Species: clemensi BRODKORB, 1963
Etymology: In honor of Bill Clemmens.
Holotype: UCMP 53958
Locality: UCMP V-5620, Lull Quarry, near the head of a tributary of Buck Creek, Powder River Basin, Niobrara County (Formerly Converse County), Wyoming.
Horizon: Upper Lance Formation.
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Distal portion of a right humerus.