Species: langstoni ERICKSON, 1972
Etymology: In honor of Wann Langston Jr.
Type: SMM P67.15.3
Locality: About 500 m from the Eastern boundary of the Park, Sec. 12, T. 21, R. 9, W4, Dinosaur Provincial Park, Newell County, Alberta Province, Canada.
Horizon: Dinosaur Park Formation, upper Judith River Group.
Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.