Origin and diversification of primates through geologic time
The evolutionary history of the primates can be traced back 57-90 million years.[1] One of the oldest known primate-like mammal species, Plesiadapis, came from North America;[2] another, Archicebus, came from China.[3] Other similar basal primates were widespread in Eurasia and Africa during the tropical conditions of the Paleocene and Eocene.
Purgatorius is the genus of the four extinct species believed to be the earliest example of a primate or a proto-primate, a primatomorph precursor to the Plesiadapiformes, dating to as old as 66 million years ago.
Tavaré, Simon; Marshall, Charles R.; Will, Oliver; et al. (April 18, 2002). "Using the fossil record to estimate the age of the last common ancestor of extant primates". Nature. 416 (6882). London: Nature Publishing Group: 726–729. Bibcode:2002Natur.416..726T. doi:10.1038/416726a. PMID11961552.
^Rose, Kenneth D. (1994). "The earliest primates". Evolutionary Anthropology: Issues, News, and Reviews. 3 (5). Hoboken, NJ: John Wiley & Sons: 159–173. doi:10.1002/evan.1360030505.
Fleagle, John; Gilbert, Chris (2011). Rowe, Noel; Myers, Marc (eds.). "Primate Evolution". All The World's Primates. Charlestown, RI: Primate Conservation, Inc. Retrieved 2015-04-27.