The premolars were absent in all species other than A. kenyensis. On the upper molars, the posterior pretrite central conules were reduced, as were the anterior pretrite central conules on the lower molars. The pretrite and posttrite half-loph(id)s were dislocated from each other, resulting in the successive loph(id)s exhibiting an alternating pattern.
The absence of premolars in A. kenyensis is a key feature.  The upper molars have reduced central conules, while the lower molars also show reduced anterior pretrite central conules. The dislocation of the half-loph(id)s creates an alternating pattern of loph(id)s.