Genus: Ornithomimus MARSH, 1890
Etymology: Greek, ornith-(ornis), Bird and Greek, mimos, Mimic, Bird mimic.

Species: antiquus (LEIDY, 1865) BAIRD & HORNER, 1979
Etymology:

Referred material:

= Ornithimimus edmontonensis STERNBERG, 1933
Etymology:

NORELL, MAKOVICKY & CURRIE, 2001

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material:

RTMP 95.110.1: Nearly complete skeleton and skull.
Note: Keratinous covering (rhamphotheca) on the beek.