Researchers say a 25 million-year-old tooth found in a riverbed in Tanzania from the oldest member of the primate group of Old World monkeys provides a clue to when apes and monkeys first diverged from their common ancestor. The tooth -- from the newly discovered species Nsungwepithecus gunnelli, the oldest-known example of the primate group cercopithecoids -- shows differences from a jawbone from another newly found species, Rukwapithecus fleaglei, an early member of hominoids.

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