some mesostigmatid mites from iran with their world distribution

edaphic mesostigmata are important, because these feed on arthropods and other invertebrates which may affect on natural equilibrium position of oter living micro-organisms. in order to study the fauna of mesostigmatid mites, samples of soil, litter were collected from different parts of esfahan region. mites were extracted by means of berlese funnel, cleared in lactic acid and mounted with hoyer's medium. in this research, the world and iranian distribution of species with some information about their habitats were provided. two genera and 3 species were recorded as new records for iran mite fauna that are marked by an asterisk. the list of identified genera and species is as follows: ascidae: arctoseius cetratus (sellnick, 1940), a. pristinus* karg, 1962, a. venustulus (berlese, 1917), gamasellodes bicolor (berlese, 1918); blattisociidae: lasioseius sugawarai ehara, 1964, l. youcefi athias-henriot, 1959; melicharidae: proctolaelaps pygmaeus (muller, 1860); parholaspididae: proparholaspulus* angustatus* ishikawa, 1987 trachytidae: uroseius* traegardhi* (hirschmann & zirngiebl-nicol, 1969).