Since AMNH 587 was virtually identical to the preserved hand of the Tanycolagreus type specimen, it is now considered to belong to that dinosaur and not to Ornitholestes.
Budući da je AMNH 587 bio praktično identičan očuvanoj ruci tipičnog primjerka Tanycolagreusa, sada se smatra da pripada tom rodu, a ne rodu Ornitholestes.