Plesiadapis is one of the oldest known primate-like mammal genera which existed about 55-58 million years ago in North America and Europe. Plesiadapis literally means `near-Adapis`, which is a reference to the Eocene lemuriform, Adapis. Plesiadapis tricuspidens, the type specimen, is so named because of the three cusps present on its upper incis.....
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http://en.wikipedia.org/wiki/Plesiadapis
(from the article `primate`) The first known supposed primates date to about 60 million years ago, as complete skulls and partial postcranial skeletons are available for the ...
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http://www.britannica.com/eb/a-z/p/80
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