Astrodon is a type of large dinosaur that lived about 112 million years ago during the Early Cretaceous period. This dinosaur was a herbivore, meaning it ate plants. Astrodon was quite big, measuring around 66 feet long and about 30 feet tall. Its fossils have been found mainly in what is now the eastern United …

Astigmasaura is an extinct group of dinosaurs that lived during the Late Cretaceous period in what is now Argentina. This dinosaur belongs to a family called Rebbachisauridae, which are known for their long necks and large bodies. The only known species of Astigmasaura is called Astigmasaura genuflexa. Scientists discovered its remains, which include parts of …

**Asilisaurus: An Ancient Reptile** Asilisaurus is an extinct group of reptiles that lived during the middle Triassic period, about 247 to 242 million years ago. It was discovered from fossils found in Tanzania. The name Asilisaurus comes from the Swahili word “asili,” meaning “ancestor,” and the Greek word “sauros,” meaning “lizard.” **Where It Was Found** …

Asiatyrannus Asiatyrannus is an extinct type of dinosaur that lived during the Late Cretaceous period, about 66.7 million years ago. It is a member of the tyrannosaur family and is mostly found in the southern regions of Asia, particularly in the Nanxiong Formation of China. The name “Asiatyrannus” means “Asian tyrant.” There is one species …

Asiatosaurus, which means “Asian lizard,” is a group of dinosaurs that lived a long time ago during the Early Cretaceous period, around 122 to 112 million years ago. These dinosaurs were herbivores, which means they ate plants. They were found in what is now Mongolia and China. The main species of Asiatosaurus is known as …

Asiamericana is a type of dinosaur that lived during the Late Cretaceous period, around 90 million years ago. This dinosaur is special because it is known only from a few teeth that were discovered in Uzbekistan. The name Asiamericana was chosen because these teeth resemble those found in both Central Asia and North America. This …

Asiaceratops is an extinct genus of dinosaurs known as ceratopsians, meaning “horned faces.” These fascinating creatures roamed the Earth during the Cretaceous Period, specifically from about 125 to 99 million years ago. The name “Asiaceratops” combines “Asia” with “ceratops,” which means “horned face” in Greek. The type species, called Asiaceratops salsopaludalis, was initially described in …

**Asfaltovenator: The Hunter of Cañadón Asfalto** Asfaltovenator is an extinct genus of theropod dinosaur that lived during the lower Jurassic period, specifically between 179 to 178 million years ago. Its name means “Cañadón Asfalto Formation hunter,” named after the geological formation in Argentina where its fossils were discovered. **Discovery of Asfaltovenator** In 2002, a technician …

Arstanosaurus is a type of dinosaur that lived during the Late Cretaceous period, around 85 to 84 million years ago. Its name means “Arstan lizard,” named after a well called Arstan in Kazakhstan. Arstanosaurus is part of a larger family of dinosaurs known as hadrosaurids, also called “duck-billed dinosaurs.” These dinosaurs were mostly found in …

Arrudatitan is an extinct type of dinosaur that belongs to a group called titanosaurs. These dinosaurs lived during the Late Cretaceous period, around 72.1 to 68 million years ago, in what is now Brazil. The name Arrudatitan means “Arruda’s giant,” and the specific type of Arrudatitan, known as A. maximus, was named in 2011. At …