Alternative combination: Protogrus nobilis
Full reference: O. C. Marsh. 1872. Notice of some new Tertiary and post-Tertiary birds. The American Journal of Science and Arts, series 3 4(19-24):256-262
Type specimen: Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming
Distribution: found only at Grizzly Buttes
Specimen images are retrieved through the ePANDDA API.
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