Genus: Thanatotheristes VORIS, THERRIEN, ZELENITSKY & BROWN, 2020
Etymology: From Thanatos, the Greek god of and embodiment of death, and Greek, theristes, "one who reaps or harvests, reaper."

Species: degrootorum VORIS, THERRIEN, ZELENITSKY & BROWN, 2020
Etymology: In honor of John and Sandra De Groot of Hays, Alberta, who discovred the holotype specimen and have been supporive of paleontological resarch in the area.

Holotype: RTMP 2020.5.7

Locality: At the base of a steep cliff on the easter shore of the Bow River approximately 0.5 km upstream of the conflunce with the Oldman River (i.e. The Forks), Taber Manucipality, Alberta Province, Canada.

Horizon: Below the Herronton Sandstone, Foremost Formation, Lower Judith River Group.

Biostratigraphy: Lower Taber Coal Zone?

Age: Judithian age, Lower Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Partial skull: Right maxilla, right jugal, right postorbital, right surangular, right quadrate, right laterosphenoid, left frontal, and both dentaries. Note: Sexually mature individual.

Referred material:

Locality: Twelve Mile Coulee, approximately 20 km northeast of Hays, Taber Manucipality, Alberta Province, Canada.

Horizon: Below the Herronton Sandstone, Foremost Formation, Lower Judith River Group.

Biostratigraphy: Lower Taber Coal Zone?

Age: Judithian age, Lower Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

RTMP 2018.16.1: A partial right maxilla of a subadult individual.