The monkey also goes by the Malay name monyet belanda ("Dutch monkey"), or even orang belanda ("Dutchman"), as Indonesians remarked that the Dutch colonisers often had a similarly large belly and nose.
This species of monkey is easily identifiable because of its unusually large nose.
TaxonomyProboscis monkeys belong to the Colobinae subfamily of the Old World monkeys. There are two subspecies:
- Nasalis larvatus larvatus (Wurmb, 1787), which occupies the whole range of the species;
- Nasalis larvatus orientalis (Chasen, 1940), restricted to north-east Kalimantan.