The main modifications include a decrease in the number of teeth and an expansion of the molars' cusp pattern.
Heterodonty is a primitive feature because primates have diverged from the basic pattern less than most mammals. The two main changes are a reduction in the number of teeth and an expansion of the cusp pattern on the molars.
Prosimians and anthropoids are the two categories used to categorize primates. During the Oligocene Epoch, prosimians gave rise to monkeys. African catarrhines gave rise to apes during the Miocene epoch. Lesser and bigger a apes re the two categories of apes.
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