Atlantosaurus is a prehistoric dinosaur that lived during the Late Jurassic period, approximately 150 million years ago. It was a massive, herbivorous quadrupedal sauropod that inhabited the North American continent. The name 'atlantosaurus' is derived from the Latin word 'Atlas,' meaning great or mighty and 'saurus,' meaning lizard. However, there are several synonyms for the genus Atlantosaurus, including Apatosaurus, Brontosaurus, and Elosaurus. These synonyms have been used due to several morphological similarities between the dinosaurs. Despite being synonymous, these dinosaurs differ in size, skeletal structure, and other anatomical features.