The size of Zhuchengtyrannus Magnus

The second tyrannosaur to be considered "the asian equivelant of Tyrannosaurus rex", Zhuchengtyrannus is a large bodied tyrannosaur that preceded Tarbosaurus.

And indeed, Zhuchengtyrannus is one of the largest in the tyrannosaur family, but how big was it exactly?

Let's take a look, shall we?

The theropod Database has this to say on Z. Magnus:

"Campanian, Late Cretaceous
Upper Xingezhuang Formation, Wangshi Series, Shandong, China
Holotype- (ZCDM V0031) (~12 m; adult) maxilla (640 mm), dentary (760 mm)
Diagnosis- (after Hone et al., 2011) horizontal shelf on lateral surface of the base of the ascending process; rounded notch in the anterior margin of the maxillary fenestra.
Reference- Hone, Wang, Sullivan, Zhao, Chen, Li, Ji, Ji and Xu, 2011. A new, large tyrannosaurine theropod from the Upper Cretaceous of China. Cretaceous Research. 32(4), 495-503"

12 meters has always seemed big to me, so let's take a more in depth look at the material.

The holotype for Zhuchengtyrannus (ZCDM V0031) consisted of a maxilla 64 cm(2.1 feet) in length and a partial dentary 76 cm(2.4 feet) in length.

The closest relative that we can really base any scaling, or even get an overall size estimation basis for is Tyrannosaurus Rex. We can also use Tarbosaurus, and i will here, but mind you i'm weary of doing so.

Sue has a 86.1 cm maxilla and 101 cm long Dentary, which suggests at an overall size of under 9 meters for Zhuchengtyrannus.

but having said that, the maxilla and dentary are similar in size to the 11.8 meter T. rex specimen AMNH 5027 and the 11.9 meter CM 9380. I think we've seen this time and time again where the size discrepancies in the corresponding bones in tyrannosaur(and Tyrannosaurus individuals in particular) are suprisingly large.

The corresponding bones in the holotype for Tarbosaurus measure 68 cm and 85 cm respectively.

So, by scaling off of those proportions found in the large bodied tyrannosaurs, A complete skull would measure ~127cm(4.16 feet) And, this is where it gets a little easier.

The holotype for tarbosaurus has had estimations that put it at roughly 11 meters long, and had a skull 4.2 feet long. These two tyrannosaurs are remarkably similar in overall skull morphology, alhtough Zhuchengtyrannus is distinctive in the fact that it possessed  a rounded notch in the anterior margin of the maxillary fenestra.

since the animal is very likely fully grown it probably was big headed like Sue, a comparable measurement in Sue would be 149cm according to Hartman's skeletal, scale it down and you get a total length of 10.5m, or we could scale up from big Daspletosaurus torosus like the one Russell (1970) used to make the skeletal in his paper, it's 8.9m with a skull 1.1m long, you get a total length of 10.3m. 11m might be possible but it appears that we have to assume the skull in fully grown Zhuchengtyrannus being proportionally smaller than in other tyrannosaurids. We don't have a whole lot to work with, unfortunately. But, from what we do have i place Zhuchengtyrannus Magnus at 10.5 meters in length and tipping the scales at 4 tons.