Haplorrhini
Quick Summary
Haplorrhini is one of the two suborders of primates, distinguished from the other suborder, Strepsirrhini. Haplorrhini includes tarsiers, monkeys, apes, and humans. A key difference lies in their noses; haplorrhines have noses covered with hair, unlike the moist, bare muzzles of strepsirrhines.1
Haplorrhines also possess a fovea, an area of enhanced vision, whereas strepsirrhines have a tapetum lucidum, a reflective layer that aids night vision. Furthermore, haplorrhines have a hemochorial placenta, requiring shedding if pregnancy doesn't occur, while strepsirrhines have a less intimate epitheliochorial placenta and do not menstruate. This suborder diverged early in primate evolution, possibly around 60 million years ago.1
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