The fragmentary azhdarchid in the Nemegt formation, the Mongol Giant.
The fragmentary azhdarchid specimen from the Nemegt nicknamed the Mongol Giant (however no scientific name currently exists). It was described in 2017 and it preserved associated cervical fragments, including a posterior cervical centrum with an estimated width of 198 millimeters.
The measurement compared to other azhdarchids that have their posterior cervical measured of what I could find is Quetzalcoatlus lawsoni, the smaller species of Quetzalcoatlus measured 53.5-53.9 millimeters.
It was estimated through the cervical fragments and it has a wingspan of 10-12 meters, however currently it is fragmentary and just based on the posterior cervical so there is potential for this to be wrong.
It’s also notable because it was the first found pterosaur in the Nemegt formation, suggesting there may be more to cover about this to be found.