Species: cetiformis COPE, 1870
Etymology:
Holotype: AMNH 5688
Locality: 10 miles west of Amell's Creek, Montana.
Horizon: Fox Hills Formation.
Biostratigraphy:
Age: Maastrichtian Stage, uppermost Senonian subepoch, Gulf Epoch, Late Cretaceous.
Material: Cervical, dorsal, caudal centra and fragments of propodials.