Species: jeffei NORELL, MAKOVICKY, & CLARK 2000
Etymology: In honor of Byron Jeffe in recognition of his family’s support for the Mongolian Academy of Sciences-American Museum of Natural History Paleontological expeditions.

Holotype: IGM 100/983

Locality: Ukhaa Tolgod, near the salt extraction settlement of Daus, northeastern Nemegt Basin, Gurvan Tes Somon, Ömnögov (South Gobi), Mongolia.

Horizon: Djadokhta Formation or the Barun Goyot Formation.

Biostratigraphy:

Age: Middle Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Almost complete skeleton including a fragmentary skull missing the posterior end, axis, 2 anterior cervical vertebrae, dorsal vertebrae, sacral vertebra and 4 caudal vertebrae, part of the femoral shaft, the knee, distal end of metatarsal III, and 3 phalanges.

Referred material:

Locality: Bolor’s Hill, approximately 5 km away from the main Ukhaa Tolgod, near the salt extraction settlement of Daus, northeastern Nemegt Basin, Gurvan Tes Somon, Ömnögov (South Gobi), Mongolia.

Horizon: Djadokhta Formation or the Barun Goyot Formation.

Biostratigraphy:

Age: Middle Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

IGM 100/984: Fragmentary rostrum, including a secondary bone palate formed by both the premaxillary and maxillary shelves and the vomer.

BEVER & NORELL, 2009

 

Locality: Xanadu, Ukhaa Tolgod, near the salt extraction settlement of Daus, northeastern Nemegt Basin, Gurvan Tes Somon, Ömnögov (South Gobi), Mongolia.

Horizon: Djadokhta Formation or the Barun Goyot Formation.

Biostratigraphy:

Age: Middle Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

IGM 100/972: Fragmentary skull of a perinate.

IGM 100/974: Fragmentary skull of a perinate.