Brontosaurus, thunder lizard, is an excellent name for a dinosaur, but fossils can have surprisingly fluid names. Lots of fossils have been named, but sometimes from incomplete skeletons, so the same species gets two names. When this happens the first name gets priority, so when the Brontosaurus was found to be the same as Apatosaurus, one of the names had to go and Apatosaurus came first.
Now Ars Technica reports that the Brontosaurus might be back, with a fractionally different look — thanks to new research published in PeerJ.