This article is research, and new taxa made in the year of 1988 based on tyrannosaurs.
- Nanotyrannus-Nanotyrannus is one of the many tyrannosaurids known in North America. It wasn't that large growing 20 ft in length. Some believe that it could be the same as Tyrannosaurus.
- Tyrannosaurus torosus-now known as Daspletosaurus
- ''Nanotyrannes''-now known as Nanotyrannus
- Stygivenator molnari-now classified as Tyrannosaurus rex
- Albertosaurus megagracilis-now classified as Tyrannosaurus rex