There exist 17 genera and over 70 species of Platyrrhines new world monkeys of South and Central America nowadays. Up to a few years ago, there was a big box covering all monkeys from the Caribbean and South America, but in this time, more information has been found in regards of the evolutionary history of these monkeys. There are many theories revolving around the evolution in Spider monkeys. According to one theory, the spider monkeys are believed to be closely related to the woolly spider monkeys. They are believed to have split from the woolly monkeys in the South American lowland forest, and evolved their unique locomotory system. But fossils of spider monkeys living in Cuba in recent times have been found.