A further drawback of the Ethnologue and INALI classifications is the lack of lower-level subgroups beyond the two-way division into Totonac and Tepehua. In the Totonac branch of the family, Misantla is the most distinctive, and the remaining languages form a more closely related group . Divisions amongst the latter group, which might be referred to as "Central Totonac," are unclear, though most researchers agree that there is at least a three-way division between Northern, Southern/Sierra, and Lowland/Coastal varieties (; ; ). Recent efforts at reconstruction and evidence from lexical similarity further suggest that Southern/Sierra and Lowland group together against Northern , although this is still uncertain, pending more exhaustive investigation. The most recent proposal for the family is as follows (; ):