Species: gracilis LONGRICH, BHULLAR & GAUTHIER, 2013a
Etymology: Latin, gracilis, "slender."
Holotype: UCMP 128873
Locality: UCMP V74116, Baldy Butte SW-Top Level, Garfield County, Montana.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Right dentary.
Referred material:
Locality: UW 81013, Hewitt's Foresight One, Bighorn Basin, Park County, Wyoming.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UW 44954: Partial dentary.