Genus: Polythorax COPE, 1876 (nomen dubium)
Etymology:

Genus: missuriensis COPE, 1876 (nomen dubium)
Etymology:

Holotype:

Locality: Judith River Basin, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Plastron and fragmentary carapace.