PaleoDB taxon number: 335120
Alternative combination: Protogrus marshi
Full reference: R. W. Shufeldt. 1915. Fossil birds in the Marsh Collection of Yale University. Transactions of the Connecticut Academy of Arts and Sciences 19:1-110
Type specimen: YPM 888, a limb element. Its type locality is Henry's Fork, which is in an Eocene terrestrial horizon in the Bridger Formation of Wyoming.
Ecology: ground dwelling carnivore