A new cave-dwelling species of Hahnia C. L. Koch, 1841 from Guizhou Province, China (Araneae, Hahniidae).

Background: Hahnia, the most species-diversity genus of the comb-tailed spider family Hahniidae Bertkau, 1878, compromises 102 species distributed worldwide. To date, 24 species have been recorded from China. New information: A new species of the genus Hahnia C. L. Koch, 1841 is described, based on both sexes from Shanyang Cave of Guizhou Province, China and is named H.jiangkou sp. nov. Diagnostic photos of habitus and copulatory organs, as well as a distributional map, are provided.