Genus: Deinonychus OSTROM, 1969
Etymology: Greek, deinos, “terrible” and Greek, onych- (onyx) “claw” + us, Terrible Claw.

Species: antirrhopus OSTROM, 1969

Holotype: YPM 5205

Locality: YPM 64-75, NE 1./4, Sec. 17, T7S, R24E, Carbon County, Montana.

Horizon: Cloverly Formation.


Age: Cashenranchian, Aptian-Albian Stage, middle Gallic subepoch, lower Cretaceous Epoch, Early Cretaceous.

Material: A complete left pes and an incomplete right pes.

Note: MARSALL, BRINKMAN, LAU & BOWMAN, 1998 show that the second pedal digit PII had osteomyelithis.