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Unformatted text preview: Primates to Human Beings A group of small, nocturnal and arboreal, insect-eating mammals called the Euarchonta begins a speciation that will lead to the primate, tree shrew and flying lemur orders. 65-85 M.A. The Primatomorpha is a subdivision of Euarchonta that includes the primates and the proto-primate Plesiadapiformes . One of the early proto-primates is Plesiadapis . Plesiadapis still had claws and the eyes located on each side of the head. Because of this they were faster on the ground than on the top of the trees, but they began to spend long times on lower branches of trees, feeding on fruits and leaves . The Plesiadapiformes very likely contain the species which is the ancestor of all primates.  One of the last Plesiadapiformes is Carpolestes simpsoni . It had grasping digits but no forward facing eyes. 30 M.A. New World monkeys, have prehensile tails and males are color blind. They may have migrated to South America on a raft of vegetation across the Atlantic ocean (circa 4,500 km, 2,800 mi). Catarrhines mostly stayed in Africa as the two continents drifted apart. One ancestor of catarrhines might be Aegyptopithecus . 7 M.A. Hominina speciate from the ancestors of the chimpanzees . The latest common ancestor lived around the time of Sahelanthropus tchadensis , ca. 7 Ma  ; S....
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