From a site in New Mexico, researchers have uncovered two skeletons of a previously unknown tyrannosauroid species. In Nature Ecology and Evolution yesterday (May 6), the authors report that this species fills an important gap between the smallest and largest tyrannosauroid species. The skeletons were from juvenile individuals with skulls measuring between 25 and 32 cm in length.
S.J. Nesbitt et al., “A mid-Cretaceous tyrannosauroid and the origin of North American end-Cretaceous dinosaur assemblages,” Nat Ecol Evol, doi:10.1038/s41559-019-0888-0, 2019.