Genus Apatosaurus, a giant sauropod dinosaur that lived approximately 150 years ago, has several synonyms in the scientific community. Some of the most commonly used synonyms for this genus include Brontosaurus and Elosaurus. While the genus itself is quite well-known, various species within the Apatosaurus genus have also been given alternative names. These include A. excelsus, A. parvus, and A. ajax. The existence of multiple synonyms for this genus is not uncommon in paleontology, as new discoveries and updated classifications can lead to changes in the scientific names given to different extinct species. Nonetheless, the various synonyms for Genus Apatosaurus continue to be used today in scientific and public discourse.