AbstractBackgroundThe genusFlagelliphantesSaaristo & Tanasevitch, 1996 was proposed by Saaristo & Tanasevitch, 1996 to accommodate threeex-Lepthyphantesspecies distributed in northern Eurasia. MaleFlagelliphantesare easlily recognised by having a hood-shaped thumb on the embolus. The females have a long, S-shaped scape and the posterior median plate of the epigyne is grossly enlarged (“hypertrophied”).New informationWhile examiningLinyphiidaeBlackwall, 1859 specimens from Yunxia Cave in China’s Jilin Province, we discovered a new cave-dwelling species of the genusFlagelliphantes,F.yunxiasp. n.In this paper, we provide detailed description and photos of its diagnostic somatic and genitalic features. It is the first record of the genus from China.