T. rex and the World of the Tyrannosaurs Wiki

Aublysodon (meaning Backwards-Flowing Tooth) is an extinct tyrannosaurine that lived from 79-65 MYA, existing for 14 million years. There are four known species, Aublysodon Amplus, Aublysodon Cristatus, Aublysodon Lateralis, and Aublyson Mirandus.