Erethizon

1. infraorbital foramen exceeding foramen magnum in size
2. upper cheek teeth tilted to outside, lower teeth tilted inwardly
3. toothrows converge anteriorly
4. nasals tapered posteriorly, terminating well behind premaxilla at midorbit
5. paroccipital processes small, vertical and terminating above level of bottom of bullae
6. angular process arising at level of M₂
7. large coronoid process
8. depression between orbits
9. 20 teeth (DF = 1/1, 0/0, 1/1, 3/3)