Genus: Rubeosaurus McDONALD & HORNER, 2010
= Genus: Nova McDONALD & HORNER, 2007
Etymology: Latin, rubes, adjective "thornbush or bramble" and Latinized Greek noun, saurus, "lizard"; Thornbush lizard, in reference to the array of spikes adorning the parietals.

Species: ovatus (GILMORE, 1930) McDONALD & HORNER, 2010
= Styracosaurus ovatus GILMORE, 1930
Etymology: Latin, ovatus, "oval."
= Taxon A* Similar to Styracosaurus HORNER, VARRICCHIO & GOODWIN, 1992

Holotype: USNM 11869

Locality: T37N, R8W, Milk River, Blackfeet Indian Reservation, Glacier County, Montana.

Horizon: Two Medicine Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Posterior portion of frill and numerous fragments.

Holotype USNM 11869.

Referred material:

GILMORE, 1939

Locality: South Side of Milk River, Vicinity of Landslide Butte on Blackfeet Nation, Glacer County, Montana.

Horizon: Two Medicine Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

USNM 14765: Right half of frill lacking the squamosal, articulated left postorbital, jugal, postfrontal and prefrontal, lachrymal and supraorbital, right maxillary containing several teeth, left premaxillary, rostal, a portion of the right half of the nasal horn core, fragment of the basioccipital, unidentified skull fragments, both femora, left scapula, first rib, one dorsal vertebra, and two phalangeial bones. An adult.

McDONALD & HORNER, 2007

Locality: Canyon Bonebed (CBB), Landslide Butte Field Area, approximately 42 km northwest of Cut Bank, Glacier County, Montana.

Horizon: Two Medicine Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

MOR 492: Partial skull, including fused left and right nasals, a partial left premaxilla, a partial left postorbital, a partial right parietal and 2 parietal spikes.