Pronunciation: ROO-bee-o-SOR-us Meaning: Thornbush (bramble) lizard Author/s: McDonald and Horner (2010) Synonyms: Styracosaurus ovatus First Discovery: Montana, USA Chart Position: 573
(Ovate thornbush lizard) EtymologyRubeosaurus is derived from the Latin "rubeus" (thornbush or bramble, aka blackberry bush) and the Greek "sauros" (lizard), named for the array of spikes adorning its frill. The species epithet, ovatus, means "egg-shaped" in Latin. The name was coined by American paleontologist and Herman Munster look-a-like Charles Whitney Gilmore in 1930 for the shape of its frill.
DiscoveryThe remains of Rubeosaurus were discovered on a Blackfoot Indian Reservation in the upper Two Medicine Formation at Milk River, Glacier County, Montana, by George F. Sternberg in 1928.
The holotype (USNM 11869) is a partial frill (parietal) which Gilmore named as a second species of Styracosaurus—Styracosaurus ovatus, and for years it caused problems, coasting between valid and not so from paleontologist to paleontologist. The discovery of a partial skull (MOR 492) in 1986 convinced McDonald and Horner that Rubeosaurus was a distinct critter, closer to Einiosaurus than to Styracosaurus.