Genus: Tchoiria EFIMOV, 1975

Species: namsarai EFIMOV, 1975

Type: PIN 3386/1-19

Locality: 60 km south west of Choir, in the Middle Gobi Aimag Hüren Dukh (Khuren Dukh), Dundgov Aimak (Middle Gobi), Southeastern Mongolia

Horizon: Dzun-Bayin Formation, Huhteeg Gorizont, Zuubayan Svita.


Age: Aptian/Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.
Note: Large lake deposit.

Material: Skull missing anterior tip, posterior end and posterior end of table of the skull, dentary, and cervical rib.

Referred material:

PIN 3386/1-2: Cervical centrum.

PIN 3386/1-10: Humerus.

PIN 3386/1-11: Interclavicle and clavicle.

PIN 3386/1-12: Clavicle.

PIN 3386/1-13: Scapula.

PIN 3386/1-16: Coracoid.

PIN 3386/1-22, 3386/1-21: Rib.


Field number 960721 KD TSGT (HMNS 1996-12-6): Partial skeleton.


Species: klauseni KSEPKA, GAO & NORELL, 2005
Etymology: In honor of James Klausen, the preparator of the holotype, in recognition of years of dedicated volunteer service to the American Museum of Natural History.
= Tchoiria nova KSEPKA, GAO & NORELL, 2003

Holotype: IGM 1/8

Locality: Two Volcanoes, 43°49.503'N, 99°19.546'E, Dhous, Bayanhongor, Mongolia.



Age: Aptian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: An incomplete skull and partial disarticulated postcranial skeleton. The following elements are preserved: A skull nearly complete on the right side and fragmentary on the left, missing the tip of the snout and distored in the braincase region, partial right dentary and splenial in articulation, 5 cervical, 6 dorsal, 3 sacral and 4 caudal vertebrae or vertebral elements, several ribs and gastralia, right coracoid, fragment of scapular blade, right radius, right ulna, right ilium, partial right ischium, partial right pubis and right femur.