ammonites
Bunophorus macropternus Cope 1882 (even-toed ungulate)

Mammalia - Artiodactyla - Dichobunidae

Alternative combination: Phenacodus macropternus

Full reference: E. D. Cope. 1882. Contributions to the history of the Vertebrata of the lower Eocene of Wyoming and New Mexico, made during 1881. Proceedings of the American Philosophical Society 20(111):139-197

Belongs to Bunophorus according to R. K. Stucky and L. Krishtalka 1990

Sister taxa: Bunophorus etsagicus, Bunophorus grangeri, Bunophorus pattersoni, Bunophorus robustus, Bunophorus sinclairi

Ecology: ground dwelling herbivore

Average measurements (in mm): M1 5.90 x 7.10, M2 6.50 x 8.10, M3 6.30 x 8.20, m1 6.27 x 5.25