Definitions for "Platyrrhini"
( plat-ee-rhine eye)One of two infraorders of suborder Anthropoidea (the other is infraorder Catarrhini, the Old World monkeys, apes, and hominids). Platyrrhines comprise the New World monkeys. Members of this group can be told apart from the catarrhines by their broad nose shape, greater number of premolar teeth, and the fact that several species have prehensile tails.
New World monkeys: capuchin; douroucouli; howler monkey; saki; spider monkey; squirrel monkey; titi; uakari; woolly monkey; marmoset; tamarin
new world monkeys - Callitrichidae (small) and Cebidae (big)