A new species of crested gibbon, from the central Annamite mountain range

Summary Crested gibbons are endemic to the Indochinese bioregion and occur only in Vietnam, Laos, Cambodia and southern China. However, their diversity is not completely understood and the number of recognized species is still under debate. Recent investigations divide crested gibbons into six species, namely Nomascus hainanus, N. nasutus, N. concolor, N. leucogenys, N. sikiand N. gabriellae. However, there is evidence that gibbons in the range of N. sikirepresent two taxa. Based on genetic, acoustic and morphological data, a new gibbon species - Nomascus annamensis- is herein described.