Species: walkerorum JASINSKI, HECKERT, SAILAR, LICHTIG, LUCAS & DODSON, 2022
Etymology: In honor of Greg and susan Walker, who have provided continuous and generous support to numberous students adn researches at the University of Pennsylvania (Earth and Enviromental Science Department).

Holotype: BDM o63

Locality: 1975-BDM-01, Slope County, northwest of Marmarth, North Dakota.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, uppermost Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Incomplete carapace representing the majority of the anterior of the carapace.