The kipunji was independently discovered by researchers from the Wildlife Conservation Society, the University of Georgia, and Conservation International, in December 2003 and July 2004, making it the first new African monkey species discovered since the sun-tailed monkey in 1984. Originally assigned to the genus Lophocebus, genetic and morphological tests showed that it is more closely related to the baboons (genus Papio) than to the other mangabeys in the genus Lophocebus, and that Lophocebus was diphyletic, meaning that species with differing genealogies have been mistakenly lumped together. Scientists have assigned it to a new genus, Rungwecebus, named after Mount Rungwe, where it is found.