>> 6. Metacarpal-phalangeal joint, maximum extension 15f or less (metacarpal >> distal extensor pits absent), above the horizontal. > >If only I had theropod manual phalanges to experiment with... I just looked this up; Barsbold, 1976 fig. 7 has a dorsal view of the Therizinosaurus metacarpus, which appears to possess a typical theropod dorsal "extensor pit".