The most distinctive feature of ape dentition, which clearly distinguishes apes from Old World monkeys, is:

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The Y-5 molar pattern is the most distinctive feature of ape dentition and differentiates them from Old World monkeys, which have bilophodont molars. The Y-5 pattern involves five cusps arranged in a Y-shape on the surface of the molars, whereas bilophodont molars have four cusps arranged in two parallel ridges. The 2-1-2-3 dental formula is common to both apes and Old World monkeys, and a long canine tooth is present in some but not all ape species, and is not exclusive to males.

The Most Distinctive Feature of Ape Dentition, Which Clearly Distinguishes