Two new species and one new record species of genus Arrenurus Duges, 1834 (Acari, Hydrachnidia, Arrenuridae) from China

Three species of the genus Arrenurus Duges, 1834 are described in detail from China, of which Arrenurus (Arrenurus) ancoralis Zheng & Guo sp. nov. and Arrenurus (Arrenurus) unguiculus Zheng & Guo sp. nov. are new to science, and Arrenurus (Truncaturus) isikliensis Boyaci & Ozkan, 2004 is recorded for the first time for the Chinese fauna. Arrenurus (A.) ancoralis can be distinguished by D-3 on big humps and each with a small protrusion bearing D-3 gland; the petiole is well-developed, the middle part contracted, slightly enlarged posteriorly; the ligulate process extending beyond the posterior margin of the petiole and triangle-shaped. Arrenurus (A.) unguiculus can be distinguished by the ligulate process extending beyond the posterior margin for half of petiole length, and nail-shaped. Arrenurus (A.) isikliensis is recorded for the Chinese fauna for the first time. Detailed descriptions and illustrations of the new and the newly recorded species are given in this paper.