By investigating watermite collections from Guizhou province, China in 2006, three new Unionicola species are described: Unionicola (Unionicola) maolanensis sp. nov., Unionicola (Unionicola) xishuiensis sp. nov. and Unionicola (Unionicola) suiyangensis sp. nov.. A key is presented for the hitherto known five Chinese Unionicola species of the subgenus based on males and females.
Keywords: Water Mites, Taxonomy, Chinese Fauna, Oriental Region, Key on Chinese Unionicola, Acari.