Species: mirificus OSMOLOSKA & RONIEWICZ, 1970
Etymology:
Holotype: ZPAL MgD-I/6
Locality: Altan Ula III, Nemegt Basin, Ömnögov (South Gobi), Mongolia.
Horizon: Upper Nemegt Formation.
Biostratigraphy: Tarbosaurus bataar, Saurolophus angustirsotris and Dyoplosaurus giganteus Zone.
Age: Late Campanian or Early Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Shoulder girdle and fore limbs, fragmentary vertebrae and ribs.
Note: Palaeopathologies, left manual phalanges III-1 and III-2 bear pits, presumably
from an injury to the joint between them.