Diversity of Mesostigmatid edaphic mites in Pardis of Urmia University

In order to identifying and to determine the abundance and diversity of edaphic mites, regular and random sampling from various depths of soil up to 25 cm from March 2014 to February 2015 took place at the area of Urmia University. The number of species and number of individuals per species were recorded according to sampling time. With this data, Diversity indexes, Species richness and Domination class were calculated. In this research, 13 species from 12 genera belonging to 7 Families were collected and identified, among them Rhodacarus epigynialis Sheals (Rhodacaridae) and Urodiaspis sp. (Urodinychidae) were new records for West-Azerbaijan Province and six species include Androlaelaps casalis Berlese (Lealapidae), Cosmolaelaps lutegiensis Shcherbek (Lealapidae), Pachylaelaps resinae Karg (Pachylaelapidae), Amblyseius meridionalis Berlese (Phytoseiidae), Typhlodromus bagdasarjani Wainstein and Arutunjan (Phytoseiidae), Parasitus hyalinus Willmann (Parasitidae) were new records for urmia City. The Shannon-Wiener’s diversity index which is affected by species richness and increase in the number of species community, ranging between zero to 1.78, (variability rang) and was the highest variety in June and lowest in winter. Simpson dominance index, extremely dependent on relative abundance of dominant species in the sample and in this study ranges from 0.357 to zero which related to September and the winter respectively. The dominant species, P. resinea of the family Pachylaelapidae with 24.24 percent is the most frequent and species R. epigynialis, Euseiues sp. , Urodiaspis sp. have the least abundant in this study.