Genus: Comotherium PROTHERO, 1981
Etymology: In reference to Quarry Nine, Como Bluff, Wyoming and Greek, theron, “beast, mammal”: Como beast.

Species: richi PROTHERO, 1981

Holotype: AMNH 101132

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Left maxillary fragment with 3 molars.

Referred material:

AMNH 104826: Right upper molar.