Any South American monkey (platyrrhine) species in either of two families: marmosets (Callitrichidae) or South American monkeys other than marmosets (Cebidae), including capuchins and spider monkeys.

南美洲猴类（阔鼻猴〔platyrrhine〕）的统称，包括狨科和捲尾猴科（如僧帽猴和蜘蛛猴）。