type species: O. philoceratops Osborn, 1924b
refered species: O. mongoliensis Barsbold, 1986
Geography and Locality: (Djadokhta) the Shabarakh Usu (Bayn Dzak) and Ukhaa Tolgod localities, in Omnogov, Mongolia, and Bayan Mandahu, in Nei Monggol Zizhiqu, People's Republic of China; (Nemegt) the Altan Ula IV locality, Bayankhond, Mongolia.
Age: late Cenonian to late Campanian?.
Geography and Locality: the Shabarakh Usu (Bayn Dzak) and Ukhaa Tolgod localities, in Omnogov, Mongolia, and Bayan Mandahu, in Nei Monggol Zizhiqu, People's Republic of China.
Age: late Cenonian to early Campanian?. [lack of correlative marine or volcanic strata prevents accurate dating, but fauna analysis supports an older age than the Barun Goyot (which underlies the Nemegt) and the Judith River Wedge (Jerzyciewicz et al., 1993).]
AMNH 6508: nest of eggs (Osborn, 1924b). [originally refered to Protoceratops (see Osborn, 1924b; Norell et al., 1994).
IGM 100/36: partial skeleton, lacking skull (Barsbold, 1981).
IGM 100/42: complete skull with partial postcrania (Barsbold, 1981).
IGM 100/971: nearly complete skeleton and partial skull of embryo with shell fragment (Norell et al., 1994).
IGM 100/979: partial skeleton lacking skull: one anterior dorsal centrum, furcula (with hypocleidium?), complete right and left (lacking most of ulna, radius, and humerus) forelimbs with preserved keratinous traces on unguals 2 and 3 of both limbs, proximal ends of scapulae with coracoids, paired sternae with three ventral ribs each, several gastralia, two left probable uncinate processes, distal half of pubes and distal 3/4 of ischia, distal end of right femur, most of right tibia, both fibulae, left astragalus and calcaneum, both pes (right missing proximal 1/8), and nest (Norell et al., 1995; Clark et al., 1999) [originally labelled as "IGM 100/972".]
IGM 199/1002: nearly complete skeleton with skull: includes probable uncinate processes (Clark et al., 1999).
IVPP V9608: nest of eggs and very incomplete skeleton lacking a skull, hindlimb or pelvic elements, and tail (Currie and Dong, 1996).
Geography and Locality: ??
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