Genus: Harmodontosaurus NYDEM, 2002
Etymology: Greek, harmos, "shoulder," Greek, odous, "tooth" and Greek, sauros, "lizard": in reference to the shoulder-like anterior expansion of teeth.

Species: emeryensis NYDEM, 2002
Etymology: In reference to Emery County, Utah, where the specimens were found.

Holotype: OMNH 33889

Locality: OMNH locality V868, Emery County, Utah.

Horizon: Mussentuchit Member, Uppermost Cedar Mountain Formation.

Biostratigraphy:

Age: Mussentuchitan age, Uppermost Albian-Lowermost Cenomanian Stage, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material: Right dentary broken posteriorly.

Referred material:

Localities: OMNH locality V868, V. 340,V695, Emery County, Utah.

Horizon: Mussentuchit Member, Uppermost Cedar Mountain Formation.

Biostratigraphy:

Age: Mussentuchitan age, Uppermost Albian-Lowermost Cenomanian Stage, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material:

OMNH 22109: Partial left maxillae.

OMNH 27753, 28067: Partial right dentaries.

OMNH 28068, 32627, 60195: Jaw fragments.