Genus: Terminonatator SATO, 2003
Etymology: Latin, terminos, "last" and Latin, natator, "swimmer": in reference to the latest known plesiosaur from this area, gender masculine.

Species: ponteixensis SATO, 2003
Etymology: In reference to the locality near the holotype area Ponteix, Saskatchewan, Canada.

Holotype: RSM P2414.1

Locality: A riverside cliff on the eastern side of Notukeu Creek, Ponteix, 49°46’20”N, 107°26’20”W, southwestern Saskatchewan Province, Canada.

Horizon: Bearpaw Formation.

Biostratigraphy: Either Baculites cuneatus or Baculites reesidei zone.

Age: Upper Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Skull partly disarticulated vertebral column, incomplete pectoral and pelvic girdles, fore- and hind limbs, disarticulated ribs and gastralia and gastroloths.

 

Terminonatator ponteixensis RSM P2414.1 skull in A) right and B) left lateral views (modifed from SATO, 2003).

Terminonatator ponteixensis RSM P2414.1 right lateral skull. A) mouth closed and B) mouth open (modifed from SATO, 2003).