Species: ? bexelli (BOHLIN, 1953) OLSHEVSKY, 1978 (nomen dubium)
Etymology:
= Troodon bexelli BOHLIN, 1953 (nomen dubium)
= Stegoceras bexelli (BOHLIN, 1953) KUHN,
1964 (nomen dubium)
Holotype:
Locality: Tsondolein-khuduk, Ordos (Shaan-Gan-Ning) Basin, Inner Mongolia (Nei Mongolia), China.
Horizon: Tsondolein Khuduk Beds.
Biostratigraphy:
Age: Campanian-Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Fragmentary parietal.
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Species: gilmorei MARYANSKA & OSMOLSKA, 1974
Etymology: In honor of Charles W. Gilmore, who first gave the detailed description
of a pachycephalosaurid species.
Holotype: Z. Pal. No. MgD-I/105
Locality: Khulsan, Nemegt basin, Ömnögov (South Gobi), Mongolia.
Horizon: Barun Goyot Formation.
Biostratigraphy: Djadochtatherium catopsaloides KIELAN-JAWOROWSKA, Nemegtbaatar gobiensis KIELAN-JAWOROWSKA, and Chulsanbaatar vulgairs KIELAN-JAWOROWSKA Zone.
Age: Middle –Late Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Damaged skull with several maxillary teeth, lacking braincase, palate and anterior portion of snout, mandible with several mandibular teeth, lacking anterior portion of dentary, as well as articular and prearticular.