Order Primates Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 111 184 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Nomascus concolor subsp. nasutus Kunkel d’Herculais 1884 Discussion: Status of nasutus is unclear; it may be a senior synonym for hainanus .