Nanuqsaurus

Nanuqsaurus ('meaning polar bear lizard') is a genus of  theropod dinosaur.Fiorillo A.R & Tykoski R.S. 2014. A diminutive new tyrannosaur from the top of the world. PLOS One.  It is only known from one specimen, DMNH 21461, a partial skull roof found in Alaska. This dinosaur may grown to about 6 m (~20 ft) long, half the size of Tyrannosaurus.

The skull would have been about 50 cm (1.65 ft) when complete.

 References 

Category:Tyrannosaurids