Four new species of torrenticolid water mites with a newly recorded subgenus from Yunnan, China (Acari, Hydrachnidia, Torrenticolidae)

New material of water mites (Acari, Hydrachnidia, Torrenticolidae) from Yunnan Province, Southwestern China is reported. Four new species are described herein: Monatractides (Monatractides) dingi, sp. nov.; Torrenticola (Torrenticola) rectrostrum, sp. nov.; T. (T.) yunnanensis, sp. nov.; T. (Megapalpis) aduncrostrum, sp. nov., of which the last one represents a newly recorded subgenus Megapalpis from China. In addition, a key is provided to the world species of the subgenus Megapalpis.