Although concluding that it was distinctly different from Oviraptor in both skull and skeleton characters, Barsbold did not include a formal diagnosis for this new taxon. Halszka Osmólska with colleagues in 2004 during their large revision of several dinosaur clades preferred the combination R. mongoliensis over the previously named O. mongoliensis, also regarding the latter as a synonym.
Although identifying it as distinctly different from Oviraptor in both skull and skeletal traits, Barsbold did not provide a formal taxonomic designation for this new species. In 2004, Halszka Osmólska with her colleagues revised several dinosaur groups during their study and chose to use the combination R. mongoliensis instead of the previously named O. mongoliensis, considering the latter as a synonym.