†Poebrotherium eximium Hay 1902 (even-toed ungulate)
Full reference: O. P. Hay. 1902. Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179:1-868
Belongs to Poebrotherium according to O. P. Hay 1902
Sister taxa: Poebrotherium chadronense, Poebrotherium franki, Poebrotherium wilsoni
Ecology: ground dwelling grazer-browser
Average measurements (in mm): M1 10.5 x 10.5, M2 12.5 x 11.0, M3 14.3 x 11.2, m1 10.5 x 6.5, m2 11.7 x 7.4, m3 16.2 x 7.5