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When did the Strepsirrhini and Haplorrhini lineages likely separate?

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Illustration comparing the body plans of representative anthropoids, showing a male western lowland gorilla, a male human, a male bonobo, a female Bornean orangutan, and male and female northern white-cheeked gibbons, all labeled and depicted to scale. — primate Representative apes (superfamily Hominoidea).

The Strepsirrhini and Haplorrhini suborders are thought to have separated very early in the evolutionary history of primates, likely occurring approximately 60 million years ago.1