Rinchenia

Rinchenia (named after Byambyn Rinchen) is a genus of oviraptorid dinosaur that lived in Asia during the Late Cretaceous epoch in what is now Mongolia, Nemegt Formation, around 70 million years ago. The type and only known species, Rinchenia mongoliensis, was originally classified as a species within the genus Oviraptor (named Oviraptor mongoliensis), but a subsequent reexamination found differences significant enough to warrant a separate genus. The name Rinchenia was coined for this new genus, though not formally described in detail. During 1984, a nearly complete oviraptorid skeleton was discovered at the Altan Uul II (or Altan Ula II) locality of the highly fossiliferous Nemegt Formation, Gobi Desert. This newly collected specimen, MPC-D 100/32-A, included the skull and lower jaws in their entirety, nearly complete vertebral column, forelimbs with shoulder girdle, and partial hindlimbs with pelvic girdle. Later on, Mongolian paleontologist Rinchen Barsbold in 1986 used the specimen to erect and describe a new species of Oviraptor: Oviraptor mongoliensis. Barsbold in 1997 assigned a new genus for the specimen, namely Rinchenia. 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. In 2018, Gregory F. Funston and team conducted a comprehensive revision of the at-the-time known oviraptorosaur taxa across the Barun Goyot Formation and Nemegt Formation, where they formally described, photographed, and diagnosed Rinchenia based on the assigned holotype MPC-D 100/32-A. The team also stated that even though the locality of the holotype is known, the exact site of discovery and horizon remains unknown.