In 1976 it was renamed Torosaurus utahensis by Douglas Lawson .
Torosaurus utahensis was originally described as Arrhinoceratops utahensis by Charles Whitney Gilmore in 1946 , based on specimen USNM 15583 , a frill fragment from Emery County , Utah .
In 1976 Torosaurus utahensis was renamed Torosaurus utahensis by Douglas Lawson .
Torosaurus utahensis was originally described as Arrhinoceratops utahensis by Charles Whitney Gilmore in 1946 , based on specimen USNM 15583 , a frill fragment from Emery County , Utah .