Biogeographic distribution range of Tyrannosaurus and Tarbosaurus

[Vladimír Socha]

Good day to all listmembers!

I was curious if Tarbosaurus bataar has truly the largest range of currently documented tyrannosaurid, as Raun et al. (2026) claims? IIRC, the genus Tyrannosaurus has probably even larger biogeographic range, as it is currently known from many North American localities ranging from southern parts of Canada (Alberta and Saskatchewan) to Texas and New Mexico (or even Mexico)? Thank you for clarification, VS.

Raun, G. S.; et al. (2026). Taxonomic reassessment of juvenile tyrannosaurine specimens from Asia reveal large biogeographic ranges in tyrannosaurids. Cretaceous Research. 186: 106412.

[Wade Thompson]

If I remember correctly, T. rexes biogeographic range was likely at the very least similar in size to Tarbosauruses biogeographic range. For example, There are Tyrannosaurid fossils from the Ojo Alamo formation that might belong to T. rex or at least something similar to T. rex. An example of a possible T. rex specimen from the Ojo Alamo formation is SMP VP-2105. 

[Jura]

I would be skeptical of any discussions of range distribution in animals that may very well represent a species complex. I suspect that Greg Paul will be chiming in soon regarding this for T. rex. I suspect that we probably have something similar with Tarbosaurus. Extinct species are hard to parse out.