Species: infernalis GALTON, 1995
Etymology: Latin, infernalis, "belonging to the lower regions," an allusion to
the occurrence in the Hell Creek Formation.
Holotype: SDSM 7210
Locality: Olson Locality, SDSM number V729, Harding County, South Dakota.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Left half of cranium, left dentary and fragment of right dentary, centra of 2 dorsal vertebrae, 2 dorsal vertebrae lacking transverse process and neural spines and 2 manual phalanges.
Referred material:
GALTON, 1997
Locality: Lusk, Wyoming.
Horizon: Lance Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
YPM 8098: Right dentary tooth.
FISHER, RUSSELL, STOSKOPF, BARRICK, HAMMER & KUZMITZ, 2000Locality: Harding County, Northwestern South Dakota.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
NCSM 15728: Skull and nearly complete skeleton.
Note: With heart impression?
Note: Peter Galton believes this specimen to be a Bugenasaura and not a new species of Thescelosaurus.
= Thescelosaurus? garbanii MORRIS, 1976
Etymology: In honor of Mr. Harley Garbani, the discover of the specimen.Holotype: LACM 33542
Locality: LACM V 3152, T21N, R42E, NE /2, NW /4, Sec. 22, Garfield County, Montana.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: 5 posterior cervical and 11 anterior dorsal vertebrae, left pes, tarsus, tibia, fibula, and distal part of femur.
Referred material:
TRIEBOLD, 1997
Locality: Sandy Site, Harding County, South Dakota.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
Number: Not given: