Species: magnus WILSON, 1987
Etymology:
Holotype: SDSM 13033
Locality: SDSM V701, Red Owl Quarry, 3 miles north and 1 mile east of Red Owl, Meade County, South Dakota.
Horizon: Fox Hills Formation.
Biostratigraphy:
Age: Maastrichtian Stage, uppermost Senonian subepoch, Gulf Epoch, Late Cretaceous.
Material: Left m1.