Species: sternbergi GILMORE, 1940
Etymology:

Holotype: USNM 15477

Locality: South Dragon, Manti national Forest, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Nearly complete skull and lower jaws with full dentition, l axis and 3 articulated cervical vertebrae, 15 dorsal 2 sacral, 3 caudal vertebrae, complete pelvis, both femora, right tibia, distal end of
left tibia, fibula, astragalus, calcaneum, many bones of the hand foot and tarsus, humerus, lacking distal end, proximal end of ulna, numerous bones of fore foot, 5th cervical rib, last thoracic rib of right side
and many Incomplete thoracic ribs.

Referred material:

USNM 15559: Left maxillary with teeth, articulated parietal and frontal, right quadrate, right ramus complete and part of left ramus, both with teeth, and skull fragments, 15 presacral vertebrae, right scapula and coracoid, part of left scapula, left clavicle, interclavicle, left humerus and distal half of right humerus, both ulnae, both radii, some carpal and fore-foot bones, fragmentary portions of pelvis, femur lacking proximal end, tibia and numerous pieces of ribs.

USNM 15566: Left quadrate with articulated squamosal, articulated series of 29 vertebrae, greater portion of right scapula and coracoid, right clavicle complete and part of the left clavicle, interclavicle complete left humerus and fragments of right, both ulnae, radius, part of carpus and fore foot, nearly complete left half of pelvis and part of right half, both femora, both tibiae, many tarsal and bones of hind feet, most of the ribs of left side articulated and a few parts of ribs.

USNM 15567: 5 presacral vertebrae, Incomplete tibia, and many fragmentary bones.

USNM 15568: Nearly complete disarticulated skull, both rami, good dentition, axis centrum, 3 cervical, 6 dorsal and 22 articulated caudal vertebrae, right scapula and coracoid and portion of left scapula, right clavicle, interclavicle, left humerus, both ulnae, numerous carpal bones, 1 nearly complete articulated fore foot and numerous elements of the other, articulated pelvis with both hind limbs and feet complete.

USNM 15569: Incomplete lower jaws without teeth, tibia, fibula and a portion of a foot.

USNM 15573: Portion of a maxillary with teeth, fragmentary parts of both scapulae, parts of both humeri, astragalus, calcaneum, several foot bones, and numerous fragments.

USNM 15816: Nearly complete articulated skeleton lacking most of the tail.

USNM 15817: Articulated hinder portion of the skeleton of a very large individual, 7 presacral, 2 sacral and 22 caudal vertebrae in series, pelvis and both hind limbs and feet complete.

USNM 15818: Fragmentary dentary, 8 presacral vertebrae, both humeri, left complete, both radii, and ulna, left scapula and coracoid, left clavicle, both ilia, both ischia, 1 pubis and numerous foot bones.

USNM 15819: Series of 18 articulated vertebrae, 2 sacrals, 9 caudals and 7 presacrals, incomplete ilium, right femur, tibia and a part of a tarsus and foot, left fibula, tibia, tarsus, and part of left hind foot, numerous fragmentary bones.

NYDAM, 1999

OMNH 33460: Incomplete topotypic skeleton.

NYDAM & CIFELLI, 2005

OMNH 61334: Skull and partial skeleton.