A better version of my tyrannosauroid cladogram made with TreeView, including a few more genera thrown in.
Now you may be wondering why I threw Nanotyrannus in there, if it’s pretty much thought to just be a juvenile T. rex. Well, Alioramus was thought to be a juvenile Tarbosaurus, but then A. altai proved that wrong, so it might just be the same situation.
If so, I propose that Nanotyrannus is a North American alioramid tyrannosauroid (“alioramid” is a term I made up for my so-called “Alioramidae” consisting of Alioramus, Xiongguanlong, and now possibly Nanotyrannus).
Alternatively, they might fall within Tyrannosauridae and thus be “Alioraminae” instead, all of them now being alioramine tyrannosaurids.
Again, this is just armchair paleontology and shouldn’t be taken too seriously, as it’s based solely off of at-face-value morphology and locations of the different genera. It makes sense to me, but evolution doesn’t always have to make sense.