Temporal range: Upper Cretaceous, 80 mya
|Skeletal reconstruction of Lythronax (A) and Teratophoneus (B)|
Loewen et al 2013
Lythronax is an extinct genus of tyrannosaurid theropod dinosaur. It lived about 80 million years ago (mya) in what is now southern Utah. L. argestes is the oldest known tyrannosaurid based on its stratigraphic position.
The rostrum is comparatively short: it makes up less than two thirds of the total skull length. The whole skull is very broad, 0.4 times as wide as long. Overall, the skull is similar to that of Tyrannosaurus and Tarbosaurus. Its robust jaws have two sizes of teeth: its first five teeth are much larger than the other six. Behind the skull, the rest of the skeleton is similar to that of other tyrannosaurids.
References[change | change source]
- Loewen M.A. et al (2013). Tyrant dinosaur evolution tracks the rise and fall of late Cretaceous oceans. In Evans, David C. PLoS ONE 8 (11): e79420. 
- "T. rex gets a new relative: Lythronax argestes, gore king of the south". Walking with dinosaurs. David Hone. Retrieved 6 November 2013.
- front part of skull