; cohort Unguiculata, order Primates)
Although the platyrrhine (S. American) monkeys are often grouped with the catarrhine (Old World) monkeys, apes, and humans into one suborder, Anthropoidea (or Simiiformes), the two kinds of monkeys remain distinct as far back as the Oligocene, when they first enter the fossil record. Much of their resemblance is therefore the result of parallel evolution. Compare Catarrhini.
Subjects: Zoology and Animal Sciences.