There is a monkey in the Congo basin that people who live there have always known and science had not named. It is called the Likweli. As of July 15 it is also called Colobus congoensis [1].
The description is not a single sighting. It rests on 114 field detections across roughly 1,700 square kilometres in and around Lomami National Park, with a mean group size of 6.2 [1] - enough animals, over enough ground, to describe a population rather than an individual.
The authors are John A. Hart, Junior Amboko and Jean-Pierre Kapale of the Lukuru Wildlife Research Foundation, with Kate Detwiler [1].
The part that makes this more than a taxonomic footnote is where it lives. Lomami is a national park - the animal was described inside a protected area, which means the thing that would need to happen next has largely already happened.
One precision: the authors recommend the species be classified as Endangered. The IUCN has not assessed it [1]. That is a recommendation from the people who found it, not a listing - and the difference matters.
