Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China

: Six species of Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia) from Doupengshan are presented, including four species of the genus Torrenticola Piersig, 1896 (T. trigona Gu Guo, sp. nov., T. siamis Pesic Smit, 2009, T. tenuichelicera Gu Guo, 2018 and T. tetraporella Cook, 1967), and two species of the genus Monatractides K. Viets, 1926 (M. hamatapodemus Gu Guo, sp. nov. and M. oxystoma (Viets, 1935)), of which T. siamis is recorded for the Chinese fauna for the first time. Detailed descriptions for the new and newly recorded species and a key to all species of Torrenticolidae so far known from China are provided. Furthermore, the first description is given for the female of T. tenuichelicera.