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Arrenurus  is considered one of the most specious genera of water mites. This paper deals with three species of  Arrenurus  Dugès, 1834 (Acari, Hydrachnidiae, Arrenuridae) from Delingha, Qinghai Province, PR China.  Arrenurus  ( Arrenurus )  jaggedis  sp. nov. is new to science;  Arrenurus  ( Arrenurus )  affinis  Koenike, 1887 and  Arrenurus  ( Arrenurus )  turgidus  Koenike, 1911 are recorded for the first time for the Chinese fauna.  Arrenurus  ( Arrenurus )  jaggedis  sp. nov. can be distinguished by the petiole with furrows at the end, lateral ridges jagged, dorsal humps well developed, the top sharp and curved towards the front edge of the body. Detailed descriptions and illustrations of the new and newly recorded species are given in this paper.

Contributions to the knowledge of three species of Arrenurus water mites from Delingha, China with a new species description