A #FossilFriday question: Whatever happened to Brontosaurus? The name for this sauropod dinosaur has stuck around, but since 1903, Brontosaurus has been regarded as the "junior synonym" of Apatosaurus. And research published in 2015 reopened the door to potentially recognize Brontosaurus as a separate animal. Take a look with Bill Simpson, collections manager of fossil vertebrates & head of geological collections, at how Brontosaurus came to be called Apatosaurus: | Field Museum