Arrhinoceratops This ceratopsian was named for its "missing" nose horn.

Astrodon The official state dinosaur of Maryland.

Atlasaurus This sauropod had unusually long legs.

Atlascopcosaurus Named after a manufacturer of digging equipment.

Atrociraptor This "cruel thief" wasn't as atrocious as its name implies.

Aublysodon This tyrannosaur was named after a single tooth.

Aucasaurus This predator was a close relative of Carnotaurus.