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 Presbytis natunae Thomas and Hartert 1894 Presbytis natunae Thomas and Hartert 1894 , Novit. Zool., 1: 652 . Type Locality: Indonesia , North Natuna Isl, Bunguran. Vernacular Names: Natuna Island Surili . Distribution: Bunguran Isl ( Indonesia ). Conservation: CITES – Appendix II. Discussion: Separated from P. siamensis by Groves (2001 c ) .