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There are at least 145 living species of the suborder Anthropoidea . Over 90% of them are monkeys. The remaining species are apes and humans. The anthropoids (members of the suborder Anthropoidea) have been the most successful primates in populating the earth. They are generally larger, more intelligent, and have more highly developed eyes than the prosimians.

There are two distinct infraorders of Anthropoidea that have been evolving independent of each other for at least 30,000,000 years. They are the Platyrrhini (New World monkeys) and the Catarrhini (Old World monkeys, apes, and humans). These two diverse groups of species can be distinguished from each other most easily based on the form of their noses and by the number of specific types of teeth.

The platyrrhine nose (on the left below) is relatively flat with somewhat sideways projecting nostrils separated by a wide septum. In contrast, the catarrhine nose (on the right below) has more downward projecting......

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Approximate Pages: 3 (250 words per double-spaced page)

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