Mites in the family Pseudocheylidae are considered members of the Anystoidea, which comprises the families Anystidae, Teneriffiidae and Pseudocheylidae. They have an elliptical body, reddish orange in colour, lacking genital papillae, widely separated coxal fields I II and III IV, with short raptorial palps, characteristically annulated, stalk-like pretarsi with membranous pad-like empodia. They have been found under tree bark, in litter and nests, on moss and sometimes in soil and thought to be predators in these habitats. This family includes 22 species of three valid genera: Pseudocheylus Berlese, 1888 (with two species); Anoplocheylus Berlese, 1910 (with 17 species), and Neocheylus Trägårdh, 1906 (with three species). The genus Anoplocheylus is the largest in t e family with 17 species worldwide of which four species described from Iran. For identification of mite fauna of this mites in East Azerbaijan province of Iran, samplings were taken from soil, barks, moss and litters in orchards and crop fields during 2023-2024. Mites were extracted using Berlese- Tullgren funnels, preserved in 70% ethanol, cleared in Nesbitt's fluid and were mounted on microscope slides using Hoyer's medium. In this study, seven species belonging to the genus Anoplocheylus including adults and immature stages (first time) were collected and identified. Of which one species was new to Iranian fauna and marked with one asterisk (*). Anoplocheylus: Anoplocheylus malayeriensis Ueckermann & Khanjani, 2004 ( A. tauricus Livshitz & Mitrofanov, 1973 ( A. kazemii TN); A. marivaniensis Khanjani et al. (PN); A. sinai Bagheri ( A. bonabjadidiensis Navaei-bonab ( ); A. aegypticus* Baker & Atyeo,1964
