Genus: Sinornithomimus KOBAYASHI & LU, 2003
Etymology: Latin, sinae, refers to occurrence in China; Greek, ornithos, ‘bird’, and Greek, mimus, ‘mimic’.

Species: dongi KOBAYASHI & LU, 2003
Etymology: In honor of Professor Zhi-Ming Dong, who discovered these skeletons and made great contributions to the Mongol Highland Internatinoal Dinosaur Project.
= Genus Nova KOBAYASHI, LU, DONG, BARSBOLD, AZUMA & TOMIDA, 1999, KOBAYASHI, LU, AZUMA, DONG, & BARSBOLD, 2001

Holotype: IVPP-V11797

Locality: Near Ulan Suhai, Alashanzuo Banner, 41°17’10”N, 103°52’38”W, Inner Mongolia (Nei Mongol), China.

Horizon: Ulansuhai Formation.

Biostratigraphy:

Age: Cenomanian stage?, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material: A nearly complete skeleton of a subadult.
Note: Found with gastroliths.

Breakdown as follows;

IVPP-V1197-10: Skull and cervicals of an adult.

IVPP-V1197-11: Skull and skeleton.

IVPP-V1197-12: Skull and fragmentary skeleton.

IVPP-V1197-13: Skull and skeleton of juveniles.

IVPP-V1197-14: Skull and skeleton of juvenile.

IVPP-V1197-15: Fragmentary skeleton of a juvenile.