Synonym: Brachychampsa sealeyi Williamson 1996
Full reference: C. W. Gilmore. 1911. A new fossil alligator from the Hell Creek Beds of Montana. Proceedings of the United States National Museum 41(1860):297-302
- Brachychampsa montana: AMNH-DP 5032, a partial skull (anterior two-thirds of the skull with fragments of the posterior portion). Its type locality is Southeast of Lismas, which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana.
- Brachychampsa sealeyi: NMMNH P-25050, a partial skull (partial skull and associated partial right mandible, partial ramus of the left mandible, and a nearly complete osteoderm).
Ecology: amphibious carnivore