Genus: Mercuriceratops RYAN, EVANS, CURRIE & LOEWEN, 2014
Etymology: In reference to winged helmet of the Roman messenger god Mercury, and Greek, ceratops, "horned face", a common suffix for genera of ceratopsid dinosaurs.
CURRIE & LOEWEN,
Etymology: Gemini, from mythology, the twins Castor and Pollux were transformed into the constellation Gemini, referrng to the twin specimens from Alberta and Montana.
Holotype: ROM 64222
Locality: Fergus County, SW 1/4 Sec 9, T22N R21E, Montana. (detailed locality data on file at the Royal Ontarior Museum).
Horizon: Judith River Formation.
Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.
Material: An almost complete right squamosal.
Mercuriceratops gemini (after RYAN, EVANS, CURRIE & LOEWEN, 2014), Holotype: ROM 64222.
Locality: North side of the Red Deer River, approximately 1 km east of 'Happy Jack's Cabin', 12 U0471467, 5624176, Dinosaur Provincial Park, Newell County, Alberta Province, Canada.
Horizon: Lower Dinosaur Park Formation (approximately 2 m above the contact with the Oldman Formation), upper Judith River Group.
Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.
UALVP 54559: Incomplete right squamosal.