Which primates are included among New World monkeys?

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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).

New World monkeys, scientifically classified as platyrrhines, are a group of primates native to tropical regions of South and Central America. They are distinguished from Old World monkeys by their broad noses with outwardly directed nostrils and the lack of ischial callosities (sitting pads).12

The group comprises five families, which include the following primates:

Callitrichidae: Includes marmosets and tamarins.12
Cebidae: Includes capuchins and squirrel monkeys.23
Aotidae: Includes durukulis, also known as night monkeys.2
Pitheciidae: Includes sakis, uakaris, and titis.12
Atelidae: Includes spider monkeys, woolly monkeys, woolly spider monkeys, and howler monkeys.12

Some of these species are notable for having prehensile tails, an ability not found in Old World monkeys.1