Species: sloani ESTES, 1969
Etymology: In honor of Dr. Robert Sloan, who has done most of the collecting in the Bug Creek area.

Holotype: MCZ 3681

Locality: Bug Creek Anthills locality, SW ¼, Sec.9, Tp.22, R43, McCone County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material: Almost complete left dentary.

Paratype: MCZ 3682: Fragmentary right maxilla.

MCZ 3683: Fragmentary left dentary.

MCZ 3684: 12 fragments of dentaires.

MCZ 3685: 2 parietals.

GAO & FOX, 1997

Topotype: UALVP 29839: Right dentary.

Referred material:

BRYANT, 1990

Locality: Eastern Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

UCMP 130732: Dentary.

UCMP 130733: Dentary.