While the strepsirrhines were diversifying, so too were the haplorrhines. The tarsiers were the first to branch away, around 81 million years ago (more on them in the next slide). The rest of the group (the Simiformes or “simians”) split into two main lineages around 44 million years ago. These were the “flat-nosed” platyrrhines (New World monkeys) and the “narrow-nosed” catarrhines (Old World monkeys and apes).
Image by Nummymuffin (golden lion tamarin)