The discovery of Rungwecebus kipunji was announced in 2005 and placed in its own genus in 2006 (see here for some of the details). Now it is being placed on the endangered species list. Science Daily has the details:
The population estimate [of 1,117 individuals - afarensis] was the result of more than 2,800 hours of field work by WCS scientists in the Southern Highlands and Udzungwa Mountains in Tanzania where the kipunji was discovered. The team found that the monkey’s range is restricted to just 6.82 square miles (17.69 square kilometers) of forest in two isolated regions.
The authors also discovered that much of the monkey’s remaining habitat is severely degraded by illegal logging and land conversion. In addition, the monkey itself is the target of poachers. Because of these combined threats, WCS proposes that the kipunji should be classified by the World Conservation Union (IUCN) as “critically endangered” – which means it is threatened with extinction in the wild if immediate conservation action is not taken.