The history of Apatosaurus is confusing. The first skeleton, found in the 1870’s to be found lacked a skull. Although some bones of its skeleton looked a lot like Diplodocus, which lived at the same time, other bones looked more like another dinosaur called Camarosaurus’ . This made it difficult to figure out exactly where Apatosaurus fit in with other dinosaurs. We now know that the skull of Apatosaurus looked more like Diplodocus than Camarosaurus’ , so we able to put Apatosaurus and Diplodocus in the same family. Problem solved. Another confusion surrounding Apatosaurus is that we at one time thought that Apatosaurus and Brontosaurus, another dinosaur that lived at the same time, were the same dinosaur that had been accidentally given two names. In 2015, a new study showed that although Apatosaurus and Brontosaurus are very similar, they are actually two different dinosaurs.