PaleoDB taxon number: 47838
Full reference: M. R. Dawson, R. K. Stucky, L. Krishtalka and C. C. Black. 1986. Machaeroides simpsoni, new species, oldest known sabertooth creodont (Mammalia), of the Lost Cabin Eocene. Contributions to Geology, University of Wyoming, Special Paper 3:177-182
Sister taxon: Machaeroides eothen
Type specimen: CM 45115, a partial skull (fragments of a skull includin4 parts of the palate, with incisors, canines, right P1-M2 and left P4-M2). Its type locality is K-7W, which is in a Lostcabinian terrestrial horizon in the Wind River Formation of Wyoming.
Ecology: ground dwelling carnivore
Average measurements (in mm): P4 9.30 x 7.60, M1 9.40 x 11.20, M2 3.70 x 10.50, p4 8.00 x 3.50