Species: ostromi GALTON, 1981
Etymology: In honor of Dr. John H. Ostrom.
Holotype: YPM 9150
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: Right fourth metacarpal IV.