It was five feet long and weighed around 25 pounds, and it’s notable characteristics were: Bird-like wings; teeth in upper jaw.