Mangabeys are West African Old World monkeys, with species in three of the six genera of tribe Papionini. 
The more typical representatives of "Cercocebus", also known as the white-eyelid mangabeys, are characterized by their bare, upper eyelids, which are lighter than their facial skin colouring, and the uniformly coloured hairs of their fur. Members of "Lophocebus", the crested mangabeys, tend to have dark skin, eyelids that match their facial skin, and crests of hair on their heads.
A new species, the highland mangabey, was discovered in 2003 and was initially placed in "Lophocebus". The genus "Rungwecebus" was later created for this species.
"Lophocebus" and "Cercocebus" were once thought to be very closely related, so much so that all the species were in one genus, but the species within genus "Lophocebus" are now thought to be more closely related to the baboons in genus "Papio", while the species within genus "Cercocebus" are more closely related to the mandrill.
Genera.
The three genera of mangabeys are:
References.
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