New World monkeys

As in the case of lemurs, the origin of New World monkeys is unclear. Molecular studies of concatenated nuclear sequences have yielded a widely varying estimated date of divergence between platyrrhines and catarrhines, ranging from 33 to 70 mya, while studies based on mitochondrial sequences produce a narrower range of 35 to 43 mya.[5][27] It is possible that anthropoid primates traversed the Atlantic ocean from Africa to South America during the Eocene by island hopping, facilitated by Atlantic Ocean ridges and a lowered sea level.[18] Alternatively, a single rafting event may explain this transoceanic colonization. Due to continental drift, the Atlantic Ocean was not nearly as wide at the time as it is today.[18] Research suggests that a small 1 kg (2.2 lb) primate could have survived 13 days on a raft of vegetation.[28] Given estimated current and wind speeds, this would have provided enough time to make the voyage between the continents.
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