Description of Nilgirius pygoprominulus sp. n. (Opiliones, Assamiidae, Trionyxellinae) from China, with notes on its sexual dimorphism

Background: sp. n. (male and female) in the family Assamiidae from Yunnan Province, China, is described and illustrated herein. Sexual size dimorphism (male larger than female) is inconsistent with most assamiids. Other sexually dimorphic features (body shape, leg IV and pseudonychium) are reported. New information: sp. n. is described as a new species of Trionyxellinae. Information about sexual dimorphism of the species is reported.