Enterobius (Colobenterobius) serratus sp. nov. (Nematoda: Oxyuridae) from the Proboscis Monkey, Nasalis larvatus (Wurmb, 1787) (Primates: Cercopithecidae: Colobinae), in Sarawak, Borneo, Malaysia

Enterobius (Colobenterobius) serratus sp. nov. (Nematoda: Oxyuridae) is described from females collected from a proboscis monkey, Nasalis larvatus (Primates: Cercopithecidae: Colobinae), in Sarawak, Borneo, Malaysia. This species is readily distinguished from other members of the subgenus by the serrated inner margins of lips, lamellated superstructures of the esophageal teeth forming denticles, larger body, and larger eggs.