Genus: Unktaheela CLARK, O’KEEFE & STACK, 2024
Etymology: Named after the keen-eyed, horned water serpent of the Native American Lakota people.

Species: specta CLARK, O’KEEFE & STACK, 2024
Etymology: Latin, spectare, "to see"; in reference to the unique orbital morphology and visual adaptations of this species.

Holotype: UCM 35059

Locality: UCM Locality 78160, 8.5 miles east of Red Bird, 43°17'05"N, 104°07'47.5"W, Niobrara County, Wyoming.

Horizon: Sharon Springs Formation, Pierre Shale.

Biostratigraphy: Baculites obtusus zone.

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

Material: Cranium and mandible, dorsal series, ribs, portions of the pelvic and pectoral girdles, both ilia, both fore-paddles and both hind-paddles.

Skull after CLARK, O'KEEFE & SLACK, 2024; A) Dorsal; B) Lateral and C) Ventral views.

 

Paratype: SDSM 142501

Locality: 5.4 miles south of Bufflo Gap, 43°24'4.57"N, 103°18'43.2"W, Fall River County, South Dakota.

Horizon: Sharon Springs Formation, Pierre Shale.

Biostratigraphy: Baculites obtusus zone.

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

Material: Complete cranium, mandible in three pieces, adn 5 small, fragmentary, unidentified postcranial elements.