Genus: Kawasphenodon APESTEGUIA, 2005
Etymology: From Tehuelchean KAWAS, god of the seas; Greek, sphenos, "wedged" and Greel, odontos, "tooth": In reference to the littoral sedments where it was found.

Species: expectatus APESTEGUIA, 2005
Etymology: Expectatus because, as living today in New Zealand, sphenodontids where expected to occur in Patagonia thorughout the Cretaceous, and this fact prompted the re-examination of the fossil collections focusing on sphenodontids.

Holotype: MACN Pv RN1089

Locality: Estacia 'Los Alamitos', Rio Negro Province, northwestern Patogonia, Argentina.

Horizon: Los Alamitos Formation.

Biostratigraphy:

Age: Late Campanian - Early Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: An incomplete left dentary of an adult.

Referred material:

MACN Pv RN 1099a: Fragment of ?left dentary.

MACN Pv RN1099b: Fragment of ?right dentary.